CVE-2022-24331
📋 TL;DR
This vulnerability in JetBrains TeamCity allows attackers to impersonate users through GitLab authentication flaws. It affects TeamCity instances using GitLab authentication before version 2021.1.4. Attackers could gain unauthorized access to CI/CD pipelines and sensitive build artifacts.
💻 Affected Systems
- JetBrains TeamCity
📦 What is this software?
Teamcity by Jetbrains
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of CI/CD pipelines, unauthorized code deployment, theft of source code and credentials, and lateral movement to connected systems.
Likely Case
Unauthorized access to build environments, code repository access, and potential injection of malicious code into production deployments.
If Mitigated
Limited impact with proper network segmentation, strong authentication controls, and monitoring in place.
🎯 Exploit Status
Requires understanding of GitLab authentication flow and access to vulnerable TeamCity instance
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2021.1.4 and later
Vendor Advisory: https://blog.jetbrains.com/blog/2022/02/08/jetbrains-security-bulletin-q4-2021/
Restart Required: Yes
Instructions:
1. Backup TeamCity configuration and data. 2. Download TeamCity 2021.1.4 or later from JetBrains website. 3. Stop TeamCity service. 4. Install the updated version. 5. Restart TeamCity service. 6. Verify authentication functionality.
🔧 Temporary Workarounds
Disable GitLab Authentication
allTemporarily disable GitLab authentication until patching can be completed
Edit TeamCity configuration to remove GitLab authentication provider
Network Restriction
allRestrict TeamCity access to trusted IP addresses only
Configure firewall rules to limit TeamCity access to authorized networks
🧯 If You Can't Patch
- Implement strict network segmentation to isolate TeamCity from production environments
- Enable detailed authentication logging and implement real-time monitoring for suspicious authentication attempts
🔍 How to Verify
Check if Vulnerable:
Check TeamCity version in Administration → Server Administration → Server ConfigurationCheck Version:
Check TeamCity web interface or server logs for version informationVerify Fix Applied:
Verify version is 2021.1.4 or later and test GitLab authentication functionality📡 Detection & Monitoring
Log Indicators:
- Unusual authentication patterns from GitLab
- Multiple failed authentication attempts followed by success
- Authentication from unexpected IP addresses
Network Indicators:
- Unusual traffic patterns to TeamCity authentication endpoints
- Requests bypassing normal authentication flows
SIEM Query:
source="teamcity" AND (event_type="authentication" AND (result="failure" OR user_agent="GitLab")) | stats count by src_ip, user