CVE-2024-49366
📋 TL;DR
Nginx UI v2.0.0-beta.35 and earlier contains a path traversal vulnerability that allows attackers to write arbitrary files to the server by manipulating JSON input with '../../' sequences. This can lead to unauthorized file modifications, permission changes, or potential remote code execution. Users running affected versions of Nginx UI are vulnerable.
💻 Affected Systems
- Nginx UI
📦 What is this software?
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
Nginx Ui by Nginxui
⚠️ Risk & Real-World Impact
Worst Case
Complete server compromise through arbitrary file write leading to remote code execution, configuration modification, or privilege escalation.
Likely Case
Unauthorized file modification, configuration changes to Nginx, or permission manipulation on the server.
If Mitigated
Limited impact if proper input validation and file system permissions are in place, potentially only affecting non-critical files.
🎯 Exploit Status
The advisory suggests unauthenticated exploitation is possible through JSON field manipulation.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: v2.0.0-beta.36
Vendor Advisory: https://github.com/0xJacky/nginx-ui/security/advisories/GHSA-prv4-rx44-f7jr
Restart Required: Yes
Instructions:
1. Backup current configuration. 2. Stop Nginx UI service. 3. Update to v2.0.0-beta.36 or later from GitHub releases. 4. Restart Nginx UI service. 5. Verify functionality.
🔧 Temporary Workarounds
Input Validation Filter
allImplement middleware to filter '../' sequences in JSON input before processing.
# Requires custom code modification - implement input sanitization in request handlers
Restrict File System Permissions
linuxRun Nginx UI with minimal file system permissions and use chroot/jail where possible.
sudo chown -R nginx:nginx /var/www/nginx-ui
sudo chmod -R 750 /var/www/nginx-ui
🧯 If You Can't Patch
- Implement network segmentation to restrict access to Nginx UI interface
- Deploy web application firewall (WAF) with path traversal protection rules
🔍 How to Verify
Check if Vulnerable:
Check Nginx UI version via web interface or configuration files. Versions <= v2.0.0-beta.35 are vulnerable.Check Version:
Check package version or look for version information in web interface/configuration filesVerify Fix Applied:
Verify version is v2.0.0-beta.36 or later and test JSON input with '../' sequences is rejected.📡 Detection & Monitoring
Log Indicators:
- Unusual file write operations in system logs
- JSON requests containing '../' patterns in Nginx UI logs
- Permission denied errors for unexpected file paths
Network Indicators:
- HTTP POST requests to Nginx UI endpoints with JSON payloads
- Unusual file transfer patterns from Nginx UI server
SIEM Query:
source="nginx-ui" AND ("../" OR "..\\" OR path_traversal)