SQL Injection: Non-Constant SQL Statement in ApplyCouponView.post

[deepharness]

Harness Pipeline

Describe the vulnerability:
The vulnerability is a SQL injection (CWE-89) that occurs when untrusted input from an attacker is inserted into a SQL statement without proper validation or escaping. This allows the attacker to manipulate the SQL query, potentially gaining unauthorized access to or altering sensitive data in the database.

Concepts behind remediation:
To remediate SQL injection vulnerabilities, it is essential to use parameterized statements or prepared statements. These techniques ensure that user inputs are treated as data rather than executable code, effectively preventing attackers from injecting malicious SQL commands. Additionally, employing an Object-Relational Mapping (ORM) library can help abstract SQL queries and enforce best practices.

Steps to remediate the vulnerability:

1. Identify all SQL statements in the ApplyCouponView.post method that use user input.
2. Replace any dynamic SQL statements that concatenate user inputs with parameterized queries or prepared statements.
   • For example, instead of using:

     cursor.execute("SELECT * FROM coupons WHERE code = '" + user_input + "'")

     Use:

     cursor.execute("SELECT * FROM coupons WHERE code = ?", (user_input,))

3. Validate and sanitize user inputs to ensure they conform to expected formats (e.g., length, type).
4. If applicable, implement an ORM library to handle database interactions, reducing the need for raw SQL queries.
5. Test the application to ensure that the changes prevent SQL injection while maintaining functionality.

Code suggestions may produce inaccurate results or introduce new vulnerabilities. Review the output carefully before use.