How to fix CVE-2024-27198 – Step-by-Step Guide
CVE-2024-27198 addresses a critical authentication bypass vulnerability in JetBrains TeamCity. This flaw allows unauthenticated attackers to gain full administrative access to the server. It poses a severe and immediate risk to affected TeamCity instances.
What is JetBrains TeamCity Authentication Bypass?
This is an authentication bypass vulnerability affecting JetBrains TeamCity versions prior to 2023.11.4. It enables unauthenticated threat actors to exploit the web UI. By doing so, they can bypass authentication mechanisms and execute arbitrary code, effectively gaining full control over the TeamCity server.
Impact and Risks for your Infrastructure
The primary impact is a complete server takeover by unauthenticated attackers. This allows them to create rogue admin accounts, execute arbitrary builds, and access all sensitive source code. Furthermore, attackers can exfiltrate secrets and credentials stored within TeamCity, leading to severe data breaches.
Step-by-Step Mitigation Guide
To mitigate CVE-2024-27198, immediately upgrade your JetBrains TeamCity instance to version 2023.11.4 or newer. Verify the update by checking the TeamCity server version in the administration panel. Ensure all instances are running the fixed version to prevent exploitation.
- 1Update TeamCity to 2023.11.4 or later immediately.
- 2Restrict TeamCity web UI access to trusted IP ranges only.
- 3Audit TeamCity user accounts and remove any unauthorized admin accounts.
- 4Rotate all credentials, tokens, and VCS passwords stored in TeamCity.
- 5Review build logs for signs of exploitation (unauthorized builds, new admin accounts).
- 6Enable TeamCity audit logs and set up alerts for admin account creation.