CVE-2025-54530
📋 TL;DR
This vulnerability in JetBrains TeamCity allows attackers to escalate privileges due to incorrect directory permissions. It affects all TeamCity installations before version 2025.07. Attackers could gain unauthorized access to sensitive system resources.
💻 Affected Systems
- JetBrains TeamCity
📦 What is this software?
Teamcity by Jetbrains
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise where attackers gain administrative control over the TeamCity server, potentially accessing build secrets, source code, and deploying malicious artifacts.
Likely Case
Unauthorized access to sensitive configuration files, build artifacts, or credentials stored in TeamCity directories, leading to data exposure or further lateral movement.
If Mitigated
Limited impact with proper network segmentation and access controls, though directory permission issues could still expose some sensitive information.
🎯 Exploit Status
Exploitation requires some level of initial access to the system. The directory permission misconfiguration makes privilege escalation straightforward once initial access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2025.07
Vendor Advisory: https://www.jetbrains.com/privacy-security/issues-fixed/
Restart Required: Yes
Instructions:
1. Backup your TeamCity installation and data. 2. Download TeamCity 2025.07 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
Manual Directory Permission Fix
linuxManually adjust directory permissions to restrict access to authorized users only
chmod 750 /path/to/teamcity/directories
chown teamcity:teamcity /path/to/teamcity/directories
Windows ACL Restriction
windowsSet restrictive ACLs on TeamCity directories to prevent unauthorized access
icacls "C:\Program Files\TeamCity" /inheritance:r /grant:r "TeamCityUser:(OI)(CI)F" /grant:r "SYSTEM:(OI)(CI)F"
🧯 If You Can't Patch
- Implement strict network segmentation to isolate TeamCity servers from other critical systems
- Enable detailed audit logging for all TeamCity directory access attempts and monitor for suspicious activity
🔍 How to Verify
Check if Vulnerable:
Check TeamCity version via Administration → Server Administration → Server Health → Version Information. If version is below 2025.07, the system is vulnerable.Check Version:
On TeamCity server, check the version in the admin interface or examine the TeamCity installation directory for version files.Verify Fix Applied:
Verify version is 2025.07 or higher in TeamCity admin interface. Additionally, check directory permissions on TeamCity installation directories to ensure proper restrictions.📡 Detection & Monitoring
Log Indicators:
- Unauthorized access attempts to TeamCity directories
- Permission change events on TeamCity system files
- Unusual process execution from TeamCity directories
Network Indicators:
- Unexpected outbound connections from TeamCity server
- Unusual authentication patterns to TeamCity services
SIEM Query:
source="teamcity.logs" AND (event_type="permission_denied" OR event_type="unauthorized_access")