CVE-2021-3382
📋 TL;DR
A stack buffer overflow vulnerability in Gitea versions 1.9.0 through 1.13.1 allows remote attackers to crash the service via specially crafted file paths. This affects all Gitea instances running vulnerable versions, potentially causing denial of service. The vulnerability is exploitable remotely without authentication.
💻 Affected Systems
- Gitea
📦 What is this software?
Gitea by Gitea
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to complete system compromise, though this specific CVE only documents denial of service.
Likely Case
Service crash and denial of service, requiring manual restart of Gitea.
If Mitigated
Minimal impact with proper network segmentation and updated versions.
🎯 Exploit Status
Vectors involve file path manipulation; exploitation appears straightforward based on CWE-787 classification.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.13.2 and later
Vendor Advisory: https://github.com/go-gitea/gitea/pull/14390
Restart Required: Yes
Instructions:
1. Backup your Gitea data and configuration. 2. Stop Gitea service. 3. Update to Gitea 1.13.2 or later using your package manager or manual installation. 4. Restart Gitea service. 5. Verify the update was successful.
🔧 Temporary Workarounds
Network Access Restriction
linuxRestrict network access to Gitea to trusted IP addresses only
iptables -A INPUT -p tcp --dport 3000 -s trusted_ip_range -j ACCEPT
iptables -A INPUT -p tcp --dport 3000 -j DROP
🧯 If You Can't Patch
- Implement strict network segmentation to isolate Gitea from untrusted networks
- Deploy web application firewall (WAF) with buffer overflow protection rules
🔍 How to Verify
Check if Vulnerable:
Check Gitea version via web interface or command line: gitea --versionCheck Version:
gitea --versionVerify Fix Applied:
Confirm version is 1.13.2 or higher and test file upload functionality📡 Detection & Monitoring
Log Indicators:
- Gitea service crash logs
- Unexpected file path requests in access logs
- Stack trace errors in application logs
Network Indicators:
- Multiple connection attempts with malformed file paths
- Unusual traffic patterns to file upload endpoints
SIEM Query:
source="gitea.log" AND ("panic" OR "stack overflow" OR "segmentation fault")