Identify CWEs

Vulnerability Analysis: Python/SQLite Code Snippet1. Identified CWECWE-89: Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection'). 2. Security Implications and Attack ScenariosImplications: The code directly concatenates user-provided input into the SQL query string. Because the input is not sanitized or parameterized, an attacker can break out of the intended SQL command structure. Attack Scenario: An attacker could provide a malicious username string such as ' OR '1'='1. The resulting query would become SELECT * FROM users WHERE username='' OR '1'='1';. Since '1'='1' is always true, this query would return the first user record in the database regardless of the username, potentially bypassing authentication mechanisms. A more sophisticated attacker could use this to exfiltrate the entire user database or delete tables entirely. 3. Recommended MitigationTo mitigate this, you must use parameterized queries (also known as prepared statements). This approach separates the SQL command logic from the data, ensuring that the database driver treats the user input strictly as data and never as executable code.Corrected Code:Pythonimport sqlite3

def get_user(username):
conn = sqlite3.connect('users.db')
cursor = conn.cursor()
# Use '?' as a placeholder for the parameter
query = "SELECT * FROM users WHERE username=?;"
# Pass the user input as a tuple in the execute method
cursor.execute(query, (username,))
user = cursor.fetchone()
conn.close()
return user
By using the ? placeholder, the SQLite library automatically handles the escaping and quoting of the username variable, effectively neutralizing the SQL Injection weakness.