CVE-2022-39193 : Security Advisory and Response

An issue was discovered in the CheckUser extension for MediaWiki through 1.39.x that can expose sensitive information to unauthorized users.

Understanding CVE-2022-39193

This CVE report highlights a security vulnerability in the CheckUser extension of MediaWiki that could lead to the exposure of performer information.

What is CVE-2022-39193?

CVE-2022-39193 is a security flaw in the CheckUser extension for MediaWiki versions up to 1.39.x. The vulnerability allows various components of the extension to reveal information about the performer of edits and logged actions, which should only be accessible to users with specific rights.

The Impact of CVE-2022-39193

The impact of this CVE is the potential exposure of sensitive data related to user actions within MediaWiki, compromising user privacy and security.

Technical Details of CVE-2022-39193

This section covers the technical aspects of the CVE, including vulnerability description, affected systems and versions, and exploitation mechanism.

Vulnerability Description

The CheckUser extension in MediaWiki before version 1.39.x may disclose performer information on edits and actions, allowing unauthorized access to sensitive data that should be restricted.

Affected Systems and Versions

All versions of MediaWiki up to 1.39.x are affected by this vulnerability when using the CheckUser extension.

Exploitation Mechanism

Unauthorized users can exploit this vulnerability in the CheckUser extension to access information intended only for users with suppression rights.

Mitigation and Prevention

To address CVE-2022-39193, immediate steps should be taken to mitigate the risk and prevent further exploitation.

Immediate Steps to Take

Update MediaWiki to the latest version to patch the vulnerability.
Review and restrict access to sensitive information within MediaWiki.

Long-Term Security Practices

Regularly monitor security updates and patches for MediaWiki and its extensions.
Educate users on data privacy and access control within the platform.

Patching and Updates

Ensure timely installation of security patches and updates provided by MediaWiki to address known vulnerabilities.