CVE-2020-5935 : What You Need to Know

A vulnerability on BIG-IP versions 15.1.0-15.1.0.5, 14.1.0-14.1.2.3, and 13.1.0-13.1.3.3 can lead to DoS due to TMM producing a core file when handling MQTT traffic.

Understanding CVE-2020-5935

This CVE involves a specific vulnerability in the handling of MQTT traffic on certain versions of BIG-IP.

What is CVE-2020-5935?

The vulnerability occurs when TMM processes MQTT traffic through a BIG-IP virtual server with an MQTT profile and an iRule manipulating the traffic, potentially resulting in a denial of service (DoS) situation.

The Impact of CVE-2020-5935

The vulnerability can lead to TMM generating a core file, causing service disruption and potential downtime for affected systems.

Technical Details of CVE-2020-5935

This section provides more technical insights into the vulnerability.

Vulnerability Description

The issue arises in the handling of MQTT traffic on specific versions of BIG-IP, triggering TMM to create a core file.

Affected Systems and Versions

BIG-IP versions 15.1.0-15.1.0.5
BIG-IP versions 14.1.0-14.1.2.3
BIG-IP versions 13.1.0-13.1.3.3

Exploitation Mechanism

The vulnerability is exploited by sending MQTT traffic through a virtual server with specific configurations that trigger the TMM to crash and generate a core file.

Mitigation and Prevention

To address CVE-2020-5935, follow these mitigation strategies:

Immediate Steps to Take

Apply the necessary patches provided by the vendor.
Monitor network traffic for any suspicious activity related to MQTT.

Long-Term Security Practices

Regularly update and patch BIG-IP systems to prevent known vulnerabilities.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Ensure timely installation of security patches and updates to mitigate the risk of exploitation.