<?php
include "../../config.php";
if($_GET['view_source']) view_source();
?><html>
<head>
<title>Challenge 11</title>
<style type="text/css">
body { background:black; color:white; font-size:10pt; }
</style>
</head>
<body>
<center>
<br><br>
<?php
$pat="/[1-3][a-f]{5}_.*$_SERVER[REMOTE_ADDR].*\tp\ta\ts\ts/";
if(preg_match($pat,$_GET['val'])){
solve(11);
}
else echo("<h2>Wrong</h2>");
echo("<br><br>");
?>
<a href=./?view_source=1>view-source</a>
</center>
</body>
</html>GET 변수 val의 값이 정규식 패턴 $pat과 일치하면 문제가 풀린다.
https://webhacking.kr/challenge/code-2/?val=1aaaaa_58.142.186.55%09p%09a%09s%09s
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