SQL 注入可以超越 POST 和 GET 请求吗？

Can SQL Injections Occur Beyond POST and GET Requests?

SQL injections exploit vulnerabilities in web applications that inadequately sanitize user input before incorporating it into SQL queries. While POST and GET methods are common avenues for this attack, SQL injections can occur through other means as well.

In the provided code, mysql_real_escape_string is employed to encode user inputs, mitigating the risk of SQL injection. However, the code's security relies heavily on the consistent application of this encoding.

Examining the Example Code

1. POST Method

The code example initializes variables with user input:

$name = trim($_POST['username']);
$mail = trim($_POST['email']);
$password = trim($_POST['password ']);

Before storing the user's information in a database, it is adequately encoded:

$sql =
"INSERT INTO
   clients
 SET
   name='" . mysql_real_escape_string($name) . "',
   mail='" . mysql_real_escape_string($mail) . "',
   password='" . mysql_real_escape_string(sha1($password)) . "'";

2. GET Method

Variables are initialized from the URL:

$videoID = trim($_GET['videoID']);
$userID = trim($_GET['userID']);

Again, the SQL query employs the appropriate encoding:

$sql =
"SELECT
   videoID
 FROM
   likes
 WHERE
   videoID = '" . mysql_real_escape_string($videoID) . "' AND UID = '" . mysql_real_escape_string($userID) . "' LIMIT 1";

Conclusion

The code you provided contains no SQL injection vulnerabilities, thanks to the consistent use of mysql_real_escape_string to encode user inputs. It is imperative to note that encoding must be applied judiciously to all user input regardless of its source. To enhance security further, consider adopting the more modern approach of using PDO with prepared statements.

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