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tnftp "savefile" Arbitrary Command Execution

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tnftp "savefile" Arbitrary Command Execution

Disclosed
10/28/2014
Created
06/14/2018

Description

This module exploits an arbitrary command execution vulnerability in tnftp's handling of the resolved output filename - called "savefile" in the source - from a requested resource. If tnftp is executed without the -o command-line option, it will resolve the output filename from the last component of the requested resource. If the output filename begins with a "|" character, tnftp will pass the fetched resource's output to the command directly following the "|" character through the use of the popen() function.

Author(s)

  • Jared McNeill
  • wvu <wvu@metasploit.com>

Platform

Unix

Architectures

cmd

Development

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/unix/http/tnftp_savefile
msf exploit(tnftp_savefile) > show targets
    ...targets...
msf exploit(tnftp_savefile) > set TARGET < target-id >
msf exploit(tnftp_savefile) > show options
    ...show and set options...
msf exploit(tnftp_savefile) > exploit

Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.

– Jim O’Gorman | President, Offensive Security

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