CVE-2023-34243 : Security Advisory and Response

A security advisory has been issued for Windows user name disclosure in TGstation.

Understanding CVE-2023-34243

This CVE describes an information disclosure vulnerability in TGstation that could allow an attacker to discover a Windows user's username.

What is CVE-2023-34243?

TGstation, a toolset to manage production BYOND servers, has a vulnerability in versions prior to 5.12.5. Attackers could identify Windows usernames by brute-forcing the login endpoint with an invalid password.

The Impact of CVE-2023-34243

The exposure of Windows usernames could lead to unauthorized access, privacy breaches, and potential security risks for affected users.

Technical Details of CVE-2023-34243

This section details the vulnerability, affected systems, and the exploitation mechanism.

Vulnerability Description

In affected versions, a distinct response was generated when a valid Windows logon was found, allowing attackers to identify user accounts through brute force.

Affected Systems and Versions

The vulnerability affects tgstation-server versions ranging from >= 4.0.0 to < 5.12.5.

Exploitation Mechanism

Attackers exploited the login endpoint by sending invalid passwords to reveal valid Windows logons.

Mitigation and Prevention

Learn how to protect systems and mitigate the risks associated with CVE-2023-34243.

Immediate Steps to Take

Users are advised to upgrade to version 5.12.5 to address the vulnerability. Alternatively, rate-limiting API calls in front of TGStation with tools like fail2ban can offer temporary mitigation.

Long-Term Security Practices

Implement robust security measures, regularly update software, and conduct security audits to prevent similar vulnerabilities in the future.

Patching and Updates

Stay informed about security patches and updates released by TGstation to ensure protection against emerging threats.