CVE-2022-31267
📋 TL;DR
CVE-2022-31267 is a privilege escalation vulnerability in Gitblit 1.9.2 that allows attackers to gain administrative privileges by injecting control characters in profile data fields. This affects all Gitblit instances running the vulnerable version where user registration or profile editing is enabled. Attackers can exploit this to take full control of the Gitblit server.
💻 Affected Systems
- Gitblit
📦 What is this software?
Gitblit by Gitblit
⚠️ Risk & Real-World Impact
Worst Case
Complete compromise of the Gitblit server with administrative privileges, allowing attackers to access all repositories, modify configurations, execute arbitrary code, and potentially pivot to other systems.
Likely Case
Unauthorized administrative access leading to repository theft, code modification, and potential supply chain attacks through compromised Git repositories.
If Mitigated
Limited impact with proper network segmentation and monitoring, though privilege escalation would still be possible if the vulnerability is exploited.
🎯 Exploit Status
Exploitation requires user-level access to modify profile data. The vulnerability is well-documented in public issue trackers with technical details.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.9.3
Vendor Advisory: https://github.com/gitblit/gitblit/releases/tag/v1.9.3
Restart Required: Yes
Instructions:
1. Download Gitblit 1.9.3 from the official releases page. 2. Stop the Gitblit service. 3. Backup your current installation and configuration. 4. Replace the Gitblit JAR file with the patched version. 5. Restart the Gitblit service.
🔧 Temporary Workarounds
Disable User Registration
allPrevent new user registration to reduce attack surface
Edit gitblit.properties and set: realm.userService = com.gitblit.GitblitUserService
Set allowRegistration = false
Input Validation Filter
allImplement custom input validation to reject control characters in profile fields
Implement servlet filter or modify UserService to sanitize input before processing
🧯 If You Can't Patch
- Implement strict network access controls to limit Gitblit access to trusted users only
- Enable detailed logging and monitoring for privilege escalation attempts and unusual administrative actions
🔍 How to Verify
Check if Vulnerable:
Check the Gitblit version by accessing the web interface or examining the JAR file metadata. Version 1.9.2 is vulnerable.Check Version:
java -jar gitblit.jar --version or check the web interface footerVerify Fix Applied:
Verify the installation is running Gitblit 1.9.3 or later by checking the version in the web interface or JAR file.📡 Detection & Monitoring
Log Indicators:
- Unusual user profile modifications with control characters
- Sudden privilege changes for users
- Multiple failed login attempts followed by successful privilege escalation
Network Indicators:
- HTTP POST requests to user profile endpoints with encoded control characters
- Unusual administrative actions from non-admin users
SIEM Query:
source="gitblit" AND (message="*admin*" OR message="*privilege*" OR message="*role*")