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Zyxel Firewall SUID Binary Privilege Escalation

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Zyxel Firewall SUID Binary Privilege Escalation

Disclosed
06/14/2022
Created
08/31/2022

Description

This module exploits CVE-2022-30526, a local privilege escalation vulnerability that allows a low privileged user (e.g. nobody) escalate to root. The issue stems from a suid binary that allows all users to copy files as root. This module overwrites the firewall's crontab to execute an attacker provided script, resulting in code execution as root. In order to use this module, the attacker must first establish shell access. For example, by exploiting CVE-2022-30525. Known affected Zyxel models are: USG FLEX (50, 50W, 100W, 200, 500, 700), ATP (100, 200, 500, 700, 800), VPN (50, 100, 300, 1000), USG20-VPN and USG20W-VPN.

Author(s)

  • jbaines-r7

Platform

Linux,Unix

Architectures

cmd, mips64

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

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