CVE-2020-10507
📋 TL;DR
This vulnerability allows attackers to upload malicious files to the School Manage System, potentially leading to remote code execution on the hosting server. It affects School Manage System versions before 2020 developed by ALLE INFORMATION CO., LTD. Organizations using this software are at risk of complete system compromise.
💻 Affected Systems
- School Manage System
📦 What is this software?
The School Manage System by The School Manage System Project
⚠️ Risk & Real-World Impact
Worst Case
Complete system takeover with attacker gaining full control of the hosting server, data exfiltration, lateral movement, and persistent backdoor installation.
Likely Case
Attackers upload web shells to execute arbitrary commands, steal sensitive student/administrative data, and potentially pivot to other systems.
If Mitigated
With proper file upload restrictions and web application firewalls, impact is limited to denial of service or file storage exhaustion.
🎯 Exploit Status
Unrestricted file upload vulnerabilities are commonly exploited with simple tools and scripts.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 2020 version or later
Vendor Advisory: https://www.chtsecurity.com/news/be93c576-e421-489f-9453-a462bdd4c90d
Restart Required: Yes
Instructions:
1. Contact ALLE INFORMATION CO., LTD. for updated version. 2. Backup current system and data. 3. Install the 2020 or later version. 4. Restart the application server. 5. Verify functionality.
🔧 Temporary Workarounds
Web Application Firewall Rules
allImplement WAF rules to block malicious file uploads and suspicious file extensions.
File Upload Restrictions
allConfigure server to only allow specific file types and implement file content validation.
🧯 If You Can't Patch
- Isolate the School Manage System in a separate network segment with strict firewall rules
- Implement application-level file upload validation and scanning for all uploads
🔍 How to Verify
Check if Vulnerable:
Check system version in administration panel or contact vendor. If version is pre-2020, assume vulnerable.Check Version:
Check administration panel or contact vendor directly as no standard command exists.Verify Fix Applied:
Verify system version is 2020 or later and test file upload functionality with restricted file types.📡 Detection & Monitoring
Log Indicators:
- Unusual file uploads with executable extensions
- Multiple failed upload attempts
- Web shell access patterns in access logs
Network Indicators:
- HTTP POST requests with unusual file extensions
- Outbound connections from web server to unknown IPs
SIEM Query:
source="web_logs" AND (uri="*.php" OR uri="*.jsp" OR uri="*.asp") AND method="POST" AND size>100000