CVE-2020-5919 : Exploit Details and Defense Strategies

In versions 15.1.0-15.1.0.4 of BIG-IP APM, a vulnerability exists that may cause the Traffic Management Microkernel (TMM) to stop responding when rendering certain session variables by UI-based agents in an access profile configured with Modern customization.

Understanding CVE-2020-5919

What is CVE-2020-5919?

CVE-2020-5919 is a Denial of Service (DoS) vulnerability affecting BIG-IP APM versions 15.1.0-15.1.0.4.

The Impact of CVE-2020-5919

This vulnerability can lead to the TMM becoming unresponsive, potentially disrupting network traffic and services.

Technical Details of CVE-2020-5919

Vulnerability Description

In versions 15.1.0-15.1.0.4, certain session variables rendered by BIG-IP APM UI-based agents in a specific access profile configuration can trigger the TMM to stop responding.

Affected Systems and Versions

Product: BIG-IP APM
Versions: 15.1.0-15.1.0.4

Exploitation Mechanism

The vulnerability is exploited by manipulating session variables through UI-based agents in an access profile with Modern customization, causing the TMM to crash.

Mitigation and Prevention

Immediate Steps to Take

Apply the vendor-supplied patches or updates for the affected versions.
Monitor network traffic for any signs of abnormal behavior that may indicate exploitation.

Long-Term Security Practices

Regularly update and patch all software and systems to prevent known vulnerabilities.
Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

F5 has provided patches to address this vulnerability. Ensure timely application of these patches to secure the system.