CVE-2024-56731
📋 TL;DR
This vulnerability allows unprivileged users in Gogs to delete files in the .git directory, leading to remote command execution. Attackers can execute arbitrary commands with the privileges of the RUN_USER account, potentially compromising all code hosted on the instance. All Gogs instances prior to version 0.13.3 are affected.
💻 Affected Systems
- Gogs
📦 What is this software?
Gogs by Gogs
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the Gogs server, allowing attackers to execute arbitrary commands, access and modify all hosted repositories, steal credentials, and pivot to other systems.
Likely Case
Unauthorized access to repositories, code theft, and potential lateral movement within the network.
If Mitigated
Limited impact if proper network segmentation and least privilege principles are applied, though the vulnerability still allows repository access.
🎯 Exploit Status
Exploitation requires an unprivileged user account. The vulnerability is a follow-up to CVE-2024-39931 with an insufficient patch.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.13.3
Vendor Advisory: https://github.com/gogs/gogs/security/advisories/GHSA-wj44-9vcg-wjq7
Restart Required: Yes
Instructions:
1. Backup your Gogs data and configuration. 2. Download Gogs 0.13.3 from the official releases. 3. Stop the Gogs service. 4. Replace the existing Gogs binary with the new version. 5. Restart the Gogs service. 6. Verify the version is updated.
🔧 Temporary Workarounds
Disable user registration
allPrevent new unprivileged user accounts from being created to reduce attack surface.
Edit app.ini and set DISABLE_REGISTRATION = true under [service] section
Network isolation
allRestrict Gogs access to trusted networks only.
Configure firewall rules to limit access to Gogs port (typically 3000)
🧯 If You Can't Patch
- Implement strict network access controls to limit Gogs exposure
- Monitor for suspicious activity and implement enhanced logging
🔍 How to Verify
Check if Vulnerable:
Check Gogs version via web interface or by running the Gogs binary with --version flag.Check Version:
./gogs --versionVerify Fix Applied:
Confirm version is 0.13.3 or later and test that unprivileged users cannot delete .git directory files.📡 Detection & Monitoring
Log Indicators:
- Unusual file deletion patterns in .git directories
- Unexpected command execution logs
- Failed authentication attempts followed by successful operations
Network Indicators:
- Unusual outbound connections from Gogs server
- Unexpected SSH or command execution traffic
SIEM Query:
source="gogs.log" AND ("delete" OR "rm" OR "exec") AND ".git"