CVE-2023-39850
📋 TL;DR
Schoolmate v1.3 contains SQL injection vulnerabilities in the DeleteFunctions.php file via the $courseid and $teacherid parameters. Attackers can execute arbitrary SQL commands, potentially compromising the database. All users running Schoolmate v1.3 are affected.
💻 Affected Systems
- Schoolmate
📦 What is this software?
Schoolmate by Schoolmate Project
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise allowing data theft, modification, or deletion, and potential remote code execution if database permissions allow.
Likely Case
Unauthorized data access, manipulation of student/teacher records, and potential privilege escalation.
If Mitigated
Limited impact with proper input validation and database permission restrictions in place.
🎯 Exploit Status
Exploitation requires authentication but is straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Not available
Vendor Advisory: Not available
Restart Required: No
Instructions:
No official patch available. Consider upgrading to a newer version if available or implementing workarounds.
🔧 Temporary Workarounds
Input Validation and Parameterized Queries
allModify DeleteFunctions.php to validate and sanitize $courseid and $teacherid parameters before use in SQL queries.
Edit DeleteFunctions.php to implement parameterized queries or proper input validation
Web Application Firewall (WAF)
allDeploy a WAF with SQL injection protection rules to block malicious requests.
Configure WAF rules to detect and block SQL injection patterns
🧯 If You Can't Patch
- Restrict database user permissions to minimum required
- Implement network segmentation to isolate the Schoolmate application
🔍 How to Verify
Check if Vulnerable:
Check if running Schoolmate v1.3 by examining version files or application metadata.Check Version:
Check version.txt or similar files in the Schoolmate installation directory.Verify Fix Applied:
Test the DeleteFunctions.php endpoints with SQL injection payloads to ensure they are properly sanitized.📡 Detection & Monitoring
Log Indicators:
- Unusual SQL queries in application logs
- Multiple failed delete attempts with malformed parameters
Network Indicators:
- HTTP requests to DeleteFunctions.php with SQL injection patterns in parameters
SIEM Query:
source="web_logs" AND uri="*DeleteFunctions.php*" AND (param="*courseid*" OR param="*teacherid*") AND (payload="*' OR*" OR payload="*;--*" OR payload="*UNION*" OR payload="*SELECT*" OR payload="*INSERT*" OR payload="*UPDATE*" OR payload="*DELETE*")