文章目錄
- 1、low
- 2、medium
- 3、high
- 4、impossible
1、low
源碼解析:
<?php
header ("X-XSS-Protection: 0");
// Is there any input?
if( array_key_exists( "name", $_GET ) && $_GET[ 'name' ] != NULL ) {
// Feedback for end user
echo '<pre>Hello ' . $_GET[ 'name' ] . '</pre>';
}
?>
源碼無防護,支援XSS攻擊即可;
結果驗證:
2、medium
源碼解析:
<?php
header ("X-XSS-Protection: 0");
// Is there any input?
if( array_key_exists( "name", $_GET ) && $_GET[ 'name' ] != NULL ) {
// Get input
$name = str_replace( '<script>', '', $_GET[ 'name' ] );
// Feedback for end user
echo "<pre>Hello ${name}</pre>";
}
?>
源碼中str_replace函數區分大小寫;
結果驗證:
3、high
源碼解析:
<?php
header ("X-XSS-Protection: 0");
// Is there any input?
if( array_key_exists( "name", $_GET ) && $_GET[ 'name' ] != NULL ) {
// Get input
$name = preg_replace( '/<(.*)s(.*)c(.*)r(.*)i(.*)p(.*)t/i', '', $_GET[ 'name' ] );
// Feedback for end user
echo "<pre>Hello ${name}</pre>";
}
?>
源碼過濾script的正規表達式,可以使用其他标簽進行XSS;
4、impossible
<?php
// Is there any input?
if( array_key_exists( "name", $_GET ) && $_GET[ 'name' ] != NULL ) {
// Check Anti-CSRF token
checkToken( $_REQUEST[ 'user_token' ], $_SESSION[ 'session_token' ], 'index.php' );
// Get input
$name = htmlspecialchars( $_GET[ 'name' ] );
// Feedback for end user
echo "<pre>Hello ${name}</pre>";
}
// Generate Anti-CSRF token
generateSessionToken();
?>