CVE-2024-58009 Siemens CVE debrief

Who should care

Industrial control system operators, OT security teams, and organizations deploying Siemens SIMATIC S7-1500 TM MFP controllers in manufacturing, process control, or critical infrastructure environments should prioritize assessment. System integrators and maintenance personnel with interactive shell access to affected devices face elevated risk exposure.

Technical summary

The vulnerability exists in the Linux kernel's Bluetooth L2CAP (Logical Link Control and Adaptation Protocol) implementation. Specifically, l2cap_sock_alloc() fails to properly handle cases where socket allocation returns NULL, leading to a NULL pointer dereference. This can trigger a kernel panic or system crash when exploited locally. The affected component is the GNU/Linux subsystem within Siemens SIMATIC S7-1500 TM MFP programmable logic controllers, which incorporate embedded Linux environments for extended functionality. The vulnerability requires local access with low privileges but no user interaction, making it exploitable by authenticated users with shell access to the device's Linux subsystem.

Defensive priority

medium

Recommended defensive actions

• Restrict interactive shell access to the GNU/Linux subsystem to trusted personnel only
• Build and run only applications from trusted sources
• Monitor for anomalous Bluetooth subsystem activity on affected devices
• Apply vendor patches when Siemens releases a fix
• Segment affected industrial control systems from untrusted networks

Evidence notes

The vulnerability description indicates a NULL pointer handling issue in the Bluetooth L2CAP socket allocation function. Siemens has confirmed this affects the GNU/Linux subsystem of SIMATIC S7-1500 TM MFP devices. The CVSS vector (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H) confirms local attack vector with low complexity, requiring low privileges but no user interaction, resulting in high availability impact only.

Official resources