CVE-2023-34138 Command injection in ATP series firmware

High 8.0 Published 17 Jul 2023 Updated 30 Oct 2024

An unauthenticated LAN attacker can execute OS commands on Zyxel firewalls if an admin adds their IP to trusted RADIUS clients.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Local or same network only
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2023-34138?

CVE-2023-34138 is a high-severity command injection vulnerability in Zyxel ATP series firmware, published on 17 Jul 2023. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.

Official description

A command injection vulnerability in the hotspot management feature of the Zyxel ATP series firmware versions 4.60 through 5.36 Patch 2, USG FLEX series firmware versions 4.60 through 5.36 Patch 2, USG FLEX 50(W) series firmware versions 4.60 through 5.36 Patch 2, USG20(W)-VPN series firmware versions 4.60 through 5.36 Patch 2, and VPN series firmware versions 4.60 through 5.36 Patch 2, could allow an unauthenticated, LAN-based attacker to execute some OS commands on an affected device if the attacker could trick an authorized administrator to add their IP address to the list of trusted RADIUS clients in advance.

Weakness: CWE-78

Which versions are affected by CVE-2023-34138?

It affects 22 products.

Products include Zyxel Usg 20w-Vpn Firmware, Zyxel Usg 2200-Vpn Firmware, Zyxel Usg Flex 100 Firmware, Zyxel Usg Flex 100w Firmware, Zyxel Usg Flex 200 Firmware, Zyxel Usg Flex 500 Firmware and 16 more.

How do I fix CVE-2023-34138?

No fix has been published for CVE-2023-34138 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2023-34138 being exploited?

There is no known exploitation of CVE-2023-34138 in the wild and no public exploit code.

Sources

Also known as GHSA-886j-wm8v-5q3q.