CVE-2020-27408
📋 TL;DR
CVE-2020-27408 allows unauthenticated attackers to reset passwords for any user in OpenSIS Community Edition. This affects all OpenSIS Community Edition installations up to version 7.6. Attackers can gain unauthorized access to administrative or user accounts.
💻 Affected Systems
- OpenSIS Community Edition
📦 What is this software?
Opensis by Os4ed
⚠️ Risk & Real-World Impact
Worst Case
Attackers gain administrative access, modify student records, change grades, access sensitive personal information, or disrupt school operations.
Likely Case
Attackers reset passwords for high-privilege accounts to access sensitive student data or modify academic records.
If Mitigated
With proper access controls and authentication requirements, the vulnerability would be prevented, maintaining normal system functionality.
🎯 Exploit Status
The vulnerability requires no authentication and has simple exploitation via HTTP requests to ResetUserInfo.php with target user parameters.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 7.7 and later
Vendor Advisory: https://github.com/OS4ED/openSIS-Responsive-Design/releases
Restart Required: No
Instructions:
1. Backup your OpenSIS installation and database. 2. Download OpenSIS version 7.7 or later from the official repository. 3. Replace the vulnerable ResetUserInfo.php file with the patched version. 4. Verify the fix by testing password reset functionality.
🔧 Temporary Workarounds
Restrict access to ResetUserInfo.php
allBlock unauthenticated access to the vulnerable file using web server configuration or firewall rules.
# Apache: Add to .htaccess
<Files "ResetUserInfo.php">
Require valid-user
</Files>
# Nginx: Add to server block
location ~ /ResetUserInfo\.php$ {
deny all;
}
Remove or rename vulnerable file
linuxTemporarily disable the password reset functionality by removing or renaming the vulnerable file.
mv /path/to/opensis/ResetUserInfo.php /path/to/opensis/ResetUserInfo.php.disabled
🧯 If You Can't Patch
- Implement network segmentation to isolate OpenSIS from untrusted networks.
- Enable multi-factor authentication for all administrative accounts to reduce impact of password resets.
🔍 How to Verify
Check if Vulnerable:
Attempt to access ResetUserInfo.php without authentication. If it allows password reset without login, the system is vulnerable.Check Version:
Check the OpenSIS version in the admin panel or review the software documentation/configuration files.Verify Fix Applied:
After patching, attempt the same unauthenticated access to ResetUserInfo.php. It should require authentication or return an error.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authentication attempts followed by successful password reset requests
- Unusual password reset activity from unfamiliar IP addresses
- Access to ResetUserInfo.php without preceding login events
Network Indicators:
- HTTP POST requests to ResetUserInfo.php without authentication headers
- Unusual traffic patterns to the password reset endpoint
SIEM Query:
source="web_logs" AND (url="*ResetUserInfo.php*" AND NOT user_agent="*authenticated*")