CVE-2020-35623 : Security Advisory and Response

An issue was discovered in the CasAuth extension for MediaWiki through 1.35.1, allowing user impersonation due to improper username validation.

Understanding CVE-2020-35623

This CVE identifies a vulnerability in the CasAuth extension for MediaWiki that could lead to user impersonation.

What is CVE-2020-35623?

The vulnerability in the CasAuth extension for MediaWiki through version 1.35.1 enables user impersonation through manipulation of certain characters in a username, potentially allowing unauthorized access.

The Impact of CVE-2020-35623

The vulnerability could result in an ordinary user logging in as a "bureaucrat user" with a similar username, exploiting bidirectional override symbols or blank spaces.

Technical Details of CVE-2020-35623

This section provides more technical insights into the CVE.

Vulnerability Description

The issue arises from improper username validation in the CasAuth extension for MediaWiki, facilitating user impersonation through character manipulation.

Affected Systems and Versions

Product: MediaWiki
Versions affected: Through 1.35.1

Exploitation Mechanism

The vulnerability allows an ordinary user to login as a privileged user by exploiting character manipulations in the username.

Mitigation and Prevention

Protecting systems from CVE-2020-35623 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update the CasAuth extension to the latest secure version.
Monitor user logins for any suspicious activity.

Long-Term Security Practices

Implement strict username validation mechanisms.
Conduct regular security audits to identify and address similar vulnerabilities.
Educate users on secure login practices.
Consider implementing multi-factor authentication.

Patching and Updates

Apply patches provided by MediaWiki promptly to address the vulnerability and prevent unauthorized access.