BackupFile
提示给了备份文件，试着访问 index.php.bak 拿到源码：
<?php
include_once "flag.php";
if(isset($_GET['key'])) {
$key = $_GET['key'];
if(!is_numeric($key)) {
exit("Just num!");
}
$key = intval($key);
$str = "123ffwsfwefwf24r2f32ir23jrw923rskfjwtsw54w3";
if($key == $str) {
echo $flag;
}
}
else {
echo "Try to find out source file!";
}
考察的是php弱类型比较，
?key=123
Last modified 8mo ago