CVE-2020-11993 : Security Advisory and Response

Apache HTTP Server versions 2.4.20 to 2.4.43 are affected by a vulnerability related to the HTTP/2 module, potentially leading to memory pool issues.

Understanding CVE-2020-11993

This CVE involves a specific issue in Apache HTTP Server versions 2.4.20 to 2.4.43 that can impact memory usage due to incorrect logging statements under certain conditions.

What is CVE-2020-11993?

CVE-2020-11993 is a vulnerability in Apache HTTP Server versions 2.4.20 to 2.4.43 that arises when trace/debug is enabled for the HTTP/2 module. This can result in logging statements being made on the wrong connection, causing concurrent memory pool usage.

The Impact of CVE-2020-11993

The vulnerability can lead to memory pool issues due to incorrect logging statements, potentially affecting the performance and stability of the Apache HTTP Server.

Technical Details of CVE-2020-11993

Apache HTTP Server versions 2.4.20 to 2.4.43 are susceptible to the following technical aspects:

Vulnerability Description

When trace/debug is enabled for the HTTP/2 module, logging statements may occur on the wrong connection, leading to concurrent memory pool usage.

Affected Systems and Versions

Product: Apache HTTP Server
Versions: 2.4.20 to 2.4.43

Exploitation Mechanism

The vulnerability can be exploited by enabling trace/debug for the HTTP/2 module under specific traffic edge patterns, triggering incorrect logging statements.

Mitigation and Prevention

To address CVE-2020-11993, consider the following mitigation strategies:

Immediate Steps to Take

Configure the LogLevel of mod_http2 above "info" to mitigate the vulnerability for unpatched servers.

Long-Term Security Practices

Regularly monitor and apply security updates for Apache HTTP Server.

Patching and Updates

Apply the necessary patches and updates provided by Apache to address the vulnerability effectively.