Headline
CVE-2022-30525: Zyxel security advisory for OS command injection vulnerability of firewalls
A OS command injection vulnerability in the CGI program of Zyxel USG FLEX 100(W) firmware versions 5.00 through 5.21 Patch 1, USG FLEX 200 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 500 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 700 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 50(W) firmware versions 5.10 through 5.21 Patch 1, USG20(W)-VPN firmware versions 5.10 through 5.21 Patch 1, ATP series firmware versions 5.10 through 5.21 Patch 1, VPN series firmware versions 4.60 through 5.21 Patch 1, which could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device.
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CVE: CVE-2022-30525
Summary
Zyxel has released patches for an OS command injection vulnerability found by Rapid 7 and urges users to install them for optimal protection.
What is the vulnerability?
A command injection vulnerability in the CGI program of some firewall versions could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device.
What versions are vulnerable-and what should you do?
After a thorough investigation, we’ve identified the vulnerable products that are within their vulnerability support period and released patches to address the vulnerability, as shown in the table below.
Affected model
Affected firmware version
Patch availability
USG FLEX 100(W), 200, 500, 700
ZLD V5.00 through ZLD V5.21 Patch 1
ZLD V5.30
USG FLEX 50(W) / USG20(W)-VPN
ZLD V5.10 through ZLD V5.21 Patch 1
ZLD V5.30
ATP series
ZLD V5.10 through ZLD V5.21 Patch 1
ZLD V5.30
VPN series
ZLD V4.60 through ZLD V5.21 Patch 1
ZLD V5.30
Got a question?
Please contact your local service rep or visit Zyxel’s forum for further information or assistance.
Acknowledgment and commentary
Thanks to Rapid7 for reporting the CVE-2022-30525 issue to us. However, there was miscommunication during the disclosure coordination process with Rapid7. As a CNA, Zyxel always follows the principles of coordinated disclosure to arrange public disclosure with reporters.
Revision history
2022-05-12: Initial release
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This Metasploit 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 include USG FLEX (50, 50W, 100W, 200, 500, 700), ATP (100, 200, 500, 700, 800), VPN (50, 100, 300, 1000), USG20-VPN and USG20W-VPN.
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Zyxel has moved to address a critical security vulnerability affecting Zyxel firewall devices that enables unauthenticated and remote attackers to gain arbitrary code execution. "A command injection vulnerability in the CGI program of some firewall versions could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device," the company said in an advisory
A OS command injection vulnerability in the CGI program of Zyxel USG FLEX 100(W) firmware versions 5.00 through 5.21 Patch 1, USG FLEX 200 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 500 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 700 firmware versions 5.00 through 5.21 Patch 1, USG FLEX 50(W) firmware versions 5.10 through 5.21 Patch 1, USG20(W)-VPN firmware versions 5.10 through 5.21 Patch 1, ATP series firmware versions 5.10 through 5.21 Patch 1, VPN series firmware versions 4.60 through 5.21 Patch 1, which could allow an attacker to modify specific files and then execute some OS commands on a vulnerable device.