module

ComSndFTP v1.3.7 Beta USER Format String (Write4) Vulnerability

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Disclosed
Jun 8, 2012
Created
May 30, 2018

Description

This module exploits the ComSndFTP FTP Server version 1.3.7 beta by sending a specially
crafted format string specifier as a username. The crafted username is sent to the server to
overwrite the hardcoded function pointer from Ws2_32.dll!WSACleanup. Once this function pointer
is triggered, the code bypasses dep and then repairs the pointer to execute arbitrary code.
The SEH exit function is preferred so that the administrators are not left with an unhandled
exception message. When using the meterpreter payload, the process will never die, allowing
for continuous exploitation.

Authors

ChaoYi Huang ChaoYi.Huang@connect.polyu.hk
rick2600 rick2600@corelan.be
mr_me mr_me@corelan.be
corelanc0d3r peter.ve@corelan.be

Platform

Windows

Architectures

x86

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':


    msf > use exploit/windows/ftp/comsnd_ftpd_fmtstr
    msf exploit(comsnd_ftpd_fmtstr) > show targets
        ...targets...
    msf exploit(comsnd_ftpd_fmtstr) > set TARGET < target-id >
    msf exploit(comsnd_ftpd_fmtstr) > show options
        ...show and set options...
    msf exploit(comsnd_ftpd_fmtstr) > exploit
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