SQL Injection Vulnerability in Simple Inventory System

A SQL injection vulnerability has been identified in Simple Inventory System version 1.0, a product developed by code-projects. The vulnerability resides within the /delete.php file, which fails to properly neutralize user-supplied input provided via the 'ID' parameter before passing it to the database. This flaw allows an unauthenticated remote attacker to perform SQL injection attacks, potentially resulting in unauthorized data access, modification, or deletion within the underlying database. The vulnerability has been publicly disclosed with proof-of-concept material available, increasing the risk of exploitation by opportunistic actors. Organizations utilizing this software should restrict network access to the application or apply compensating controls at the web application firewall level to block malicious SQL syntax in requests to the delete.php endpoint.

Attack Chain

1. The attacker identifies an instance of Simple Inventory System 1.0 exposed to the internet.
2. The attacker crafts an HTTP GET or POST request targeting the /delete.php endpoint.
3. The attacker injects malicious SQL syntax into the 'ID' parameter of the request.
4. The application processes the request and concatenates the tainted 'ID' input directly into an SQL query string.
5. The backend database executes the manipulated query containing the attacker's payload.
6. The application returns database information, or the query modifies/deletes database records based on the injected command.
7. The attacker achieves unauthorized access, data exfiltration, or denial of service against the inventory database.

Impact

Successful exploitation of this vulnerability allows unauthenticated remote attackers to compromise the application's database. Depending on the database configuration and permissions, this could lead to the complete exfiltration of sensitive inventory data, modification of existing records, or deletion of the entire database, resulting in a significant loss of integrity and availability for the affected system.

Recommendation

1. Deploy the provided Sigma rule to web server access logs to detect and block suspicious SQL injection attempts targeting the delete.php file.
2. Implement strict input validation and sanitization for the 'ID' parameter in the /delete.php script to ensure it only accepts expected numeric values.
3. Configure the web application firewall (WAF) to inspect and block requests to /delete.php that contain SQL control characters like single quotes, comments (--), or union select statements.
4. Restrict access to the application to trusted internal networks if it does not require public internet exposure.