When developers directly concatenate

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To get the latest entrepreneurial news and community dynamics Please enter your email . Statement structure The attacker embeds malicious code into the condition part of the SQL query, for example SELECT FROM users WHERE username OR 11. Classic Case Analysis . Login Bypass Scenario The attacker enters OR 11 into the username or password field of the login form. Result The SQL query always succeeds and the attacker successfully bypasses authentication and accesses the protected system. . Data leakage scenario The attacker obtains all user data by entering UNION SELECT username, password FROM users in the search box. Result.

Sensitive data is directly exposed, and the attacker further uses this information belgium telegram number to perform more attacks. . Data tampering scenario Use DROP TABLE orders to delete the key business data table. Result The key table in the database is deleted or tampered with, causing the system to fail to operate normally. . Full takeover scenario Inject malicious code, such as creating a highprivileged user INSERT INTO users username, password, role VALUES hacker, 1234, admin. Result The attacker has administrator privileges and full control of the system. Defense methods 1. Use prepared statements and parameterized queries, such as using PreparedStatement in.

Java, to ensure that SQL statements and user input are strictly separated. 2. Example String query SELECT FROM users WHERE username ? AND password ? PreparedStatement stmt connection.prepareStatementquery stmt.setString1, username stmt.setString2, password ResultSet rs stmt.executeQuery 3. Input validation and filtering Implement a whitelist strategy to allow only legal characters. Remove special characters such as , , , etc. from input. 4. Applicationlevel hardening Use a Web Application Firewall WAF to filter common SQL injection attack patterns. Limit the execution time of each query to prevent longterm resource occupation. 5. Minimize database permissions and grant application accounts only the required read.