CVE-2021-25202
📋 TL;DR
This CVE describes a SQL injection vulnerability in the SourceCodester Sales and Inventory System v1.0 that allows remote attackers to execute arbitrary SQL statements via the id parameter in the inventory.php admin page. This affects all users running the vulnerable version of this software, potentially compromising the entire database.
💻 Affected Systems
- SourceCodester Sales and Inventory System
📦 What is this software?
Sales And Inventory System by Sales And Inventory System Project
⚠️ Risk & Real-World Impact
Worst Case
Complete database compromise leading to data theft, data manipulation, authentication bypass, and potential remote code execution if database functions allow it.
Likely Case
Unauthorized data access, data exfiltration, and potential privilege escalation within the application.
If Mitigated
Limited impact with proper input validation and parameterized queries in place.
🎯 Exploit Status
Exploitation requires access to the admin interface but SQL injection is straightforward once authenticated.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Unknown
Vendor Advisory: No official vendor advisory found
Restart Required: No
Instructions:
No official patch available. Implement workarounds or manually fix the vulnerable code.
🔧 Temporary Workarounds
Input Validation and Sanitization
allAdd server-side validation to sanitize the id parameter before processing.
Modify inventory.php to validate id parameter as integer: if(!is_numeric($_GET['id'])) { die('Invalid input'); }
Parameterized Queries Implementation
allReplace dynamic SQL queries with prepared statements using PDO or mysqli.
Replace raw SQL queries with: $stmt = $pdo->prepare('SELECT * FROM inventory WHERE id = ?'); $stmt->execute([$id]);
🧯 If You Can't Patch
- Implement WAF rules to block SQL injection patterns targeting the id parameter
- Restrict access to the admin interface using IP whitelisting or VPN
🔍 How to Verify
Check if Vulnerable:
Test the inventory.php page with SQL injection payloads in the id parameter (e.g., id=1' OR '1'='1)Check Version:
Check system version in admin panel or readme filesVerify Fix Applied:
Test with same payloads after implementing fixes - should return error or no data instead of executing SQL📡 Detection & Monitoring
Log Indicators:
- Unusual SQL errors in web server logs
- Multiple failed login attempts followed by inventory.php access
- Suspicious parameter values containing SQL keywords
Network Indicators:
- HTTP requests to inventory.php with SQL injection patterns in parameters
- Unusual database query patterns from web server
SIEM Query:
web.url:*inventory.php* AND (web.param.id:*OR* OR web.param.id:*UNION* OR web.param.id:*SELECT*)