CVE-2021-26223
📋 TL;DR
CVE-2021-26223 is a critical SQL injection vulnerability in CASAP Automated Enrollment System v1.0 that allows remote attackers to execute arbitrary SQL commands via the id parameter in view_pay.php. This enables attackers to read, modify, or delete database content, potentially leading to complete system compromise. Organizations using this specific software version are affected.
💻 Affected Systems
- CASAP Automated Enrollment System
📦 What is this software?
Casap Automated Enrollment System by Casap Automated Enrollment System Project
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data destruction, authentication bypass, and remote code execution on the underlying server.
Likely Case
Unauthorized access to sensitive enrollment data, modification of student records, and potential privilege escalation within the application.
If Mitigated
Limited impact with proper input validation, parameterized queries, and network segmentation in place.
🎯 Exploit Status
The exploit requires simple HTTP requests with SQL injection payloads in the id parameter. No authentication is needed.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
1. Review the vulnerable code in view_pay.php
2. Replace direct parameter concatenation with parameterized queries
3. Implement proper input validation for the id parameter
4. Test the fix thoroughly before deployment
🔧 Temporary Workarounds
Web Application Firewall (WAF) Rules
allDeploy WAF rules to block SQL injection patterns in the id parameter
WAF-specific configuration commands vary by vendor
Input Validation Filter
allAdd server-side validation to restrict id parameter to expected values
Implement regex validation: /^[0-9]+$/ for numeric IDs
🧯 If You Can't Patch
- Isolate the vulnerable system behind a firewall with strict access controls
- Implement network segmentation to limit access to the application
🔍 How to Verify
Check if Vulnerable:
Send a test request to view_pay.php with SQL injection payload like: view_pay.php?id=1' OR '1'='1Check Version:
Check application version in admin panel or configuration filesVerify Fix Applied:
Test with SQL injection payloads and verify they are rejected or sanitized📡 Detection & Monitoring
Log Indicators:
- Unusual SQL error messages in application logs
- Multiple failed login attempts following SQL injection patterns
- Requests to view_pay.php with unusual id parameter values
Network Indicators:
- HTTP requests containing SQL keywords (SELECT, UNION, etc.) in parameters
- Abnormal database query patterns from the application server
SIEM Query:
source="web_logs" AND uri="*view_pay.php*" AND (param="*id=*'*" OR param="*id=*%27*")