Full Report
SINEC OS is affected by multiple vulnerabilities due to open UDP ports, which could allow an attacker to access non-sensitive information without authentication or potentially cause temporary denial of service. Siemens is preparing fix versions and recommends specific countermeasures for products where fixes are not, or not yet available.
Analysis Summary
# Vulnerability: Multiple UDP Port Vulnerabilities in SINEC OS
## CVE Details
- CVE ID: CVE-2025-40802, CVE-2025-40803
- CVSS Score: 3.1 (CVSS v3.1) / 2.3 (CVSS v4.0) (Low)
- CWE: CVE-2025-40802: CWE-400 (Uncontrolled Resource Consumption); CVE-2025-40803: CWE-200 (Exposure of Sensitive Information to an Unauthorized Actor)
## Affected Systems
- Products: RUGGEDCOM RST2428P (6GK6242-6PA00) running SINEC OS.
- Versions: All versions affected by the listed CVEs.
- Configurations: Affects systems utilizing insecurely configured open UDP ports for discovery protocols (LLDP, DCP, MRP, etc.).
## Vulnerability Description
SINEC OS is affected by multiple vulnerabilities stemming from open UDP ports:
1. **CVE-2025-40802 (Resource Exhaustion/DoS):** An attacker can subject the device to a high volume of query requests via network access, potentially causing temporary denial of service (DoS) by exhausting resources. The system is expected to recover once the activity ceases.
2. **CVE-2025-40803 (Information Disclosure):** The device exposes certain non-critical information via open UDP ports, which could allow an unauthenticated attacker to access this data, leading to a breach of confidentiality concerning non-sensitive information.
## Exploitation
- Status: Not specified if exploited in the wild. PoC availability is not mentioned, but network-based access suggests potential feasibility.
- Complexity: Medium (Implied by CVSS vectors: AC:H - Attack Complexity: High)
- Attack Vector: Adjacent Network (AV:A)
## Impact
- Confidentiality: Low (Due to CVE-2025-40803 exposing non-sensitive information)
- Integrity: No Impact
- Availability: Low (Due to CVE-2025-40802 causing temporary DoS)
## Remediation
### Patches
- Currently, no definitive fix versions are listed for the affected product in this summary. Siemens is preparing fix versions.
### Workarounds
1. **Firewall Implementation (Recommended Mitigation):** Create firewall rules to explicitly block the required UDP ports if they are not necessary for operation:
* UDP port **34964**.
* One port in the range **49152-65535** used for discovery protocols (LLDP, DCP, MRP, etc.).
2. **General Security Practices:** Configure the environment according to Siemens' operational guidelines for Industrial Security.
## Detection
- **Indicators of Compromise (IoCs):** No specific IoCs are provided, but monitoring for high volumes of illegitimate UDP connection attempts targeting ports 34964 and the 49152-65535 range may indicate reconnaissance or DoS attempts.
- **Detection Methods and Tools:** Use network intrusion detection systems (NIDS) or host-based monitoring to track unusual UDP traffic patterns targeting the device.
## References
- Vendor Advisories: SSA-494539