CVE-2021-30641 Explained : Impact and Mitigation

Apache HTTP Server versions 2.4.39 to 2.4.46 are affected by a vulnerability that causes unexpected URL matching behavior with 'MergeSlashes OFF'. This CVE was discovered by Christoph Anton Mitterer.

Understanding CVE-2021-30641

This section will cover what CVE-2021-30641 entails and its impact on affected systems.

What is CVE-2021-30641?

CVE-2021-30641 refers to the unexpected URL matching behavior found in Apache HTTP Server versions 2.4.39 to 2.4.46 when 'MergeSlashes' functionality is disabled.

The Impact of CVE-2021-30641

The vulnerability can allow an attacker to exploit the unexpected URL matching behavior, potentially leading to security compromises on the affected systems.

Technical Details of CVE-2021-30641

In this section, we will delve into the specifics of the CVE, including the vulnerability description, affected systems, and exploitation mechanism.

Vulnerability Description

The vulnerability in Apache HTTP Server versions 2.4.39 to 2.4.46 results in unexpected URL matching behavior when 'MergeSlashes OFF' configuration is used.

Affected Systems and Versions

The vulnerability impacts Apache HTTP Server versions 2.4.39 to 2.4.46 that have 'MergeSlashes OFF'.

Exploitation Mechanism

Attackers can exploit this vulnerability to manipulate URL matching, potentially bypassing security measures.

Mitigation and Prevention

This section will provide insights into how to mitigate the risks associated with CVE-2021-30641 and prevent future occurrences.

Immediate Steps to Take

Users are advised to update their Apache HTTP Server to a patched version that addresses the vulnerability. Additionally, enabling 'MergeSlashes' can help mitigate the issue.

Long-Term Security Practices

Regularly monitor security advisories from Apache Software Foundation and apply security updates promptly to prevent exploitation of known vulnerabilities.

Patching and Updates

Stay informed about the latest patches and updates released by Apache Software Foundation to protect your systems from potential security threats.