CVE-2021-44855 : What You Need to Know

An issue was discovered in MediaWiki before 1.35.5, 1.36.x before 1.36.3, and 1.37.x before 1.37.1. There is Blind Stored XSS via a URL to the Upload Image feature.

Understanding CVE-2021-44855

This CVE involves a Blind Stored Cross-Site Scripting (XSS) vulnerability in specific versions of MediaWiki.

What is CVE-2021-44855?

Blind Stored XSS allows an attacker to inject malicious scripts into a webpage, affecting users who interact with the compromised content.

The Impact of CVE-2021-44855

The vulnerability could be exploited by an attacker to execute unauthorized actions in the context of a user's browser session, potentially leading to data theft or manipulation.

Technical Details of CVE-2021-44855

This section delves into the specifics of the CVE.

Vulnerability Description

The Blind Stored XSS vulnerability affects MediaWiki versions prior to 1.35.5, 1.36.3, and 1.37.1, enabling malicious script injection via the Upload Image feature.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions: All versions prior to 1.35.5, 1.36.3, and 1.37.1

Exploitation Mechanism

Attackers can craft a URL pointing to the Upload Image feature, embedding malicious scripts that persist within the system, waiting to execute on user interaction.

Mitigation and Prevention

Protective measures against CVE-2021-44855 are vital to prevent exploitation.

Immediate Steps to Take

Update MediaWiki to versions 1.35.5, 1.36.3, or 1.37.1
Disable the Upload Image feature if immediate update is not feasible

Long-Term Security Practices

Conduct regular security audits and code reviews
Train users on recognizing and reporting suspicious URLs or content

Patching and Updates

Apply security patches promptly to ensure that software vulnerabilities are addressed and system integrity is maintained.