CVE-2022-28120
📋 TL;DR
This vulnerability allows attackers to upload malicious files to the Open Virtual Simulation Experiment Teaching Management Platform software version 2.0. Exploitation can lead to remote code execution and complete server compromise. Organizations using this specific Chinese educational software are affected.
💻 Affected Systems
- Beijing Runnier Network Technology Co., Ltd Open Virtual Simulation Experiment Teaching Management Platform
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete server takeover with administrative privileges, data theft, lateral movement to other systems, and persistent backdoor installation.
Likely Case
Webshell deployment leading to data exfiltration, credential harvesting, and use as attack launch point.
If Mitigated
Limited impact with proper file upload restrictions, but still potential for information disclosure.
🎯 Exploit Status
File upload vulnerabilities are commonly exploited with simple tools. No public exploit code found but trivial to weaponize.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: https://www.cnvd.org.cn/flaw/show/CNVD-2021-39055
Restart Required: No
Instructions:
1. Contact vendor Beijing Runnier Network Technology for patch information. 2. Monitor CNVD for updates. 3. Consider alternative software if no patch available.
🔧 Temporary Workarounds
File Upload Restriction
allImplement strict file upload validation including file type checking, size limits, and content inspection.
Web Application Firewall Rules
allDeploy WAF rules to block suspicious file upload patterns and executable file types.
🧯 If You Can't Patch
- Isolate the vulnerable system in a DMZ with strict network segmentation
- Implement application-level file upload validation and store uploaded files outside web root
🔍 How to Verify
Check if Vulnerable:
Test file upload functionality with various file types including executable extensions. Check if server executes uploaded files.Check Version:
Check software version in admin panel or configuration files. Exact command unknown for this proprietary software.Verify Fix Applied:
Attempt to upload malicious files and verify they are rejected or stored safely without execution capability.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads with executable extensions
- Multiple failed upload attempts
- Webshell access patterns in web logs
Network Indicators:
- HTTP POST requests with file uploads to unusual paths
- Outbound connections from web server to unknown IPs
SIEM Query:
web.url:*upload* AND (web.file_extension:php OR web.file_extension:jsp OR web.file_extension:asp OR web.file_extension:exe)