CVE-2021-31549 : Exploit Details and Defense Strategies

An issue was discovered in the AbuseFilter extension for MediaWiki through version 1.35.2. The vulnerability allowed for the disclosure of suppressed MediaWiki usernames to unauthorized users.

Understanding CVE-2021-31549

This CVE identifies a security flaw in the AbuseFilter extension affecting MediaWiki installations up to version 1.35.2.

What is CVE-2021-31549?

The vulnerability in the Special:AbuseFilter/examine form of MediaWiki enables unauthorized access to suppressed usernames.

The Impact of CVE-2021-31549

This security issue could lead to the exposure of sensitive information, potentially compromising user privacy and security.

Technical Details of CVE-2021-31549

The following technical aspects shed light on the nature of the vulnerability.

Vulnerability Description

The flaw in the AbuseFilter extension permits unprivileged users to view suppressed usernames in MediaWiki instances.

Affected Systems and Versions

MediaWiki installations up to version 1.35.2 are impacted by this vulnerability.

Exploitation Mechanism

Unauthorized users can exploit the Special:AbuseFilter/examine form to access and view suppressed MediaWiki usernames.

Mitigation and Prevention

Protecting your systems from CVE-2021-31549 is crucial to maintaining security.

Immediate Steps to Take

Restrict access to the affected form and investigate any unauthorized access or leaks of sensitive information.

Long-Term Security Practices

Regularly update MediaWiki installations to the latest version and monitor for any signs of unauthorized access.

Patching and Updates

Apply security patches released by MediaWiki promptly to address this vulnerability and enhance system security.