CVE-2025-25361
📋 TL;DR
This vulnerability allows attackers to upload malicious SVG or XML files to PublicCMS v4.0.202406, potentially leading to remote code execution. Attackers can exploit the /cms/CmsWebFileAdminController.java component to upload arbitrary files, which could compromise the entire system. Organizations using PublicCMS v4.0.202406 are affected.
💻 Affected Systems
- PublicCMS
📦 What is this software?
Publiccms by Publiccms
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise with attacker gaining full control over the server, data exfiltration, and lateral movement to other systems.
Likely Case
Webshell deployment leading to data theft, defacement, or use as a pivot point for further attacks.
If Mitigated
File upload blocked or sanitized, preventing malicious file execution while maintaining normal functionality.
🎯 Exploit Status
Exploitation requires file upload access to the vulnerable endpoint; authentication requirements depend on configuration.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Unknown
Restart Required: No
Instructions:
Check for vendor updates; if unavailable, apply workarounds or upgrade to a newer version if patched.
🔧 Temporary Workarounds
Restrict File Upload Types
allConfigure web server or application to block SVG and XML file uploads to the vulnerable endpoint.
# Example for Apache: Add to .htaccess
<FilesMatch "\.(svg|xml)$">
Order Allow,Deny
Deny from all
</FilesMatch>
# Example for Nginx: Add to server block
location ~* \.(svg|xml)$ {
deny all;
}
Disable Vulnerable Component
linuxRemove or restrict access to /cms/CmsWebFileAdminController.java if not required.
# Rename or move the vulnerable file
mv /path/to/CmsWebFileAdminController.java /path/to/CmsWebFileAdminController.java.disabled
# Or set restrictive permissions
chmod 000 /path/to/CmsWebFileAdminController.java
🧯 If You Can't Patch
- Implement strict input validation and sanitization for file uploads, rejecting SVG and XML files.
- Deploy a Web Application Firewall (WAF) with rules to block malicious file uploads and monitor for exploitation attempts.
🔍 How to Verify
Check if Vulnerable:
Check if PublicCMS version is v4.0.202406 and the /cms/CmsWebFileAdminController.java endpoint is accessible for file uploads.Check Version:
Check application configuration files or admin panel for version information; no standard command available.Verify Fix Applied:
Test file upload functionality with SVG/XML files; successful upload should be blocked or sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads to /cms/CmsWebFileAdminController.java, especially SVG or XML files.
- Increased error logs related to file processing or execution attempts.
Network Indicators:
- HTTP POST requests to the vulnerable endpoint with file uploads.
- Unusual outbound connections from the server post-upload.
SIEM Query:
Example: source="web_logs" AND (uri="/cms/CmsWebFileAdminController.java" AND method="POST" AND (file_extension="svg" OR file_extension="xml"))