CVE-2022-42968 Overview
CVE-2022-42968 is a command injection vulnerability affecting Gitea versions prior to 1.17.3. The vulnerability exists due to insufficient sanitization and escaping of refs in the git backend, where arguments to git commands are mishandled. This flaw allows attackers to inject arbitrary arguments into git commands executed by the Gitea server, potentially leading to remote code execution.
Critical Impact
This vulnerability enables unauthenticated remote attackers to inject malicious arguments into git commands, potentially achieving full system compromise through remote code execution on affected Gitea instances.
Affected Products
- Gitea versions prior to 1.17.3
- Self-hosted Gitea instances with exposed git backend functionality
- Gitea deployments accepting untrusted repository operations
Discovery Timeline
- 2022-10-16 - CVE-2022-42968 published to NVD
- 2025-05-14 - Last updated in NVD database
Technical Details for CVE-2022-42968
Vulnerability Analysis
This vulnerability falls under CWE-88 (Improper Neutralization of Argument Delimiters in a Command), commonly known as argument injection. The root issue lies in how Gitea processes user-supplied refs (branch names, tag names, or commit references) before passing them to the underlying git command-line interface.
When a user interacts with repository operations that involve refs, Gitea constructs git commands by incorporating these user-provided values. Without proper sanitization, an attacker can craft malicious ref names containing special characters or argument delimiters that break out of the intended command context. This allows injection of additional arguments or entirely new commands to be executed by the git binary on the server.
The vulnerability is particularly dangerous because it can be exploited over the network without authentication, requires low attack complexity, and can result in complete compromise of confidentiality, integrity, and availability of the affected system.
Root Cause
The root cause stems from inadequate input validation in Gitea's git backend integration layer. Specifically, the application fails to properly escape or sanitize ref parameters before constructing shell commands. Git refs can contain a wide range of characters, and without strict validation, specially crafted ref names can be interpreted as command-line flags or arguments by the git binary, effectively bypassing the intended command structure.
Attack Vector
The attack vector is network-based, allowing remote exploitation. An attacker can craft malicious repository operations containing specially formatted ref names designed to inject additional arguments into git commands. This could include:
- Creating branches or tags with names containing argument injection payloads
- Manipulating fetch or push operations with crafted refspecs
- Exploiting repository browsing functionality that processes ref names
The vulnerability was addressed in the official GitHub Pull Request #21463 which implements proper sanitization and escaping of ref values before they are passed to git commands. The fix ensures that user-supplied refs are treated as data values rather than being interpreted as command arguments.
Detection Methods for CVE-2022-42968
Indicators of Compromise
- Unusual git process spawning with unexpected command-line arguments
- Repository operations containing refs with special characters like --, leading dashes, or shell metacharacters
- Unexpected system commands executed by the Gitea service user
- Anomalous network activity originating from the Gitea server
Detection Strategies
- Monitor Gitea logs for unusual ref names or malformed repository operation requests
- Implement process monitoring to detect git commands with suspicious argument patterns
- Deploy web application firewall rules to filter requests containing potential injection payloads in ref parameters
- Review audit logs for repository operations from untrusted or anonymous sources
Monitoring Recommendations
- Enable verbose logging for Gitea's git backend operations
- Configure alerts for git process executions with argument patterns matching known injection techniques
- Monitor for unexpected child processes spawned by the Gitea service
- Implement file integrity monitoring on the Gitea installation directory
How to Mitigate CVE-2022-42968
Immediate Actions Required
- Upgrade all Gitea instances to version 1.17.3 or later immediately
- Restrict network access to Gitea instances until patching is complete
- Review logs for any signs of exploitation attempts
- Consider temporarily disabling public repository access if immediate patching is not feasible
Patch Information
The vulnerability has been patched in Gitea version 1.17.3. Organizations should upgrade to this version or later as soon as possible. The fix implements proper sanitization and escaping of refs in the git backend to prevent argument injection.
For detailed patch information and release notes, refer to:
Workarounds
- Place Gitea behind a reverse proxy with strict input validation rules for ref parameters
- Disable anonymous access and require authentication for all repository operations
- Implement network segmentation to limit the impact of potential compromise
- Deploy application-level firewalls with rules to block requests containing suspicious ref patterns
# Example: Restrict Gitea access while patching
# Add to your firewall/iptables rules to limit access to trusted IPs only
iptables -A INPUT -p tcp --dport 3000 -s trusted_ip_range -j ACCEPT
iptables -A INPUT -p tcp --dport 3000 -j DROP
# Verify current Gitea version
gitea --version
# Upgrade Gitea to patched version (example for binary installation)
wget https://github.com/go-gitea/gitea/releases/download/v1.17.3/gitea-1.17.3-linux-amd64
chmod +x gitea-1.17.3-linux-amd64
systemctl stop gitea
mv gitea-1.17.3-linux-amd64 /usr/local/bin/gitea
systemctl start gitea
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
