Summary
A critical SQL injection flaw in the Stock-Inventory-Management-System login flow allows unauthenticated attackers to manipulate the authentication query and potentially bypass login entirely. The same script also contains hardcoded administrative credentials, creating an independent path to unauthorized administrative access.
Affected context
The vulnerability occurs in the application's login.php authentication handler when user-supplied username and password values are copied into session variables and later concatenated directly into a SQL query. Deployments are at risk when the login endpoint is reachable remotely, database queries are built from untrusted values, and administrative credentials remain embedded in application source code.
Exploit preconditions
- Attack surface: The remotely accessible login form and its server-side authentication handler
- Required access: No prior authentication is required
- Trigger point: Processing submitted username and password values during login
- Why exploitation is possible: User-controlled values are inserted into a SQL statement without parameterization or effective escaping; a separate hardcoded credential check may also accept embedded administrative credentials
Why this happens
The primary defect is the construction of an authentication query through direct string concatenation of untrusted input. This permits input to alter SQL syntax and maps to CWE-89: Improper Neutralization of Special Elements used in an SQL Command (SQL Injection). The independent hardcoded credential condition reflects insecure credential management and weak authentication design because a fixed administrative secret is embedded in application logic rather than being securely managed and validated.
Potential impact
- An attacker may bypass authentication without a valid account
- Unauthorized users could gain access to administrative functionality
- Sensitive inventory, user, or operational data could be disclosed
- Application records could be modified, deleted, or poisoned
- Compromised administrative access could enable further attacks against connected systems
General mitigation guidance
Mitigation generally centers on removing SQL construction from raw input and eliminating embedded authentication secrets.
Common defensive patterns include:
- Use parameterized queries or prepared statements for every database operation
- Apply server-side allowlist validation appropriate to each input field
- Avoid relying on escaping as the primary SQL injection defense
- Store credentials through a managed secret mechanism and validate passwords using an appropriate password-hashing scheme
- Remove hardcoded administrative backdoors and require normal authorization checks
- Apply least privilege to the application database account and administrative roles
- Separate authentication, authorization, and session management responsibilities
How teams detect issues like this
Organizations can identify similar weaknesses through:
- Static analysis rules for SQL statements assembled with concatenation, interpolation, or session-derived values
- Code review checks for raw request data flowing into database APIs
- Searches for hardcoded usernames, passwords, and administrative conditional branches
- Dynamic testing of authentication endpoints with safely controlled invalid and boundary inputs
- Web application firewall or database monitoring policies that detect anomalous authentication-query behavior
- CI security policies that reject non-parameterized database access and embedded secrets
Automated code review and secret-scanning tools can help surface these patterns during development.
