CVE-2018-4852 Auth bypass in SICLOCK TC100, SICLOCK TC400

Critical 9.8 Published 3 Jul 2018 Updated 17 Sep 2024

An attacker with network access can bypass authentication on Siemens SICLOCK devices if they possess specific device knowledge.

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-2018-4852?

CVE-2018-4852 is a critical authentication bypass vulnerability in Siemens AG SICLOCK TC100, SICLOCK TC400, published on 3 Jul 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability has been identified in SICLOCK TC100 (All versions) and SICLOCK TC400 (All versions). An attacker with network access to the device could potentially circumvent the authentication mechanism if he/she is able to obtain certain knowledge specific to the attacked device.

Weakness: CWE-287, CWE-288

Which versions are affected by CVE-2018-4852?

It affects 2 products.

Products include Siemens Siclock Tc100 Firmware, Siemens Siclock Tc400 Firmware.

How do I fix CVE-2018-4852?

No fix has been published for CVE-2018-4852 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2018-4852 being exploited?

There is no known exploitation of CVE-2018-4852 in the wild and no public exploit code.

Sources

Also known as GHSA-25mm-w8qr-qm89.