module

Solaris xscreensaver log Privilege Escalation

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Disclosed
2019-10-16
Created
2019-10-24

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).

Authors

Marco Ivaldi
bcoles bcoles@gmail.com

Platform

Solaris,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/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
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