CVE-2021-44659
📋 TL;DR
CVE-2021-44659 is a Server-Side Request Forgery (SSRF) vulnerability in GoCD server version 21.3.0 that allows authenticated administrators to abuse pipeline creation functionality to make unintended outbound HTTP requests. This could enable attackers to interact with internal systems or bypass network controls. Only GoCD servers with admin users are affected.
💻 Affected Systems
- GoCD Server
📦 What is this software?
Gocd by Thoughtworks
⚠️ Risk & Real-World Impact
Worst Case
Attackers could pivot to internal systems, access cloud metadata services, or perform port scanning of internal networks through the vulnerable server.
Likely Case
Information disclosure from internal services, interaction with internal APIs, or limited internal network reconnaissance.
If Mitigated
Minimal impact if proper network segmentation and admin user controls are implemented.
🎯 Exploit Status
Exploitation requires admin credentials. Public proof-of-concept code is available on GitHub.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: N/A
Vendor Advisory: N/A
Restart Required: No
Instructions:
No official patch available as vendor disputes this is a vulnerability. Consider upgrading to latest GoCD version and reviewing configuration.
🔧 Temporary Workarounds
Restrict Admin Access
allLimit admin user accounts to trusted personnel only and implement strong authentication controls.
Network Segmentation
allImplement network controls to restrict GoCD server outbound connections to only necessary endpoints.
🧯 If You Can't Patch
- Implement strict access controls for admin accounts with multi-factor authentication
- Deploy network monitoring to detect unusual outbound requests from GoCD server
🔍 How to Verify
Check if Vulnerable:
Check GoCD server version. If running version 21.3.0, the system is potentially vulnerable if admin accounts exist.Check Version:
Check GoCD server web interface or configuration files for version information.Verify Fix Applied:
Upgrade to a version later than 21.3.0 and verify admin users cannot make unintended outbound requests through pipeline creation.📡 Detection & Monitoring
Log Indicators:
- Unusual pipeline creation events
- Outbound HTTP requests to unexpected internal IPs
Network Indicators:
- HTTP requests from GoCD server to internal services not typically accessed
SIEM Query:
source="gocd" AND (event="pipeline_created" OR http_request) AND dest_ip IN (internal_subnets)