CVE-2021-45471 Explained : Impact and Mitigation

In MediaWiki through 1.37, blocked IP addresses are allowed to edit EntitySchema items.

Understanding CVE-2021-45471

In this CVE, there is a vulnerability in MediaWiki that permits blocked IP addresses to edit EntitySchema items.

What is CVE-2021-45471?

This CVE identifies a security issue in MediaWiki versions up to 1.37 where IP addresses that are supposed to be blocked have the ability to make changes to EntitySchema items.

The Impact of CVE-2021-45471

The vulnerability allows unauthorized users, specifically blocked IP addresses, to modify EntitySchema items, potentially leading to unauthorized changes or disruptions.

Technical Details of CVE-2021-45471

MediaWiki is affected by a specific vulnerability that allows blocked IP addresses to edit EntitySchema items.

Vulnerability Description

The vulnerable version of MediaWiki (up to 1.37) fails to restrict blocked IP addresses from editing EntitySchema items, providing a pathway for unauthorized modifications.

Affected Systems and Versions

Product: MediaWiki
Vendor: Wikimedia Foundation
Versions: All versions up to 1.37

Exploitation Mechanism

The vulnerability is exploited when a blocked IP address gains access to the MediaWiki platform and edits EntitySchema items, bypassing the intended restrictions.

Mitigation and Prevention

To address CVE-2021-45471, consider the following steps:

Immediate Steps to Take

Implement IP blocking mechanisms to prevent unauthorized editing.
Regularly monitor and review access logs for suspicious activities.
Apply the latest updates or patches from the vendor.

Long-Term Security Practices

Conduct regular security audits to identify and mitigate vulnerabilities.
Educate users on safe editing practices and security awareness.
Utilize web application firewalls to enhance security posture.

Patching and Updates

Update MediaWiki to version 1.38 or newer to fix the vulnerability and prevent blocked IP addresses from editing EntitySchema items.