CVE-2024-54148
📋 TL;DR
This vulnerability in Gogs allows a malicious user to commit a crafted symlink file to a repository, potentially gaining SSH access to the server. All Gogs instances running vulnerable versions are affected, particularly those with user repositories enabled. Attackers could achieve remote code execution on the Gogs server.
💻 Affected Systems
- Gogs
📦 What is this software?
Gogs by Gogs
⚠️ Risk & Real-World Impact
Worst Case
Full server compromise with SSH access, allowing attackers to execute arbitrary commands, steal data, install malware, or pivot to other systems.
Likely Case
Unauthorized SSH access leading to repository manipulation, data theft, and potential lateral movement within the network.
If Mitigated
Limited impact if proper access controls, network segmentation, and monitoring are in place, though the vulnerability still presents significant risk.
🎯 Exploit Status
Exploitation requires authenticated user access to commit to a repository. The vulnerability is straightforward to exploit once access is obtained.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.13.1
Vendor Advisory: https://github.com/gogs/gogs/security/advisories/GHSA-r7j8-5h9c-f6fx
Restart Required: Yes
Instructions:
1. Backup your Gogs data and configuration. 2. Stop the Gogs service. 3. Update to version 0.13.1 or later. 4. Restart the Gogs service. 5. Verify the update was successful.
🔧 Temporary Workarounds
Disable repository creation
allTemporarily disable user repository creation to prevent exploitation
Edit app.ini and set ENABLE_USER_REPOSITORIES = false
Restrict SSH access
linuxLimit SSH access to Gogs server using firewall rules
iptables -A INPUT -p tcp --dport 22 -s trusted_ip -j ACCEPT
iptables -A INPUT -p tcp --dport 22 -j DROP
🧯 If You Can't Patch
- Implement strict access controls and monitor repository activity for suspicious symlink creation
- Isolate Gogs server from critical systems and implement network segmentation
🔍 How to Verify
Check if Vulnerable:
Check Gogs version in admin panel or via command line. If version is below 0.13.1, the system is vulnerable.Check Version:
./gogs --version or check admin dashboardVerify Fix Applied:
After updating, verify version is 0.13.1 or higher and test that symlink files cannot be used to gain SSH access.📡 Detection & Monitoring
Log Indicators:
- Unusual symlink file commits in repository logs
- Failed SSH authentication attempts from unexpected sources
- Repository activity from suspicious users
Network Indicators:
- Unexpected SSH connections to Gogs server
- Network traffic patterns indicating data exfiltration
SIEM Query:
source="gogs" AND (symlink OR "symbolic link") AND commit