How to fix CVE-2024-27198 – Step-by-Step Guide
CVE-2024-27198 is a critical authentication bypass vulnerability affecting JetBrains TeamCity. This flaw allows unauthenticated attackers to gain full administrative access and execute arbitrary code on the server. Immediate patching is crucial to prevent server compromise.
What is JetBrains TeamCity Authentication Bypass?
CVE-2024-27198 is an authentication bypass in JetBrains TeamCity versions prior to 2023.11.4. It enables unauthenticated threat actors to exploit a web UI weakness, bypassing security controls. This grants them the ability to create new administrator accounts and execute arbitrary code on the vulnerable TeamCity server.
Impact and Risks for your Infrastructure
The impact of CVE-2024-27198 is severe, leading to complete server takeover. Attackers can create admin accounts, execute arbitrary builds, access sensitive source code repositories, and exfiltrate critical secrets. This poses a significant risk to CI/CD pipelines and intellectual property.
Step-by-Step Mitigation Guide
To mitigate CVE-2024-27198, immediately upgrade your JetBrains TeamCity instance to version 2023.11.4 or higher. Verify the upgrade by checking the TeamCity server version in the administration panel. Ensure all instances are updated to prevent unauthenticated access and potential server compromise.
- 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.