CVE-2024-0648
📋 TL;DR
This critical vulnerability in Yunyou CMS allows remote attackers to upload arbitrary files without restrictions by manipulating the templateFile parameter in Common.php. This affects all Yunyou CMS installations up to version 2.2.6, potentially enabling complete system compromise.
💻 Affected Systems
- Yunyou CMS
📦 What is this software?
Yunyou Cms by Yunyou Cms Project
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full system takeover, data exfiltration, and persistent backdoor installation.
Likely Case
Webshell upload enabling unauthorized access, data manipulation, and lateral movement within the network.
If Mitigated
File upload attempts blocked at WAF or detected by file integrity monitoring.
🎯 Exploit Status
Public exploit details available in disclosed references, making exploitation straightforward.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None found in provided references
Restart Required: No
Instructions:
No official patch available. Consider upgrading to latest version if available or implementing workarounds.
🔧 Temporary Workarounds
File Upload Restriction
allImplement strict file upload validation in Common.php to restrict allowed file types and extensions.
Modify /app/index/controller/Common.php to validate templateFile parameter against whitelist
WAF Rule Implementation
allDeploy web application firewall rules to block requests containing suspicious file upload patterns.
Add WAF rule: Block requests to Common.php with templateFile parameter containing executable extensions
🧯 If You Can't Patch
- Isolate affected systems from internet access
- Implement strict network segmentation and monitor for suspicious file upload activity
🔍 How to Verify
Check if Vulnerable:
Check Yunyou CMS version in admin panel or configuration files. If version ≤ 2.2.6, system is vulnerable.Check Version:
Check /config/version.php or admin dashboard for version informationVerify Fix Applied:
Test file upload functionality with malicious payloads to confirm restrictions are working.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to Common.php
- Requests with templateFile parameter containing executable extensions
- Multiple failed upload attempts
Network Indicators:
- HTTP POST requests to /app/index/controller/Common.php with file upload patterns
- Outbound connections from web server to unknown IPs
SIEM Query:
source="web_logs" AND uri="/app/index/controller/Common.php" AND (method="POST" OR params CONTAINS "templateFile")