Create vulnerable.swift

[varunsh-coder]

This vulnerable code is from iGoat-Swift.

[step-security-bot]

Please find StepSecurity AI-CodeWise code comments below.

Code Comments

vulnerable.swift

• [High]Use parameterized queries rather than concatenating strings with input values
  The current implementation is vulnerable to SQL injection, as it uses string concatenation to include input values in a SQL query. Use parameterized queries which can be thought of as having placeholders rather than inserting input values directly into SQL statements. A parameterized query is a precompiled SQL statement with placeholders for parameters. The query is compiled only once, thus eliminates the possibility of SQL injection attacks. In the current code, instead of directly including the searchStr variable, the query can be restructured to have placeholders and the actual values can be provided as parameters to the placeholder.
• [High]Ensure the database connection is closed properly in case of an error or exception
  The current implementation doesn't close the database connection if an error occurs while opening it, which can lead to resource leaks and unexpected behavior. Wrap the opening of the database connection in a try/catch block and add a finally block to ensure that the database connection is closed properly. In the current code, the sqlite3_close method should be called inside the finally block.
• [Medium]Validate user input and sanitize it before using in SQL queries
  The search string entered by the user is not validated or sanitized, which can lead to unexpected behavior and potential SQL injection attacks. Validate user input before using it in SQL queries. In addition, sanitize the input to prevent SQL injection. In the current code, this can be done by checking that the searchStr variable is not null or does not contain any SQL syntax. One way to do this would be to use a third-party library to sanitize the input or to escape any special characters in the input.
• [Low]Close the statement object before closing the database connection
  The current implementation finalizes the statement object but doesn't close it before closing the database connection. Add a call to sqlite3_finalize(stmt) before closing the database connection using sqlite3_close(db) in the current code.

Feedback

We appreciate your feedback in helping us improve the service! To provide feedback, please use emojis on this comment. If you find the comments helpful, give them a 👍. If they aren't useful, kindly express that with a 👎. If you have questions or detailed feedback, please create n GitHub issue in StepSecurity/AI-CodeWise.