CVE-2024-42676
📋 TL;DR
This vulnerability allows remote attackers to upload arbitrary files to the Huizhi enterprise resource management system, potentially leading to remote code execution. Attackers can exploit the /nssys/common/Upload.Aspx?Action=DNPageAjaxPostBack component without authentication. Organizations using Huizhi ERP v1.0 or earlier are affected.
💻 Affected Systems
- Huizhi Enterprise Resource Management System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise with attacker gaining complete control over the server, data exfiltration, ransomware deployment, and lateral movement within the network.
Likely Case
Webshell deployment leading to persistent backdoor access, data theft, and potential privilege escalation within the ERP system.
If Mitigated
File upload attempts are blocked or quarantined, preventing malicious file execution while maintaining system functionality.
🎯 Exploit Status
Public GitHub repositories contain exploit details and proof-of-concept code
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available from vendor, or implement workarounds.
🔧 Temporary Workarounds
Block Vulnerable Endpoint
allConfigure web server or WAF to block access to /nssys/common/Upload.Aspx?Action=DNPageAjaxPostBack
IIS: Use URL Rewrite module to block pattern ^/nssys/common/Upload\.Aspx\?Action=DNPageAjaxPostBack$
Apache: RewriteRule ^/nssys/common/Upload\.Aspx\?Action=DNPageAjaxPostBack$ - [F]
Implement File Upload Restrictions
windowsConfigure server-side validation for file uploads including file type, size, and content validation
ASP.NET: Implement HttpPostedFile validation in code-behind
IIS: Configure Request Filtering to block dangerous extensions
🧯 If You Can't Patch
- Isolate the ERP system in a separate network segment with strict firewall rules
- Implement web application firewall (WAF) with file upload protection rules
🔍 How to Verify
Check if Vulnerable:
Attempt to access https://[target]/nssys/common/Upload.Aspx?Action=DNPageAjaxPostBack and test file upload functionalityCheck Version:
Check application version in web interface or configuration filesVerify Fix Applied:
Test that file uploads to the vulnerable endpoint are blocked and verify WAF/rewrite rules are active📡 Detection & Monitoring
Log Indicators:
- HTTP POST requests to /nssys/common/Upload.Aspx with Action=DNPageAjaxPostBack
- File upload attempts with suspicious extensions (.aspx, .ashx, .jsp, .php)
- Unusual file creation in upload directories
Network Indicators:
- POST requests to vulnerable endpoint from unexpected sources
- Large file uploads to the upload component
SIEM Query:
source="web_server" AND (url="/nssys/common/Upload.Aspx" AND params.Action="DNPageAjaxPostBack")