CVE-2025-1555
📋 TL;DR
This critical vulnerability in hzmanyun Education and Training System 3.1.1 allows remote attackers to upload arbitrary files without restrictions via the saveImage function. This affects all systems running the vulnerable version of this education software, potentially enabling complete system compromise.
💻 Affected Systems
- hzmanyun Education and Training System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Remote code execution leading to full system takeover, data theft, ransomware deployment, or use as a foothold for lateral movement within the network.
Likely Case
Webshell upload enabling persistent backdoor access, file system manipulation, and potential privilege escalation.
If Mitigated
Limited impact if file uploads are restricted to authenticated users only and proper file validation is implemented.
🎯 Exploit Status
Exploit has been publicly disclosed and requires minimal technical skill to execute. The vendor has not responded to disclosure attempts.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown - vendor unresponsive
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Consider workarounds or migrating to alternative software if vendor remains unresponsive.
🔧 Temporary Workarounds
Restrict file upload functionality
allDisable or block access to the saveImage function via web application firewall or server configuration
# Example Apache mod_rewrite rule to block saveImage
RewriteEngine On
RewriteRule ^.*saveImage.*$ - [F,L]
Implement strict file upload validation
allAdd server-side validation to restrict file types, names, and sizes for all upload functionality
# Implement in application code:
# - Validate file extensions against whitelist
# - Check MIME types
# - Rename uploaded files
# - Store outside web root
🧯 If You Can't Patch
- Isolate the vulnerable system in a restricted network segment with no internet access
- Implement strict network monitoring and file integrity monitoring on the affected server
🔍 How to Verify
Check if Vulnerable:
Check if system is running hzmanyun Education and Training System version 3.1.1 and has the saveImage function accessibleCheck Version:
Check application configuration files or admin interface for version informationVerify Fix Applied:
Test if arbitrary file uploads are still possible via the saveImage endpoint📡 Detection & Monitoring
Log Indicators:
- Unusual file upload activity to saveImage endpoint
- Uploads of non-image file types
- Large or suspicious file uploads
Network Indicators:
- POST requests to saveImage endpoint with unusual file extensions
- Traffic patterns indicating file upload exploitation
SIEM Query:
source="web_server" AND (uri="*saveImage*" OR method="POST") AND (file_extension!="jpg" AND file_extension!="png" AND file_extension!="gif")