CVE-2021-23013 : Security Advisory and Response

This article delves into the details of CVE-2021-23013, affecting BIG-IP versions prior to specific releases.

Understanding CVE-2021-23013

CVE-2021-23013 is a vulnerability found in BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.3, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, and 12.1.x before 12.1.5.3, where the Traffic Management Microkernel (TMM) may become unresponsive while handling Stream Control Transmission Protocol (SCTP) traffic under specific circumstances.

What is CVE-2021-23013?

The vulnerability sees TMM stop responding during the processing of SCTP traffic in affected BIG-IP versions, impacting TMM through a virtual server configured with an SCTP profile.

The Impact of CVE-2021-23013

The vulnerability can lead to denial of service (DoS) conditions due to TMM unresponsiveness when handling SCTP traffic, affecting the availability of services.

Technical Details of CVE-2021-23013

This section covers vital technical aspects of the CVE.

Vulnerability Description

The issue affects BIG-IP versions noted earlier, inducing TMM unresponsiveness during SCTP traffic processing.

Affected Systems and Versions

BIG-IP versions 16.0.x before 16.0.1.1, 15.1.x before 15.1.3, 14.1.x before 14.1.4, 13.1.x before 13.1.3.6, and 12.1.x before 12.1.5.3 are susceptible to this vulnerability.

Exploitation Mechanism

Exploitation primarily involves sending malicious SCTP traffic to a virtual server configured with an SCTP profile to trigger TMM unresponsiveness.

Mitigation and Prevention

Explore the essential steps to secure your systems against CVE-2021-23013.

Immediate Steps to Take

Update BIG-IP to non-vulnerable versions such as 16.0.1.1, 15.1.3, 14.1.4, 13.1.3.6, or 12.1.5.3.
Monitor network traffic for any unusual SCTP activity.

Long-Term Security Practices

Regularly check for updates and patches from the vendor.
Maintain a robust incident response plan to address vulnerabilities promptly.

Patching and Updates

Stay proactive in applying software patches and updates to mitigate security risks effectively.