CVE-2020-28133
📋 TL;DR
This vulnerability allows attackers to bypass authentication in Simple Grocery Store Sales And Inventory System 1.0 via SQL injection in the login functionality. Attackers can gain client privileges without valid credentials. All installations of version 1.0 are affected.
💻 Affected Systems
- Simple Grocery Store Sales And Inventory System
📦 What is this software?
Simple Grocery Store Sales And Inventory System by Simple Grocery Store Sales And Inventory Sales Project
View all CVEs affecting Simple Grocery Store Sales And Inventory System →
⚠️ Risk & Real-World Impact
Worst Case
Full system compromise allowing attackers to access, modify, or delete all sales and inventory data, potentially leading to financial loss and data breach.
Likely Case
Unauthorized access to client-level functionality, allowing viewing and manipulation of sales data, inventory levels, and customer information.
If Mitigated
Limited impact with proper network segmentation and monitoring, though authentication bypass remains possible.
🎯 Exploit Status
Public exploit code available on Exploit-DB. SQL injection in login.php allows authentication bypass with simple payloads.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: None available
Vendor Advisory: None available
Restart Required: No
Instructions:
No official patch exists. Consider replacing with secure alternative software or implementing custom fixes.
🔧 Temporary Workarounds
Input Validation and Prepared Statements
allModify login.php to use parameterized queries and validate user input
Replace vulnerable SQL queries with prepared statements using mysqli or PDO
Web Application Firewall
allDeploy WAF to block SQL injection attempts
Configure WAF rules to detect and block SQL injection patterns in login requests
🧯 If You Can't Patch
- Isolate the system behind a firewall with strict access controls
- Implement network segmentation to limit lateral movement if compromised
🔍 How to Verify
Check if Vulnerable:
Test login.php with SQL injection payloads like ' OR '1'='1 in username/password fieldsCheck Version:
Check system version in admin panel or review source code commentsVerify Fix Applied:
Attempt SQL injection after modifications - should return authentication failure instead of successful login📡 Detection & Monitoring
Log Indicators:
- Multiple failed login attempts with SQL patterns
- Successful logins from unusual IPs
- Login attempts with special characters in credentials
Network Indicators:
- HTTP POST requests to login.php containing SQL keywords
- Unusual authentication traffic patterns
SIEM Query:
source="web_logs" AND (uri="/sales_inventory/login.php" AND (request_body LIKE "%OR%" OR request_body LIKE "%'%" OR request_body LIKE "%--%"))🔗 References
- https://www.exploit-db.com/exploits/48879
- https://www.sourcecodester.com/php/14461/simple-grocery-store-sales-and-inventory-system-using-phpmysql-source-code.html
- https://www.exploit-db.com/exploits/48879
- https://www.sourcecodester.com/php/14461/simple-grocery-store-sales-and-inventory-system-using-phpmysql-source-code.html
