Full Report
SINEC OS before V3.1 contains third-party components with multiple vulnerabilities. Siemens has released new versions for the affected products and recommends to update to the latest versions.
Analysis Summary
# Vulnerability: Multiple Third-Party Component Flaws in SINEC OS
## CVE Details
This advisory covers numerous CVEs. Key high-severity identifiers include:
- **CVE-2023-5178**: CVSS **8.8** (High) - Use-After-Free in NVMe-oF/TCP.
- **CVE-2023-5717**: CVSS **7.8** (High) - Heap Out-of-bounds Write in Linux Perf.
- **CVE-2023-6040**: CVSS **7.8** (High) - Out-of-bounds Access in Netfilter.
- **CVE-2022-48935**: CVSS **5.5** (Medium) - Use-After-Free in Netfilter.
- **CVE-2023-5678**: CVSS **5.3** (Medium) - Denial of Service in OpenSSL DH key generation.
- **CVE-2024-46677/46685**: CVSS **5.5** (Medium) - NULL Pointer Dereferences.
**CWEs involved:** CWE-416 (Use After Free), CWE-787 (Out-of-bounds Write), CWE-476 (NULL Pointer Dereference), CWE-20 (Improper Input Validation), CWE-606 (Unchecked Input).
## Affected Systems
- **Products:** Siemens RUGGEDCOM RST2428P (6GK6242-6PA00) and other devices utilizing SINEC OS.
- **Versions:** All SINEC OS versions **before V3.1**.
- **Configurations:** Systems utilizing Linux kernel services (Netfilter, NVMe-oF/TCP, Perf events) or OpenSSL cryptographic functions.
## Vulnerability Description
SINEC OS versions prior to V3.1 incorporate third-party components (primarily the Linux Kernel and OpenSSL) containing multiple security flaws:
1. **Memory Corruption:** Use-after-free and out-of-bounds write vulnerabilities in the Linux kernel's networking (Netfilter) and storage (NVMe) subsystems could allow for privilege escalation or remote code execution.
2. **Denial of Service (DoS):** OpenSSL functions for Diffie-Hellman (DH) key generation fail to properly check for excessively large parameters, leading to long processing delays. Kernel-level NULL pointer dereferences can also trigger system crashes.
3. **Information Leak:** Certain flaws (e.g., CVE-2023-3567) allow local users to leak internal kernel memory information.
## Exploitation
- **Status:** PoCs available for several included Linux Kernel CVEs; no specific reports of exploitation in the wild for SINEC OS devices.
- **Complexity:** Ranges from **Low** (for DoS/Local Elevation) to **High** (for remote execution involving NVMe-oF).
- **Attack Vector:** Primarily **Local** (requiring authenticated/local access), though some components (OpenSSL, NVMe-oF) have **Network** vectors.
## Impact
- **Confidentiality:** High (Memory leaks and potential data access).
- **Integrity:** High (Potential for code execution and privilege escalation).
- **Availability:** High (System crashes via NULL pointers or resource exhaustion via OpenSSL).
## Remediation
### Patches
- **Update to SINEC OS V3.1 or later.** Siemens has integrated updated third-party components that resolve these vulnerabilities.
### Workarounds
- Limit network access to affected devices using firewalls.
- Ensure only trusted users have local/shell access to the device.
- Disable unused services (e.g., NVMe-oF/TCP) if not required for operations.
## Detection
- **Indicators of Compromise:** Unexpected system reboots, kernel panic logs in `dmesg` or syslog, and unusual CPU spikes during TLS handshakes (OpenSSL DoS).
- **Detection Methods:** Utilize vulnerability scanners to identify firmware versions lower than V3.1 on RUGGEDCOM and SINEC OS-based hardware.
## References
- **Siemens Advisory:** hxxps://cert-portal.siemens[.]com/productcert/html/ssa-613116.html
- **Contact:** hxxps://www.siemens[.]com/cert/advisories
- **Terms of Use:** hxxps://www.siemens[.]com/productcert/terms-of-use