A vulnerability was found in SICLOCK TC100 and TC400 (version unknown) and classified as critical. This issue affects an unknown function. The manipulation with an unknown input leads to a access control vulnerability. Using CWE to declare the problem leads to CWE-284. The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

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.

The bug was discovered 07/03/2018. The weakness was released 07/03/2018 (Website). The advisory is shared at cert-portal.siemens.com. The identification of this vulnerability is CVE-2018-4854 since 01/02/2018. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1068 for this issue.

Addressing this vulnerability is possible by firewalling udp/69.

The vulnerability is also documented in the vulnerability database at SecurityFocus (BID 104672†).

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• SICLOCK

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• TC100
• TC400

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