CVE-2025-65897
📋 TL;DR
This vulnerability in zdh_web allows authenticated users to upload arbitrary files to any location on the server due to insufficient path validation. Attackers can overwrite critical system files, potentially leading to privilege escalation or remote code execution. All users running zdh_web versions through 5.6.17 are affected.
💻 Affected Systems
- zdh_web
📦 What is this software?
Zdh Web by Zhaoyachao
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise via remote code execution, data theft, and complete control of the zdh_web platform and underlying server.
Likely Case
Privilege escalation within zdh_web, unauthorized data access, and potential lateral movement to other systems.
If Mitigated
Limited impact with proper file system permissions and network segmentation, potentially only affecting zdh_web application files.
🎯 Exploit Status
Exploitation requires authenticated access but is technically simple once credentials are obtained. The vulnerability is well-documented in GitHub issues.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 5.6.18 or later
Vendor Advisory: https://github.com/zhaoyachao/zdh_web/commit/b2423378a8bf83f159f19ce4e14eac71c939793a
Restart Required: Yes
Instructions:
1. Backup current configuration and data. 2. Update zdh_web to version 5.6.18 or later from the official GitHub repository. 3. Restart the zdh_web service. 4. Verify the fix by testing file upload functionality.
🔧 Temporary Workarounds
Disable file upload functionality
allTemporarily disable file upload features in zdh_web configuration
Edit zdh_web configuration to remove or disable upload endpoints
Restrict file system permissions
linuxSet strict file system permissions to limit where zdh_web can write files
chmod 750 /path/to/zdh_web/uploads
chown root:zdh_web /path/to/zdh_web/uploads
🧯 If You Can't Patch
- Implement strict network segmentation to isolate zdh_web from critical systems
- Enforce least privilege access controls and monitor all authenticated user activity
🔍 How to Verify
Check if Vulnerable:
Check zdh_web version in web interface or configuration files. Versions 5.6.17 and earlier are vulnerable.Check Version:
Check web interface or grep for version in configuration filesVerify Fix Applied:
Test file upload functionality with malicious path traversal attempts. Successful uploads should be restricted to designated directories.📡 Detection & Monitoring
Log Indicators:
- Unusual file upload patterns
- Path traversal attempts in upload requests
- Unauthorized file writes outside upload directories
Network Indicators:
- HTTP POST requests to upload endpoints with suspicious path parameters
SIEM Query:
source="zdh_web" AND (http_method="POST" AND uri_path="*upload*" AND (request_contains="../" OR request_contains="..\"))