CVE-2025-1676
📋 TL;DR
This critical vulnerability in hzmanyun Education and Training System allows remote attackers to execute arbitrary operating system commands via command injection in the pdf2swf function. Attackers can exploit this to take full control of affected systems. Organizations using hzmanyun Education and Training System version 3.1.1 are affected.
💻 Affected Systems
- hzmanyun Education and Training System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete system compromise allowing attackers to install malware, steal sensitive data, pivot to other systems, and maintain persistent access.
Likely Case
Remote code execution leading to data theft, system disruption, or ransomware deployment.
If Mitigated
Limited impact if proper network segmentation, least privilege, and monitoring are in place, though exploitation risk remains.
🎯 Exploit Status
Public exploit code is available, making exploitation trivial for attackers. No authentication is required to trigger the vulnerability.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None found in provided references
Restart Required: No
Instructions:
No official patch information available. Monitor vendor channels for updates and apply immediately when released.
🔧 Temporary Workarounds
Disable pdf2swf endpoint
allBlock or disable access to the vulnerable /pdf2swf endpoint
# Web server configuration to block /pdf2swf
# Example for Apache: RewriteRule ^/pdf2swf - [F,L]
# Example for Nginx: location /pdf2swf { deny all; }
Network access control
linuxRestrict network access to the application using firewall rules
# Example iptables rule to restrict access
iptables -A INPUT -p tcp --dport [APPLICATION_PORT] -s [TRUSTED_NETWORK] -j ACCEPT
iptables -A INPUT -p tcp --dport [APPLICATION_PORT] -j DROP
🧯 If You Can't Patch
- Isolate affected systems in a segmented network zone with strict egress filtering
- Implement web application firewall (WAF) rules to block command injection patterns targeting the pdf2swf parameter
🔍 How to Verify
Check if Vulnerable:
Check if hzmanyun Education and Training System version 3.1.1 is installed and if the /pdf2swf endpoint is accessible. Test with controlled command injection payloads in a safe environment.Check Version:
# Check application version through admin interface or configuration files
# Exact command depends on installation method and locationVerify Fix Applied:
Verify that the /pdf2swf endpoint is no longer accessible or that command injection attempts are blocked. Test with the same payloads used for verification.📡 Detection & Monitoring
Log Indicators:
- Unusual commands in web server logs containing shell metacharacters (;, |, &, $, etc.)
- Multiple requests to /pdf2swf with unusual file parameter values
- System process creation from web server user account
Network Indicators:
- Outbound connections from web server to unexpected destinations
- Unusual traffic patterns to/from the application server
SIEM Query:
source="web_server" AND (url="/pdf2swf" OR (url CONTAINS "pdf2swf" AND (param CONTAINS ";" OR param CONTAINS "|" OR param CONTAINS "$" OR param CONTAINS "`")))