MODULE

GameOver(lay) Privilege Escalation and Container Escape

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GameOver(lay) Privilege Escalation and Container Escape

Disclosed
07/26/2023
Created
12/19/2024

Description

This module exploits the use of unsafe functions in a number of Ubuntu kernels utilizing vunerable versions of overlayfs. To mitigate CVE-2021-3493 the Linux kernel added a call to vfs_setxattr during ovl_do_setxattr. Due to independent changes to the kernel by the Ubuntu development team __vfs_setxattr_noperm is called during ovl_do_setxattr without calling the intermediate safety function vfs_setxattr. Ultimatly this module allows for root access to be achieved by writing setuid capabilities to a file which are not sanitized after being unioned with the upper mounted directory.

Author(s)

  • g1vi
  • h00die
  • bwatters-r7
  • gardnerapp

Platform

Linux,Unix

Development

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/linux/local/gameoverlay_privesc
msf exploit(gameoverlay_privesc) > show targets
    ...targets...
msf exploit(gameoverlay_privesc) > set TARGET < target-id >
msf exploit(gameoverlay_privesc) > show options
    ...show and set options...
msf exploit(gameoverlay_privesc) > exploit

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