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CVE-2024-49138: Risk in CLFS Log Handling on Windows

- S.T.A².R.S Team

Vulnerability CVE-2024-49138 allows attackers to remotely execute code

A high-severity vulnerability has been discovered affecting the Common Log File System (CLFS) functionality in Windows systems. This vulnerability, identified as CVE-2024-49138, allows attackers to execute remote code by exploiting insufficient validation in log entry handling.

Key Features of the Vulnerability

  • CVE Identifier: CVE-2024-49138.
  • Publication Date: 12/11/2024.
  • Affected Software: Common Log File System (CLFS) functionality in Windows systems.
  • CVSS Score: 7.8 (High).
  • Exploitation Requirements: Requires local access to the system but does not initially require elevated privileges.

The vulnerability arises due to insufficient validation in the CLFS functionality used to manage logs in Windows environments. With proper exploitation, an attacker could escalate privileges or execute malicious code with elevated permissions.

Mitigation and Recommendations

Microsoft has released security patches addressing this vulnerability. Implementing these updates as soon as possible is essential to protect affected systems. Additionally, limiting local access to critical systems is recommended.

For more information, refer to Microsoft’s official notes: MSRC CVE-2024-49138.

Vulnerability Detection

The presence of this vulnerability can be verified through:

  • Security Scans: Tools like Qualys and Nessus include specific detections for this vulnerability.
  • PoC Scripts: Proof-of-concept scripts are available on GitHub, such as this helpful resource: PoC on GitHub.

Conclusion

The CVE-2024-49138 vulnerability is a significant threat, especially in environments where CLFS is used to manage critical logs. Implementing the recommended mitigations and patches is crucial to reducing the risk.

As part of its emerging vulnerabilities service, Tarlogic Security proactively monitors the perimeter of its clients to report, detect, and urgently notify of the presence of this vulnerability, as well as other critical threats that could have a serious impact on the security of their assets.