CVE-2021-31546 Explained : Impact and Mitigation

An issue was discovered in the AbuseFilter extension for MediaWiki through version 1.35.2. The vulnerability incorrectly logged sensitive suppression deletions, exposing information that should not have been visible to users with access to view AbuseFilter log data.

Understanding CVE-2021-31546

This section provides insights into the impact, technical details, and mitigation strategies for CVE-2021-31546.

What is CVE-2021-31546?

CVE-2021-31546 is a security vulnerability identified in the AbuseFilter extension for MediaWiki up to version 1.35.2. It allows unauthorized access to sensitive suppression deletion logs.

The Impact of CVE-2021-31546

The vulnerability allows users with access to view the AbuseFilter log data to see sensitive suppression deletions which should have remained hidden. This disclosure of information can lead to data leaks and privacy breaches.

Technical Details of CVE-2021-31546

Let's delve deeper into the technical aspects of the CVE-2021-31546 vulnerability.

Vulnerability Description

The flaw in the AbuseFilter extension incorrectly logs sensitive suppression deletions, compromising data confidentiality.

Affected Systems and Versions

All instances of MediaWiki through version 1.35.2 that have the AbuseFilter extension enabled are vulnerable to CVE-2021-31546.

Exploitation Mechanism

Attackers with access to the AbuseFilter log data can exploit this vulnerability to gain unauthorized visibility into suppression deletions.

Mitigation and Prevention

Discover the immediate steps to secure your system and best practices for long-term security.

Immediate Steps to Take

Update MediaWiki to version 1.35.3 or higher to patch the vulnerability and prevent unauthorized access to suppression deletion logs.

Long-Term Security Practices

Regularly monitor and audit access to sensitive data and review log visibility permissions to avoid similar security incidents in the future.

Patching and Updates

Stay informed about security patches and updates for MediaWiki to promptly address any new vulnerabilities and enhance system security.