Full Report
Multiple vulnerabilities have been identified in the BIOS of the SIMATIC S7-1500 TM MFP. Siemens is preparing fix versions and recommends specific countermeasures for products where fixes are not, or not yet available.
Analysis Summary
# Vulnerability: Multiple BIOS/Kernel Flaws in SIMATIC S7-1500 TM MFP
## CVE Details
- **CVE IDs:** CVE-2024-26982, CVE-2024-41046, CVE-2024-41049, CVE-2024-41055, CVE-2024-42154, CVE-2024-42161, CVE-2024-53124, CVE-2024-57940, CVE-2024-57981, CVE-2024-58005, CVE-2025-8058, CVE-2025-21647, CVE-2025-21653, CVE-2025-21678, CVE-2025-21703, CVE-2025-21762, CVE-2025-21776, CVE-2025-21806, CVE-2025-21826.
- **CVSS Score:** 7.8 (High) - *Note: Individual CVE scores vary; the primary advisory lists 7.8 as the max Base Score.*
- **CWE:** CWE-125 (Out-of-bounds Read), CWE-415 (Double Free), CWE-476 (NULL Pointer Dereference), CWE-20 (Improper Input Validation).
## Affected Systems
- **Products:** SIMATIC S7-1500 TM MFP (Technology Module Multi Functional Platform).
- **Versions:** All versions of the SIMATIC S7-1500 TM MFP BIOS are affected.
- **Configurations:** Systems running SIMATIC Industrial OS.
## Vulnerability Description
This advisory covers several vulnerabilities primarily residing in the Linux kernel integrated into the SIMATIC S7-1500 TM MFP BIOS/Firmware. Key technical flaws include:
- **Memory Management Issues:** Double-free scenarios in ethernet drivers (CVE-2024-41046) and use-after-free (UAF) risks in file locking and ARP transmission (CVE-2025-21762).
- **Filesystem Errors:** Out-of-bounds reads in Squashfs when handling invalid inode numbers (CVE-2024-26982).
- **Logic/Validation Errors:** Improper input validation in netfilter (CVE-2025-21826) and NULL pointer dereferences when interacting with non-compliant USB devices (CVE-2025-21776).
## Exploitation
- **Status:** Not exploited in the wild (based on current advisory data).
- **Complexity:** Low to Medium.
- **Attack Vector:** Local (Most vulnerabilities require local access to the OS environment to execute code or trigger crashes).
## Impact
- **Confidentiality:** Medium to High (Possibility of out-of-bounds reads and memory leakage).
- **Integrity:** Medium (Potential for data corruption through memory mismanagement).
- **Availability:** High (Most flaws lead to kernel panics, system crashes, or Denial of Service).
## Remediation
### Patches
- **No patches currently available.** Siemens is currently preparing fix versions for the affected products.
### Workarounds
- **Trusted Applications:** Ensure that only applications from trusted sources are built and executed on the multi-functional platform.
- **Network Segmentation:** Protect network access to the devices using firewalls and VLANs.
- **Operational Guidelines:** Adhere to Siemens' operational guidelines for Industrial Security and follow specific product manual security recommendations.
## Detection
- **Indicators of Compromise:** Unexplained system reboots, kernel panic logs, or unexpected memory usage patterns.
- **Detection methods and tools:** Usage of host-based security monitoring to detect unauthorized application execution or exploit attempts targeting kernel functions.
## References
- **Vendor Advisory:** [https://cert-portal.siemens.com/productcert/html/ssa-503939.html](https://cert-portal.siemens.com/productcert/html/ssa-503939.html)
- **Siemens Industrial Security Guidelines:** [https://www.siemens.com/cert/operational-guidelines-industrial-security](https://www.siemens.com/cert/operational-guidelines-industrial-security)
- **Contact:** [https://www.siemens.com/cert/advisories](https://www.siemens.com/cert/advisories)