Learn about CVE-2022-41787 affecting F5 BIG-IP DNS and LTM versions, enabling undisclosed DNS queries to cause TMM termination. Find mitigation steps here.
BIG-IP DNS Express vulnerability CVE-2022-41787 allows undisclosed DNS queries with DNSSEC to cause TMM to terminate in certain versions of F5 BIG-IP.
Understanding CVE-2022-41787
This CVE affects BIG-IP versions 17.0.x, 16.1.x, 15.1.x, 14.1.x, and 13.1.x in both BIG-IP DNS and BIG-IP LTM products.
What is CVE-2022-41787?
In BIG-IP versions before specified patch levels, enabling DNS Express on a virtual server with DNS profile can lead to TMM termination due to undisclosed DNS queries with DNSSEC.
The Impact of CVE-2022-41787
The vulnerability poses a high availability impact, allowing attackers to cause TMM to terminate, affecting the reliability and operation of the affected systems.
Technical Details of CVE-2022-41787
This section provides deeper insights into the vulnerability specifics that users and administrators should be aware of.
Vulnerability Description
CVE-2022-41787 involves a scenario where specific configurations within BIG-IP DNS Express can be exploited to trigger a TMM termination, potentially disrupting services.
Affected Systems and Versions
The vulnerability affects F5's BIG-IP DNS and BIG-IP LTM versions 17.0.x, 16.1.x, 15.1.x, 14.1.x, and 13.1.x with specified versions less than the patch releases.
Exploitation Mechanism
Exploitation occurs when malicious actors send undisclosed DNS queries with DNSSEC, leveraging DNS Express configuration to trigger a termination of the Traffic Management Microkernel (TMM).
Mitigation and Prevention
To address CVE-2022-41787, specific steps and long-term security measures are recommended for affected users and enterprises.
Immediate Steps to Take
Users should apply the necessary patches provided by F5 to mitigate the vulnerability and prevent potential exploitation. Additionally, disabling DNS Express can serve as a temporary workaround.
Long-Term Security Practices
Implementing robust network security practices, monitoring DNS traffic, and staying updated with security advisories are essential for long-term protection against such vulnerabilities.
Patching and Updates
Regularly checking for security updates from F5 and promptly applying patches for affected versions is crucial to ensure system resilience and protection against known vulnerabilities.