PatchSiren

PatchSiren cyber security CVE debrief

CVE-2023-4611 Siemens CVE debrief

A use-after-free vulnerability exists in the Linux kernel's memory management subsystem, specifically in mm/mempolicy.c. The flaw arises from a race condition between the mbind() system call and VMA-locked page fault handling. This vulnerability affects Siemens SINEC NMS, which incorporates the vulnerable Linux kernel components. A local attacker with low privileges could exploit this race condition to trigger a use-after-free, potentially causing system crashes or leaking kernel memory information. The attack requires local access and is rated as medium severity with a CVSS 3.1 score of 6.3. The vulnerability was disclosed publicly on August 13, 2024, through CISA's ICS advisory program and Siemens' security advisory process.

Vendor
Siemens
Product
SINEC NMS
CVSS
MEDIUM 6.3
CISA KEV
Not listed in stored evidence
Original CVE published
2024-08-13
Original CVE updated
2024-08-13
Advisory published
2024-08-13
Advisory updated
2024-08-13

Who should care

Organizations operating Siemens SINEC NMS in industrial environments should prioritize patching. System administrators responsible for OT/ICS infrastructure, security teams monitoring industrial control systems, and organizations with compliance requirements for critical infrastructure protection should assess exposure and apply vendor updates.

Technical summary

The vulnerability exists in the Linux kernel's memory policy implementation (mm/mempolicy.c). The mbind() system call, used to set memory policies for address ranges, can race with VMA-locked page fault handling. This race condition can result in a use-after-free scenario where memory is accessed after being freed. The vulnerability requires local access and low privileges, with high attack complexity due to the race condition timing requirements. Successful exploitation can lead to denial of service through system crashes or information disclosure through kernel memory leaks. The vulnerability is not known to be exploited in ransomware campaigns and does not have a known exploit in the wild according to available sources.

Defensive priority

medium

Recommended defensive actions

  • Apply vendor-provided updates: Upgrade Siemens SINEC NMS to version 3.0 or later as specified in the vendor security advisory
  • Restrict local access: Limit local user accounts and privileges on systems running SINEC NMS to reduce attack surface
  • Monitor for anomalies: Implement system monitoring to detect unexpected crashes or memory-related errors that could indicate exploitation attempts
  • Follow ICS security practices: Apply CISA's recommended practices for industrial control systems defense in depth
  • Review vendor guidance: Consult Siemens security advisory SSA-784301 for additional product-specific mitigation guidance

Evidence notes

The vulnerability description and affected product information are derived from CISA CSAF advisory ICSA-24-228-06, which references Siemens security advisory SSA-784301. The CVSS vector indicates local attack vector, high attack complexity, low privileges required, and impacts to confidentiality and availability.

Official resources

2024-08-13