CVE-2025-65594
📋 TL;DR
OpenSIS 9.2 and below contains an incorrect access control vulnerability in Student.php that allows authenticated low-privilege users to perform unauthorized database write operations on other users' data. This enables data manipulation and potential privilege escalation. All OpenSIS installations running vulnerable versions are affected.
💻 Affected Systems
- OpenSIS
📦 What is this software?
Opensis by Os4ed
⚠️ Risk & Real-World Impact
Worst Case
Attackers could modify or delete critical student records, alter grades, change enrollment statuses, or escalate privileges to administrative access, potentially compromising the entire student information system.
Likely Case
Malicious users or compromised accounts modifying student data they shouldn't have access to, leading to data integrity issues, grade manipulation, or unauthorized record changes.
If Mitigated
With proper access controls and monitoring, impact is limited to attempted unauthorized writes that are blocked and logged for investigation.
🎯 Exploit Status
Exploitation details are publicly available in the GitLab repository. The vulnerability requires authenticated access but is straightforward to exploit once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: http://opensis.com
Restart Required: No
Instructions:
Check the OpenSIS website for security updates. Upgrade to a version above 9.2 when available. Review and apply access control fixes to Student.php.
🔧 Temporary Workarounds
Implement Additional Access Control Checks
allAdd user permission validation before allowing database write operations in Student.php
# Manual code review and modification of Student.php to add proper authorization checks
Restrict Database Write Permissions
allLimit database user permissions to only necessary operations
# Database-specific commands to revoke unnecessary write permissions
🧯 If You Can't Patch
- Implement strict network segmentation to isolate OpenSIS from other critical systems
- Enable detailed logging of all database write operations and monitor for unauthorized access patterns
🔍 How to Verify
Check if Vulnerable:
Check OpenSIS version. If running 9.2 or below, review Student.php for missing access control checks on database write operations.Check Version:
Check OpenSIS admin panel or configuration files for version informationVerify Fix Applied:
Test with low-privilege accounts attempting to modify other users' data. Verify proper authorization errors are returned.📡 Detection & Monitoring
Log Indicators:
- Multiple failed authorization attempts on Student.php
- Database write operations from low-privilege accounts affecting other users' data
- Unusual patterns of data modification
Network Indicators:
- HTTP POST requests to Student.php endpoints from unauthorized user accounts
- Unusual database transaction volumes
SIEM Query:
source="opensis_logs" AND (uri="/Student.php" OR uri LIKE "%/Student.php%") AND (user_role="student" OR user_role="teacher") AND action="write" AND status="200"