CVE-2022-24342
📋 TL;DR
This vulnerability in JetBrains TeamCity allows attackers to inject malicious URLs that can lead to Cross-Site Request Forgery (CSRF) attacks. It affects TeamCity servers running versions before 2021.2.1, potentially allowing unauthorized actions to be performed on behalf of authenticated users.
💻 Affected Systems
- JetBrains TeamCity
📦 What is this software?
Teamcity by Jetbrains
⚠️ Risk & Real-World Impact
Worst Case
Attackers could perform administrative actions, modify configurations, create/delete projects, or execute arbitrary code on the TeamCity server by tricking authenticated administrators into clicking malicious links.
Likely Case
Attackers could perform unauthorized actions such as creating/deleting build configurations, modifying user permissions, or accessing sensitive project data through CSRF attacks.
If Mitigated
With proper CSRF protections and user awareness, impact is limited to unsuccessful attack attempts with no data compromise.
🎯 Exploit Status
Exploitation requires social engineering to trick authenticated users into clicking malicious URLs. No authentication bypass is needed if user is already logged in.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2021.2.1 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 2021.2.1 or later from JetBrains website. 3. Stop TeamCity service. 4. Install the updated version. 5. Restart TeamCity service. 6. Verify successful upgrade.
🔧 Temporary Workarounds
CSRF Token Implementation
allImplement custom CSRF tokens for sensitive operations if unable to patch immediately
Access Restriction
allRestrict TeamCity access to trusted networks only and implement strict URL validation
🧯 If You Can't Patch
- Implement network segmentation to isolate TeamCity from untrusted networks
- Enable strict SameSite cookie policies and implement additional CSRF protections
🔍 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 2021.2.1 or later in Administration → Server Administration → Server Health → Version📡 Detection & Monitoring
Log Indicators:
- Unusual URL patterns in access logs
- Multiple failed CSRF token validations
- Unexpected administrative actions from unusual IPs
Network Indicators:
- HTTP requests with suspicious URL parameters to TeamCity endpoints
- Unusual outbound connections from TeamCity server
SIEM Query:
source="teamcity.log" AND ("CSRF" OR "invalid token" OR "unauthorized action")