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ImageMagick Delegate Arbitrary Command Execution

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ImageMagick Delegate Arbitrary Command Execution

Disclosed
05/03/2016
Created
05/30/2018

Description

This module exploits a shell command injection in the way "delegates" (commands for converting files) are processed in ImageMagick versions <= 7.0.1-0 and <= 6.9.3-9 (legacy). Since ImageMagick uses file magic to detect file format, you can create a .png (for example) which is actually a crafted SVG (for example) that triggers the command injection. The PostScript (PS) target leverages a Ghostscript -dSAFER bypass (discovered by taviso) to achieve RCE in the Ghostscript delegate. Ghostscript versions 9.18 and later are affected. This target is provided as is and will not be updated to track additional vulns. If USE_POPEN is set to true, a |-prefixed command will be used for the exploit. No delegates are involved in this exploitation.

Author(s)

  • stewie
  • Nikolay Ermishkin
  • Tavis Ormandy
  • wvu <wvu@metasploit.com>
  • hdm <x@hdm.io>

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/fileformat/imagemagick_delegate
msf exploit(imagemagick_delegate) > show targets
    ...targets...
msf exploit(imagemagick_delegate) > set TARGET < target-id >
msf exploit(imagemagick_delegate) > show options
    ...show and set options...
msf exploit(imagemagick_delegate) > exploit

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– Jim O’Gorman | President, Offensive Security

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