CVE-2020-5883 : Security Advisory and Response

This CVE involves a vulnerability in F5 BIG-IP versions 13.1.0-13.1.3.1, 14.0.0-14.0.1, 14.1.0-14.1.2.3, and 15.0.0-15.0.1 that leads to a memory leak when handling POST requests.

Understanding CVE-2020-5883

This section provides insights into the nature and impact of the CVE.

What is CVE-2020-5883?

CVE-2020-5883 is a Denial of Service (DoS) vulnerability affecting F5 BIG-IP devices running specific versions. It occurs when a virtual server is configured with an HTTP explicit proxy and an attached HTTP_PROXY_REQUEST iRule, causing a memory leak when processing POST requests.

The Impact of CVE-2020-5883

The vulnerability allows malicious actors to exploit the memory leak, potentially leading to a DoS condition by consuming excessive system resources and causing service disruption.

Technical Details of CVE-2020-5883

Explore the technical aspects of the CVE in this section.

Vulnerability Description

The issue arises in BIG-IP versions 13.1.0-13.1.3.1, 14.0.0-14.0.1, 14.1.0-14.1.2.3, and 15.0.0-15.0.1 due to improper handling of POST requests, resulting in a memory leak.

Affected Systems and Versions

BIG-IP 15.0.0-15.0.1
BIG-IP 14.1.0-14.1.2.3
BIG-IP 14.0.0-14.0.1
BIG-IP 13.1.0-13.1.3.1

Exploitation Mechanism

Attackers can exploit this vulnerability by sending crafted POST requests to a virtual server with specific configurations, triggering the memory leak.

Mitigation and Prevention

Learn how to address and prevent the CVE in this section.

Immediate Steps to Take

Apply the necessary patches provided by F5 Networks to mitigate the vulnerability.
Monitor system resources for any unusual spikes in memory usage.

Long-Term Security Practices

Regularly update and patch F5 BIG-IP devices to protect against known vulnerabilities.
Implement network segmentation and access controls to limit exposure to potential attacks.
Conduct regular security assessments and audits to identify and address security gaps.

Patching and Updates

F5 Networks has released patches to address CVE-2020-5883. Ensure timely application of these patches to safeguard your systems.