CVE-2025-25791
📋 TL;DR
This vulnerability allows attackers to upload malicious Zip files through YZNCMS's plugin installation feature, potentially leading to arbitrary code execution. It affects YZNCMS v2.0.1 users who have the plugin installation functionality enabled. Attackers could gain control of affected systems.
💻 Affected Systems
- YZNCMS
📦 What is this software?
Yzncms by Yzncms
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full administrative control, data theft, and lateral movement capabilities.
Likely Case
Webshell deployment leading to website defacement, data exfiltration, or cryptocurrency mining.
If Mitigated
Limited impact if file uploads are restricted or monitored, though some exposure remains.
🎯 Exploit Status
Exploitation requires authentication to access plugin installation feature. Public proof-of-concept documentation exists.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None found
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available or implementing workarounds.
🔧 Temporary Workarounds
Disable Plugin Installation
allRemove or restrict access to the plugin installation functionality.
# Remove plugin installation directory or restrict permissions
# Example: chmod 000 /path/to/plugin/install/directory
Implement File Upload Restrictions
allConfigure web server to block Zip file uploads to plugin installation endpoints.
# Apache: Add to .htaccess
RewriteRule ^.*/plugin/install/.*\.zip$ - [F]
# Nginx: Add to server block
location ~* /plugin/install/.*\.zip$ { return 403; }
🧯 If You Can't Patch
- Implement strict network segmentation to isolate YZNCMS instances
- Deploy web application firewall with rules to block malicious file uploads
🔍 How to Verify
Check if Vulnerable:
Check if running YZNCMS v2.0.1 and plugin installation feature is accessible.Check Version:
# Check YZNCMS version in configuration files or admin panelVerify Fix Applied:
Test if Zip file uploads to plugin installation endpoints are blocked or properly validated.📡 Detection & Monitoring
Log Indicators:
- Unusual Zip file uploads to plugin installation paths
- Multiple failed upload attempts
- Suspicious POST requests to plugin endpoints
Network Indicators:
- HTTP POST requests with Zip files to /plugin/install/ paths
- Outbound connections from web server to unknown IPs
SIEM Query:
source="web_logs" AND (uri_path="/plugin/install/" AND file_extension="zip")