module

Local Privilege Escalation in polkits pkexec

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Disclosed
2022-01-25
Created
2022-03-03

Description

A bug exists in the polkit pkexec binary in how it processes arguments. If
the binary is provided with no arguments, it will continue to process environment
variables as argument variables, but without any security checking.
By using the execve call we can specify a null argument list and populate the
proper environment variables. This exploit is architecture independent.

Authors

Qualys Security
Andris Raugulis
Dhiraj Mishra
bwatters-r7

Platform

Linux

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/linux/local/cve_2021_4034_pwnkit_lpe_pkexec
    msf exploit(cve_2021_4034_pwnkit_lpe_pkexec) > show targets
        ...targets...
    msf exploit(cve_2021_4034_pwnkit_lpe_pkexec) > set TARGET < target-id >
    msf exploit(cve_2021_4034_pwnkit_lpe_pkexec) > show options
        ...show and set options...
    msf exploit(cve_2021_4034_pwnkit_lpe_pkexec) > exploit
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