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Ghostscript Failed Restore Command Execution

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Ghostscript Failed Restore Command Execution

Disclosed
08/21/2018
Created
03/19/2019

Description

This module exploits a -dSAFER bypass in Ghostscript to execute arbitrary commands by handling a failed restore (grestore) in PostScript to disable LockSafetyParams and avoid invalidaccess. This vulnerability is reachable via libraries such as ImageMagick.

Author(s)

  • Tavis Ormandy
  • wvu <wvu@metasploit.com>

Platform

Linux,Unix,Windows

Architectures

cmd, x86, x64

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