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Webmin Upload Authenticated RCE

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Webmin Upload Authenticated RCE

Disclosed
01/17/2019
Created
03/19/2019

Description

This module exploits an arbitrary command execution vulnerability in Webmin 1.900 and lower versions. Any user authorized to the "Upload and Download" module can execute arbitrary commands with root privileges. In addition, if the 'Running Processes' (proc) privilege is set the user can accurately determine which directory to upload to. Webmin application files can be written/overwritten, which allows remote code execution. The module has been tested successfully with Webmin 1.900 on Ubuntu v18.04. Using GUESSUPLOAD attempts to use a default installation path in order to trigger the exploit.

Author(s)

  • AkkuS <Özkan Mustafa Akkuş>
  • Ziconius <Kris.Anderson@immersivelabs.com>

Platform

Unix

Architectures

cmd

Development

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