CVE-2021-35197 : Vulnerability Insights and Analysis

In MediaWiki before 1.31.15, 1.32.x through 1.35.x before 1.35.3, and 1.36.x before 1.36.1, bots have certain unintended API access allowing them to bypass "sitewide block" restrictions.

Understanding CVE-2021-35197

This CVE impacts MediaWiki versions before 1.31.15, 1.32.x through 1.35.x before 1.35.3, and 1.36.x before 1.36.1, enabling bots to perform actions they should be restricted from.

What is CVE-2021-35197?

In MediaWiki versions mentioned, bots with "sitewide block" can still perform page purging through the MediaWiki Action API.

The Impact of CVE-2021-35197

The vulnerability allows bot accounts to bypass sitewide block restrictions, potentially leading to unauthorized actions and security breaches.

Technical Details of CVE-2021-35197

This section provides a detailed overview of the vulnerability.

Vulnerability Description

Bots in affected MediaWiki versions can continue to purge pages even with a sitewide block applied, contrary to intended restrictions.

Affected Systems and Versions

MediaWiki versions before 1.31.15, 1.32.x through 1.35.x before 1.35.3, and 1.36.x before 1.36.1 are impacted by this CVE.

Exploitation Mechanism

By exploiting this vulnerability, bot accounts can evade sitewide block restrictions and still perform purging actions through the MediaWiki Action API.

Mitigation and Prevention

Protecting systems from CVE-2021-35197 is essential to maintain security.

Immediate Steps to Take

Update MediaWiki to versions 1.31.15, 1.35.3, or 1.36.1 to mitigate the vulnerability and prevent unauthorized API access by bots.

Long-Term Security Practices

Regularly monitor and update MediaWiki installations to address security vulnerabilities promptly and enhance overall system protection.

Patching and Updates

Stay informed about security advisories and apply patches released by MediaWiki to address known vulnerabilities and improve system security.