CVE-2018-4854 Missing authorization in SICLOCK TC100, SICLOCK TC400

High 8.8 Published 3 Jul 2018 Updated 16 Sep 2024

An attacker can modify the administrative client on SICLOCK devices via TFTP, leading to code execution when users download and run the tampered file.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: A user has to click or open something
Fix: None listed

What is CVE-2018-4854?

CVE-2018-4854 is a high-severity missing authorization vulnerability in Siemens AG SICLOCK TC100, SICLOCK TC400, published on 3 Jul 2018. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official description

A vulnerability has been identified in SICLOCK TC100 (All versions) and SICLOCK TC400 (All versions). An attacker with network access to port 69/udp could modify the administrative client stored on the device. If a legitimate user downloads and executes the modified client from the affected device, then he/she could obtain code execution on the client system.

Weakness: CWE-306

Which versions are affected by CVE-2018-4854?

It affects 2 products.

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

How do I fix CVE-2018-4854?

No fix has been published for CVE-2018-4854 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2018-4854 being exploited?

There is no known exploitation of CVE-2018-4854 in the wild and no public exploit code.

Sources

Also known as GHSA-w4g7-qqm9-9hj6.