QID 730491

Date Published: 2022-05-16

QID 730491: Zyxel Firewall OS Command Injection Vulnerability

Zyxel Communications Corp. is a manufacturer of DSL and other networking devices.

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.

Affected Versions:
ATP series running firmware: ZLD V5.00 through ZLD V5.21 Patch 1
VPN series running firmware: ZLD V4.60 through ZLD V5.21 Patch 1
USG FLEX 100(W), 200, 500, 700: ZLD V5.00 through ZLD V5.21 Patch 1
USG FLEX 50(W) / USG20(W)-VPN: ZLD V5.10 through ZLD V5.21 Patch 1

QID Detection Logic:(Unauthenticated)
This QID checks for vulnerable Zyxel Firewall by sending a crafted payload to ztp/cgi-bin/handler.

This allows an attacker to modify specific files and then execute some OS commands on a vulnerable device.

  • CVSS V3 rated as Critical - 9.8 severity.
  • CVSS V2 rated as Critical - 10 severity.
    • Solution
    Customer are advised to update the device firmware
    For more details please refer to advisory here.
    Vendor References

    CVEs related to QID 730491

    CVE-2022-30525 |
    Software Advisories
    Advisory ID Software Component Link
    CVE-2022-30525 URL Logo www.zyxel.com/support/Zyxel-security-advisory-for-OS-command-injection-vulnerability-of-firewalls.shtml
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