F5 BIG-IP Traffic Management Microkernel Buffer Overflow

[ Why it matters ]Priority signals

• Exploited in the wild: on CISA's Known Exploited Vulnerabilities list since 2022-01-18
• EPSS: 61% chance of exploitation in the next 30 days (higher than 99% of CVEs)
• Critical severity: CVSS 9.8

[ Description ]Official description

On BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.2.1, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, and 12.1.x before 12.1.5.3, undisclosed requests to a virtual server may be incorrectly handled by the Traffic Management Microkernel (TMM) URI normalization, which may trigger a buffer overflow, resulting in a DoS attack. In certain situations, it may theoretically allow bypass of URL based access control or remote code execution (RCE). Note: Software versions which have reached End of Software Development (EoSD) are not evaluated.

CISA: The Traffic Management Microkernel of BIG-IP ASM Risk Engine has a buffer overflow vulnerability, leading to a bypassing of URL-based access controls.

[ Fixes ]Fixes and patches

CISA required action (US federal deadline 1 Feb 2022): Apply updates per vendor instructions.

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• support.f5.com/csp/article/K56715231Vendor Advisory
• www.cisa.gov/known-exploited-vulnerabilities-catalogUS Government Resource