test: Add vulnerable Python file for security testing

test_vulnerable.py

@@ -0,0 +1,19 @@
+import os
+import sqlite3
+
+def login_user(username, password):
+    # VULNERABILITY: SQL Injection
+    conn = sqlite3.connect('users.db')
+    cursor = conn.cursor()
+    query = f"SELECT * FROM users WHERE username='{username}' AND password='{password}'"
+    cursor.execute(query)
+    return cursor.fetchone()
+
+def execute_command(cmd):
+    # VULNERABILITY: Command Injection
+    os.system(f"ping -c 1 {cmd}")
+
+def read_file(filename):
+    # VULNERABILITY: Path Traversal
+    with open(f"/var/data/{filename}", 'r') as f:
+        return f.read()