module

ImageMagick Delegate Arbitrary Command Execution

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Disclosed
2016-05-03
Created
2018-05-30

Description

This module exploits a shell command injection in the way "delegates"
(commands for converting files) are processed in ImageMagick versions

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.

Authors

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

Platform

Unix

Architectures

cmd

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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