CVE-2025-24461
📋 TL;DR
This vulnerability in JetBrains TeamCity allows unauthorized decryption of connection secrets via the Test Connection endpoint. Attackers with access to the endpoint can potentially retrieve sensitive credentials stored in the system. All TeamCity instances running vulnerable versions are affected.
💻 Affected Systems
- JetBrains TeamCity
📦 What is this software?
Teamcity by Jetbrains
⚠️ Risk & Real-World Impact
Worst Case
Attackers could decrypt and exfiltrate all connection secrets (database credentials, API keys, SSH keys) leading to complete compromise of connected systems and data breaches.
Likely Case
Unauthorized users with access to the Test Connection endpoint could retrieve specific connection credentials they target, potentially gaining access to external systems.
If Mitigated
With proper access controls and network segmentation, impact is limited to authorized users who already have some level of access to the system.
🎯 Exploit Status
Exploitation requires access to the Test Connection endpoint, which typically requires authentication. The vulnerability itself is straightforward to exploit once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2024.12.1
Vendor Advisory: https://www.jetbrains.com/privacy-security/issues-fixed/
Restart Required: Yes
Instructions:
1. Backup your TeamCity installation and data. 2. Download TeamCity 2024.12.1 or later from the official JetBrains website. 3. Follow the TeamCity upgrade documentation for your specific installation type. 4. Restart the TeamCity service after upgrade completion.
🔧 Temporary Workarounds
Restrict Test Connection Endpoint Access
allLimit access to the Test Connection endpoint using network controls or application firewalls
Review and Rotate Connection Secrets
allAudit all stored connection secrets and rotate credentials for critical systems
🧯 If You Can't Patch
- Implement strict network segmentation to isolate TeamCity from production systems
- Enable detailed logging and monitoring for Test Connection endpoint access
🔍 How to Verify
Check if Vulnerable:
Check TeamCity version in Administration → Server Administration → Server Health → VersionCheck Version:
Check TeamCity web interface at Administration → Server Administration → Server Health → VersionVerify Fix Applied:
Verify version is 2024.12.1 or later in the same location📡 Detection & Monitoring
Log Indicators:
- Unusual access patterns to Test Connection endpoint
- Multiple failed or successful Test Connection attempts from single user
Network Indicators:
- Unusual outbound connections from TeamCity server following Test Connection requests
SIEM Query:
source="teamcity" AND (uri_path="/app/rest/debug/connectionTest" OR message="Test Connection")