PatchSiren cyber security CVE debrief

CVE-2024-24795 Apache Software Foundation CVE debrief

CVE-2024-24795 is a MEDIUM-severity HTTP Response Splitting vulnerability affecting Apache HTTP Server, published on 2024-11-12. The vulnerability allows an attacker who can inject malicious response headers into backend applications to cause HTTP desynchronization attacks. Siemens SINEC NMS is affected as it incorporates the vulnerable Apache HTTP Server component. CISA published advisory ICSA-24-319-04 on 2024-11-12 identifying this issue for industrial control systems environments. The vendor has provided a fix in SINEC NMS V3.0 SP1 or later. This vulnerability is not currently listed in CISA's Known Exploited Vulnerabilities (KEV) catalog.

Vendor: Apache Software Foundation
Product: SINEC NMS
CVSS: MEDIUM 6.1
CISA KEV: Not listed in stored evidence
Original CVE published: 2024-11-12
Original CVE updated: 2024-11-12
Advisory published: 2024-11-12
Advisory updated: 2024-11-12

Who should care

Organizations operating Siemens SINEC NMS in industrial control system environments, OT security teams managing network management systems, infrastructure teams relying on Apache HTTP Server in reverse proxy or load balancing configurations, and security operations centers monitoring for HTTP desynchronization attack patterns.

Technical summary

HTTP Response Splitting vulnerability in Apache HTTP Server allows attackers with ability to inject malicious response headers into backend applications to perform HTTP desynchronization attacks. This attack class can lead to request smuggling, cache poisoning, and potential authentication bypass in affected web infrastructure. The vulnerability exists in multiple modules of Apache HTTP Server and is resolved in version 2.4.59. Siemens SINEC NMS incorporates the vulnerable component and requires update to V3.0 SP1 or later for remediation.

Defensive priority

medium

Recommended defensive actions

Update Siemens SINEC NMS to V3.0 SP1 or later version to remediate this vulnerability
Review and implement CISA ICS recommended practices for defense-in-depth strategies
Monitor network traffic for anomalous HTTP request/response patterns that may indicate desynchronization attempts
Apply principle of least privilege for systems communicating with affected SINEC NMS instances
Validate that upstream Apache HTTP Server components are updated to version 2.4.59 or later where applicable

Evidence notes

CVE published 2024-11-12 per official record. CISA CSAF advisory ICSA-24-319-04 published same date. Siemens remediation guidance specifies update to V3.0 SP1 or later. CVSS 6.1 (MEDIUM) per source. Not in KEV catalog.

Official resources

2024-11-12