CVE-2022-27313
📋 TL;DR
CVE-2022-27313 is an arbitrary file deletion vulnerability in Gitea that allows attackers to delete the configuration file, causing a Denial of Service. This affects Gitea v1.16.3 installations where attackers can exploit the vulnerability to disrupt service availability.
💻 Affected Systems
- Gitea
📦 What is this software?
Gitea by Gitea
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption requiring manual restoration of configuration files and potential data corruption if other critical files are deleted.
Likely Case
Temporary service outage until configuration file is restored from backup, causing downtime for users.
If Mitigated
Minimal impact with proper access controls, monitoring, and backup procedures in place.
🎯 Exploit Status
Exploitation requires some level of access to the Gitea instance, though specific authentication requirements are not detailed in available references.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v1.16.4 and later
Vendor Advisory: https://github.com/go-gitea/gitea/pull/19072
Restart Required: Yes
Instructions:
1. Backup your Gitea configuration and data. 2. Stop Gitea service. 3. Update to Gitea v1.16.4 or later. 4. Restart Gitea service. 5. Verify service is running correctly.
🔧 Temporary Workarounds
Restrict file permissions
linuxSet strict file permissions on configuration files to prevent deletion
chmod 600 /path/to/gitea/config/app.ini
chown gitea:gitea /path/to/gitea/config/app.ini
Network segmentation
allRestrict network access to Gitea instance to trusted sources only
🧯 If You Can't Patch
- Implement strict access controls and monitoring for configuration file access
- Maintain regular backups of configuration files and test restoration procedures
🔍 How to Verify
Check if Vulnerable:
Check Gitea version: if running v1.16.3, the system is vulnerable.Check Version:
gitea --versionVerify Fix Applied:
Verify Gitea version is v1.16.4 or later and test that configuration file cannot be deleted via the vulnerability.📡 Detection & Monitoring
Log Indicators:
- Unauthorized file deletion attempts in Gitea logs
- Configuration file modification or deletion events in system logs
Network Indicators:
- Unusual API calls to file deletion endpoints from unexpected sources
SIEM Query:
source="gitea.log" AND ("delete" OR "remove") AND "config"