CVE-2024-39930
📋 TL;DR
This vulnerability allows authenticated attackers to execute arbitrary code on Gogs servers by exploiting argument injection in the built-in SSH server. It affects Gogs installations with the built-in SSH server enabled, specifically versions through 0.13.0. Windows installations are not vulnerable.
💻 Affected Systems
- Gogs
📦 What is this software?
Gogs by Gogs
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining root/administrator privileges, allowing data theft, lateral movement, and persistent backdoor installation.
Likely Case
Unauthorized code execution leading to repository manipulation, credential theft, and potential access to connected systems.
If Mitigated
Limited impact if SSH server is disabled or proper network segmentation prevents access to vulnerable service.
🎯 Exploit Status
Exploitation requires authenticated SSH access. Technical details and proof-of-concept are publicly available.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 0.14.0 and later
Vendor Advisory: https://github.com/gogs/gogs/releases
Restart Required: Yes
Instructions:
1. Backup your Gogs data and configuration. 2. Download Gogs 0.14.0 or later from official releases. 3. Stop the Gogs service. 4. Replace the binary with the patched version. 5. Restart the Gogs service. 6. Verify the version is 0.14.0 or higher.
🔧 Temporary Workarounds
Disable built-in SSH server
linuxDisable the vulnerable SSH server component and use external SSH solutions
Edit app.ini configuration file and set DISABLE_SSH = true
Restart Gogs service
Network access control
allRestrict SSH access to trusted IP addresses only
Configure firewall rules to limit SSH port access
Use network segmentation to isolate Gogs server
🧯 If You Can't Patch
- Disable built-in SSH server immediately and use external SSH solutions
- Implement strict network segmentation and firewall rules to limit SSH access to trusted sources only
🔍 How to Verify
Check if Vulnerable:
Check if Gogs version is 0.13.0 or earlier AND built-in SSH server is enabled in configurationCheck Version:
./gogs --version or check web interface admin panelVerify Fix Applied:
Verify Gogs version is 0.14.0 or later using version check command📡 Detection & Monitoring
Log Indicators:
- Unusual SSH connection patterns
- Malformed SSH requests with --split-string env parameters
- Unexpected process execution from Gogs SSH service
Network Indicators:
- SSH connections to Gogs server followed by unusual outbound connections
- Traffic patterns indicating command execution
SIEM Query:
source="gogs" AND ("--split-string" OR "env request" OR "SSH argument injection")🔗 References
- https://github.com/gogs/gogs/releases
- https://www.sonarsource.com/blog/securing-developer-tools-unpatched-code-vulnerabilities-in-gogs-1/
- https://www.vicarius.io/vsociety/posts/argument-injection-in-gogs-ssh-server-cve-2024-39930
- https://github.com/gogs/gogs/releases
- https://www.sonarsource.com/blog/securing-developer-tools-unpatched-code-vulnerabilities-in-gogs-1/
- https://www.vicarius.io/vsociety/posts/argument-injection-in-gogs-ssh-server-cve-2024-39930
