CVE-2023-6916 Siemens CVE debrief

Who should care

Organizations operating Siemens RUGGEDCOM APE1808LNX industrial networking equipment, particularly those utilizing OpenAPI functionality for system integration or management. Critical infrastructure operators, manufacturing facilities, utilities, and transportation systems relying on RUGGEDCOM devices for secure industrial communications should prioritize assessment and remediation. Security teams responsible for OT/ICS environments, network administrators managing industrial edge devices, and compliance officers overseeing NERC CIP or similar industrial security frameworks should review this advisory.

Technical summary

CVE-2023-6916 affects Siemens RUGGEDCOM APE1808LNX industrial communication devices where audit records generated for OpenAPI requests may contain sensitive information. This information disclosure weakness could be leveraged by attackers to achieve unauthorized access and privilege escalation within affected systems. The vulnerability requires high privileges to exploit but presents significant impact potential given the high confidentiality, integrity, and availability ratings. Siemens has identified mitigations including proper user access controls for OpenAPI usage and IP-based API key restrictions, with a vendor fix available in Nozomi Guardian/CMC version 23.4.1.

Defensive priority

HIGH

Recommended defensive actions

• Create dedicated OpenAPI user accounts with minimal permissions to limit exposure of sensitive audit data
• Restrict API key usage to specific allowed IP addresses to reduce attack surface
• Implement periodic regeneration of existing API keys and review sign-in activity via API keys in audit records
• Contact Siemens customer support to obtain patch information for upgrading Nozomi Guardian/CMC to version 23.4.1
• Apply vendor-provided security updates when available to remediate the information disclosure vulnerability
• Monitor audit logs for anomalous OpenAPI request patterns that may indicate attempted exploitation

Evidence notes

CVE published and modified 2024-05-14. CISA advisory ICSA-24-137-11 published same date. Siemens SSA-292022 issued for affected RUGGEDCOM APE1808LNX products. CVSS 7.2 HIGH severity with network attack vector and high privilege requirements.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.