CVE-2021-26762
📋 TL;DR
This SQL injection vulnerability in PHPGurukul Student Record System 4.0 allows remote attackers to execute arbitrary SQL statements via the cid parameter in edit-course.php. This can lead to unauthorized data access, modification, or deletion. Any organization using this specific version of the software is affected.
💻 Affected Systems
- PHPGurukul Student Record System
📦 What is this software?
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise including data theft, data destruction, and potential remote code execution if database permissions allow.
Likely Case
Unauthorized access to student records, course data, and potentially administrative credentials stored in the database.
If Mitigated
Limited impact with proper input validation and database permission restrictions in place.
🎯 Exploit Status
Exploit code is publicly available and requires minimal technical skill to execute.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch available. Consider migrating to alternative software or implementing custom fixes.
🔧 Temporary Workarounds
Input Validation Filter
allAdd input validation to sanitize the cid parameter before processing
Modify edit-course.php to validate cid parameter as integer: if(!is_numeric($_GET['cid'])) { die('Invalid input'); }
Web Application Firewall
allDeploy WAF rules to block SQL injection attempts
Configure WAF to block requests containing SQL keywords in cid parameter
🧯 If You Can't Patch
- Isolate the system from internet access and restrict to internal network only
- Implement strict network segmentation and monitor all database queries
🔍 How to Verify
Check if Vulnerable:
Test by accessing edit-course.php with malicious cid parameter like: edit-course.php?cid=1' OR '1'='1Check Version:
Check PHPGurukul version in system configuration or about pageVerify Fix Applied:
Test the same SQL injection attempts after implementing fixes to ensure they are blocked📡 Detection & Monitoring
Log Indicators:
- Unusual SQL errors in web server logs
- Multiple failed login attempts from single IP
- Database queries with unusual patterns
Network Indicators:
- HTTP requests to edit-course.php with SQL keywords in parameters
- Unusual database connection patterns
SIEM Query:
source="web_logs" AND uri="*edit-course.php*" AND (param="*UNION*" OR param="*SELECT*" OR param="*OR*'1'='1*")