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Solaris xscreensaver log Privilege Escalation

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Solaris xscreensaver log Privilege Escalation

Disclosed
10/16/2019
Created
10/24/2019

Description

This module exploits a vulnerability in `xscreensaver` versions since 5.06 on unpatched Solaris 11 systems which allows users to gain root privileges. `xscreensaver` allows users to create a user-owned file at any location on the filesystem using the `-log` command line argument introduced in version 5.06. This module uses `xscreensaver` to create a log file in `/usr/lib/secure/`, overwrites the log file with a shared object, and executes the shared object using the `LD_PRELOAD` environment variable. This module has been tested successfully on: xscreensaver version 5.15 on Solaris 11.1 (x86); and xscreensaver version 5.15 on Solaris 11.3 (x86).

Author(s)

  • Marco Ivaldi
  • bcoles <bcoles@gmail.com>

Platform

Solaris,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/solaris/local/xscreensaver_log_priv_esc
msf exploit(xscreensaver_log_priv_esc) > show targets
    ...targets...
msf exploit(xscreensaver_log_priv_esc) > set TARGET < target-id >
msf exploit(xscreensaver_log_priv_esc) > show options
    ...show and set options...
msf exploit(xscreensaver_log_priv_esc) > 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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