CVE-2019-5074 Memory corruption in WAGO PFC100

Critical 9.8 Published 18 Dec 2019 Updated 4 Aug 2024

Unauthenticated attackers can trigger a stack buffer overflow in the iocheckd service to execute arbitrary code on WAGO PFC controllers.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2019-5074?

CVE-2019-5074 is a critical memory corruption vulnerability in WAGO PFC100, published on 18 Dec 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An exploitable stack buffer overflow vulnerability exists in the iocheckd service ''I/O-Check'' functionality of WAGO PFC200 Firmware version 03.01.07(13), WAGO PFC200 Firmware version 03.00.39(12) and WAGO PFC100 Firmware version 03.00.39(12). A specially crafted set of packets can cause a stack buffer overflow, resulting in code execution. An attacker can send unauthenticated packets to trigger this vulnerability.

Weakness: CWE-787

Which versions are affected by CVE-2019-5074?

It affects 2 products.

Products include Wago Pfc 100 Firmware, Wago Pfc 200 Firmware.

How do I fix CVE-2019-5074?

No fix has been published for CVE-2019-5074 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2019-5074 being exploited?

There is no known exploitation of CVE-2019-5074 in the wild and no public exploit code.

Sources

Also known as GHSA-cc6m-vg7g-249c.