Full Report
Multiple vulnerabilities have been identified in the additional GNU/Linux subsystem of the SIMATIC S7-1500 TM MFP V1.1.1. Siemens is preparing fixes and recommends specific mitigations for products where fixes are not or not yet available.
Analysis Summary
# Vulnerability: Multiple Vulnerabilities in SIMATIC S7-1500 TM MFP GNU/Linux Subsystem
## CVE Details
- **CVE ID:** CVE-2024-58005, CVE-2023-52927, CVE-2024-53166, CVE-2024-58002, CVE-2025-21844, and others (48+ CVEs listed).
- **CVSS Score:**
- **CVSS v3.1:** 10.0 (Critical) / 7.8 (High) for specific components.
- **CVSS v4.0:** 8.7 (High).
- **CWE:** CWE-20 (Improper Input Validation) and others related to Linux kernel memory management and process handling.
## Affected Systems
- **Products:** SIMATIC S7-1500 TM MFP (Technology Module MultiFunctional Platform).
- **Versions:** All versions of the GNU/Linux subsystem integrated into V1.1.1.
- **Configurations:** Systems utilizing the additional GNU/Linux subsystem for edge processing or custom applications.
## Vulnerability Description
The advisory covers a large set of vulnerabilities identified within the Linux kernel and associated libraries used by the S7-1500 TM MFP's GNU/Linux subsystem.
A primary technical focus includes a flaw in **posix-cpu-timers**, where a race condition exists during `non-leader exec()` calls and task exits. Specifically, the subsystem failed to properly synchronize task lookups and `sighand` locking. This could lead to a scenario where the system attempts to access a task that is no longer visible or is in a transitional state, potentially causing memory corruption or kernel instability.
## Exploitation
- **Status:** Not reported as exploited in the wild; PoC availability is likely for general Linux kernel CVEs included in the list, but not specifically for the SIMATIC implementation.
- **Complexity:** Low to Medium (depending on the specific CVE).
- **Attack Vector:** Local (for kernel-level exploits) to Network (depending on exposed services within the Linux subsystem).
## Impact
- **Confidentiality:** High
- **Integrity:** High
- **Availability:** High
*(The CVSS 10.0 rating indicates a total compromise of the subsystem is possible.)*
## Remediation
### Patches
- **Status:** Siemens is currently **preparing fixes**. No specific patched version is listed as available in the current advisory version (V1.0).
### Workarounds
- **Network Isolation:** Ensure the GNU/Linux subsystem is not directly exposed to untrusted networks.
- **Access Control:** Restrict local user access within the Linux environment to minimize the risk of local privilege escalation via kernel flaws.
- **Feature Disabling:** If the GNU/Linux subsystem is not required for the specific automation task, consider disabling it or restricting its execution environment.
## Detection
- **Indicators of Compromise:** Unusual kernel panics, unexpected reboots of the TM MFP module, or unauthorized processes running within the Linux subsystem.
- **Detection Methods:** Monitor system logs for memory ordering warnings or `sighand` null pointer errors related to POSIX timers. Utilize industrial IDS/IPS to monitor traffic originating from the TM MFP's Linux interface.
## References
- **Vendor Advisory:** hxxps://cert-portal.siemens[.]com/productcert/html/ssa-784472.html
- **Siemens ProductCERT:** hxxps://www.siemens[.]com/cert/advisories