CVE-2025-59456
📋 TL;DR
This vulnerability allows attackers to perform path traversal attacks during project archive uploads in JetBrains TeamCity, potentially enabling unauthorized file access or manipulation. Organizations using TeamCity versions before 2025.07.2 are affected by this security flaw.
💻 Affected Systems
- JetBrains TeamCity
📦 What is this software?
Teamcity by Jetbrains
⚠️ Risk & Real-World Impact
Worst Case
Attackers could overwrite critical system files, execute arbitrary code, or access sensitive configuration data by exploiting the path traversal during archive upload.
Likely Case
Unauthorized file read/write operations within the TeamCity server's filesystem, potentially exposing sensitive project data or configuration files.
If Mitigated
With proper access controls and monitoring, impact would be limited to isolated file system access within TeamCity's restricted directories.
🎯 Exploit Status
Exploitation requires authenticated access with project upload permissions; path traversal techniques must bypass validation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2025.07.2 or later
Vendor Advisory: https://www.jetbrains.com/privacy-security/issues-fixed/
Restart Required: No
Instructions:
1. Backup TeamCity configuration and data. 2. Download TeamCity 2025.07.2 or later from JetBrains website. 3. Follow JetBrains upgrade documentation for your deployment method. 4. Verify successful upgrade and functionality.
🔧 Temporary Workarounds
Restrict Project Upload Permissions
allTemporarily limit upload capabilities to trusted administrators only
TeamCity Admin → Users → Edit Roles → Remove 'Upload project archive' permissions from non-admin users
🧯 If You Can't Patch
- Implement strict access controls limiting project upload capabilities to essential personnel only
- Monitor TeamCity logs for unusual upload activities and implement file integrity monitoring on critical directories
🔍 How to Verify
Check if Vulnerable:
Check TeamCity version in Administration → Server Administration → Server Health → Version InformationCheck Version:
Check TeamCity web interface or server logs for version informationVerify Fix Applied:
Verify version is 2025.07.2 or later and test project archive upload functionality with path traversal attempts📡 Detection & Monitoring
Log Indicators:
- Unusual file paths in upload logs
- Failed path traversal attempts in server logs
- Multiple archive upload attempts from single user
Network Indicators:
- Unusual upload patterns to TeamCity endpoints
- Large archive uploads with suspicious filenames
SIEM Query:
source="teamcity" AND (event="upload" OR event="archive") AND (path=".." OR path="../" OR filename CONTAINS "/" OR filename CONTAINS "\")