CVE-2024-36376
📋 TL;DR
This CVE describes an authorization bypass vulnerability in JetBrains TeamCity where users could perform actions beyond their assigned permissions. It affects TeamCity instances before version 2024.03.2. This could allow unauthorized access to sensitive functionality or data.
💻 Affected Systems
- JetBrains TeamCity
📦 What is this software?
Teamcity by Jetbrains
⚠️ Risk & Real-World Impact
Worst Case
An authenticated user could escalate privileges to administrative level, potentially gaining full control over the TeamCity instance, accessing sensitive build artifacts, modifying configurations, or deploying malicious code.
Likely Case
Users with limited permissions could access functionality they shouldn't have, such as viewing sensitive build configurations, triggering unauthorized builds, or accessing restricted project data.
If Mitigated
With proper network segmentation and monitoring, unauthorized actions could be detected and contained before significant damage occurs.
🎯 Exploit Status
Exploitation requires authenticated access but the specific bypass mechanism is not publicly documented.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2024.03.2
Vendor Advisory: https://www.jetbrains.com/privacy-security/issues-fixed/
Restart Required: Yes
Instructions:
1. Backup your TeamCity instance. 2. Download TeamCity 2024.03.2 or later from the JetBrains website. 3. Follow the TeamCity upgrade documentation for your installation method. 4. Restart the TeamCity service after upgrade.
🔧 Temporary Workarounds
Temporary access restrictions
allImplement additional network-level access controls to limit TeamCity access to only authorized users
Enhanced monitoring
allIncrease logging and monitoring of user actions within TeamCity to detect unauthorized activities
🧯 If You Can't Patch
- Implement strict network segmentation to isolate TeamCity from sensitive systems
- Enable detailed audit logging and implement real-time alerting for suspicious user activities
🔍 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 HealthVerify Fix Applied:
Verify version is 2024.03.2 or later in the same location📡 Detection & Monitoring
Log Indicators:
- Unusual user permission changes
- Users accessing functionality outside their normal role patterns
- Failed authorization attempts followed by successful access
Network Indicators:
- Unusual API calls from non-admin users to administrative endpoints
SIEM Query:
source="teamcity" AND (event_type="permission_violation" OR user_action="unauthorized_access")