CVE-2023-0160 Siemens CVE debrief

Who should care

Organizations operating Siemens TIM 1531 IRC industrial communication devices in manufacturing, energy, and critical infrastructure environments should prioritize this update. System administrators responsible for industrial control system (ICS) security, OT security teams, and asset owners with deployed Siemens industrial networking equipment should assess exposure and apply the vendor fix.

Technical summary

CVE-2023-0160 is a deadlock vulnerability in the Linux kernel's Berkeley Packet Filter (BPF) subsystem. The flaw exists in the BPF verifier and program loading mechanisms where improper locking can lead to a deadlock condition. A local user with appropriate privileges can exploit this to cause a system crash, resulting in denial of service. The vulnerability affects Siemens SIPLUS TIM 1531 IRC (6AG1543-1MX00-7XE0) and TIM 1531 IRC (6GK7543-1MX00-0XE0) industrial communication modules, which utilize embedded Linux systems. The CVSS 3.1 score of 5.5 (MEDIUM) reflects the local attack vector and high availability impact with no confidentiality or integrity impact.

Defensive priority

medium

Recommended defensive actions

• Update affected Siemens TIM 1531 IRC devices to firmware version 2.4.8 or later
• Apply vendor-provided patches through Siemens Industry Online Support portal
• Implement network segmentation for industrial control systems per CISA recommended practices
• Monitor for anomalous local access attempts on affected devices
• Review and apply defense-in-depth strategies for industrial control environments

Evidence notes

The vulnerability was disclosed in CISA advisory ICSA-24-165-06 on June 11, 2024, with a subsequent update on July 9, 2024. The advisory references Siemens security advisory SSA-337522. The CVSS 3.1 vector (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) confirms local attack vector with low attack complexity and high availability impact.

Official resources