CVE-2022-1986
📋 TL;DR
CVE-2022-1986 is an OS command injection vulnerability in Gogs (a self-hosted Git service) that allows attackers to execute arbitrary commands on the server. This affects all Gogs installations prior to version 0.12.9. Attackers can potentially gain full control of the server if they can reach the vulnerable endpoint.
💻 Affected Systems
- Gogs (Go Git Service)
📦 What is this software?
Gogs by Gogs
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise leading to data theft, lateral movement, ransomware deployment, or persistent backdoor installation.
Likely Case
Unauthenticated remote code execution allowing attackers to execute arbitrary commands with the privileges of the Gogs process.
If Mitigated
Limited impact if proper network segmentation, least privilege, and input validation are in place.
🎯 Exploit Status
The vulnerability is in the git hook functionality where user-controlled input is passed to shell commands without proper sanitization.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.12.9 and later
Vendor Advisory: https://github.com/gogs/gogs/commit/38aff73251cc46ced96dd608dab6190415032a82
Restart Required: Yes
Instructions:
1. Backup your Gogs data and configuration. 2. Stop the Gogs service. 3. Update to version 0.12.9 or later using your package manager or by downloading from GitHub. 4. Restart the Gogs service. 5. Verify the update was successful.
🔧 Temporary Workarounds
Network Access Control
linuxRestrict network access to Gogs to only trusted IP addresses or networks.
# Example iptables rule to restrict access
iptables -A INPUT -p tcp --dport 3000 -s TRUSTED_IP -j ACCEPT
iptables -A INPUT -p tcp --dport 3000 -j DROP
Disable Git Hooks
allDisable or restrict git hook functionality if not required.
# Modify Gogs configuration to disable hooks
# In custom/conf/app.ini set:
[repository]
DISABLE_GIT_HOOKS = true
🧯 If You Can't Patch
- Implement strict network segmentation and firewall rules to limit access to Gogs
- Run Gogs with minimal privileges using a dedicated non-root user account
🔍 How to Verify
Check if Vulnerable:
Check if your Gogs version is below 0.12.9. The vulnerability exists in all versions prior to this.Check Version:
gogs --version or check the version in the Gogs web interface under Settings -> AboutVerify Fix Applied:
Verify that Gogs version is 0.12.9 or higher and that the patch commit 38aff73251cc46ced96dd608dab6190415032a82 is applied.📡 Detection & Monitoring
Log Indicators:
- Unusual git hook executions
- Suspicious command execution patterns in system logs
- Failed authentication attempts followed by successful exploitation
Network Indicators:
- Unusual outbound connections from Gogs server
- Suspicious payloads in HTTP requests to git hook endpoints
SIEM Query:
source="gogs.log" AND ("git hook" OR "exec" OR "command injection")