CVE-2022-30781 Overview
CVE-2022-30781 is a command injection vulnerability in Gitea, a self-hosted Git service, affecting versions prior to 1.16.7. The vulnerability exists because Gitea does not properly escape the git fetch remote parameter, allowing attackers to inject arbitrary commands through a network-accessible attack vector. This improper encoding issue (CWE-116) can lead to remote code execution on affected Gitea installations.
Critical Impact
Unauthenticated attackers can exploit this vulnerability over the network to execute arbitrary commands on vulnerable Gitea servers, potentially leading to complete system compromise.
Affected Products
- Gitea versions prior to 1.16.7
- Self-hosted Gitea installations with external repository mirroring enabled
- Gitea deployments accessible over the network
Discovery Timeline
- 2022-05-16 - CVE-2022-30781 published to NVD
- 2024-11-21 - Last updated in NVD database
Technical Details for CVE-2022-30781
Vulnerability Analysis
This vulnerability stems from improper output encoding or escaping (CWE-116) in Gitea's handling of git fetch remote operations. When Gitea processes repository mirroring or remote fetch operations, it fails to properly sanitize user-controlled input before passing it to the underlying git command-line interface. This creates an opportunity for attackers to inject malicious commands that will be executed with the privileges of the Gitea process.
The vulnerability is particularly dangerous because it can be exploited remotely without authentication, allowing an attacker to gain initial access to systems hosting Gitea instances. Successful exploitation can result in complete compromise of the Gitea server, including access to all hosted repositories, credentials, and potential lateral movement within the network.
Root Cause
The root cause of CVE-2022-30781 is the failure to properly escape or sanitize the remote URL parameter in git fetch operations. When constructing shell commands to execute git operations, Gitea directly incorporates user-supplied remote URLs without adequate validation or escaping. This allows specially crafted repository URLs containing shell metacharacters to break out of the intended command context and execute arbitrary commands.
The fix implemented in GitHub Pull Request #19487 and GitHub Pull Request #19490 addresses this by properly escaping remote URL parameters before they are passed to the shell.
Attack Vector
The attack vector for this vulnerability is network-based and requires no user interaction or privileges. An attacker can exploit this vulnerability by:
- Creating or modifying a repository with a maliciously crafted remote URL containing command injection payloads
- Triggering a git fetch operation on the vulnerable Gitea instance through mirror sync or similar functionality
- The injected commands execute with the privileges of the Gitea service account
The vulnerability has been documented in public exploit databases, with remote code execution exploits available on Packet Storm Security. This increases the risk of active exploitation in the wild.
Detection Methods for CVE-2022-30781
Indicators of Compromise
- Unusual git processes spawning with unexpected command arguments or shell metacharacters
- Suspicious outbound network connections originating from the Gitea service account
- Unexpected child processes spawned by the Gitea process (e.g., reverse shells, download utilities)
- Repository configurations containing special characters in remote URLs such as $, ;, |, or backticks
Detection Strategies
- Monitor Gitea process execution for anomalous child process creation using endpoint detection and response (EDR) solutions
- Implement network monitoring to detect connections to known malicious infrastructure from Gitea servers
- Review Gitea audit logs for repository creation or modification with unusual remote URL patterns
- Deploy SentinelOne agents on Gitea servers to detect command injection attempts and unauthorized code execution
Monitoring Recommendations
- Enable verbose logging for git operations in Gitea to capture remote URL parameters
- Configure alerting for any shell command execution by the Gitea service that includes unexpected characters
- Monitor file system changes in Gitea installation directories for signs of post-exploitation activity
- Implement network segmentation to limit the blast radius of a potential compromise
How to Mitigate CVE-2022-30781
Immediate Actions Required
- Upgrade Gitea to version 1.16.7 or later immediately
- If immediate upgrade is not possible, disable repository mirroring and external remote functionality
- Review existing repository configurations for suspicious remote URLs
- Audit Gitea servers for signs of compromise if they were exposed while running vulnerable versions
Patch Information
Gitea has released version 1.16.7 which addresses this vulnerability. The fix properly escapes remote URL parameters to prevent command injection. Administrators should upgrade to version 1.16.7 or later as documented in the Gitea Release Announcement.
The security patches are available in the following pull requests:
Workarounds
- Disable repository mirroring functionality until the patch can be applied
- Implement network-level access controls to restrict who can create or modify repositories
- Place Gitea behind a web application firewall (WAF) with rules to detect command injection patterns
- Run Gitea in a containerized environment with restricted capabilities to limit the impact of exploitation
# Configuration example - Disable mirroring in app.ini
[repository]
DISABLE_MIRRORS = true
# Restrict repository creation to administrators only
[repository]
DEFAULT_REPO_UNITS = repo.code
ONLY_ALLOW_PUSH_IF_GITEA_ENVIRONMENT_SET = true
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
