Lord of SQL injection – golem

Level 11

Source Code

<?php 
  include "../config.php"; 
  login_chk(); 
  dbconnect(); 
  if(preg_match('/prob|_|\.|\(\)/i', $_GET[pw])) exit("No Hack ~_~"); 
  if(preg_match('/or|and|substr\(|=/i', $_GET[pw])) exit("HeHe"); 
  $query = "select id from prob_golem where id='guest' and pw='{$_GET[pw]}'"; 
  echo "<hr>query : <strong>{$query}</strong><hr><br>"; 
  $result = @mysql_fetch_array(mysql_query($query)); 
  if($result['id']) echo "<h2>Hello {$result[id]}</h2>"; 
   
  $_GET[pw] = addslashes($_GET[pw]); 
  $query = "select pw from prob_golem where id='admin' and pw='{$_GET[pw]}'"; 
  $result = @mysql_fetch_array(mysql_query($query)); 
  if(($result['pw']) && ($result['pw'] == $_GET['pw'])) solve("golem"); 
  highlight_file(__FILE__); 
?>

Analyse

http://los.sandbox.cash/golem-~~.php?pw=123 이라고 입력하게 되면
select id from prob_golem where id='guest' and pw='123' and 1=0과 같이 MySQL 쿼리문이 입력된다.
그리고 5번째 줄에서 ‘or’, ‘and’, ‘substr(‘, ‘=’이 필터링 되어있다.
 15번째 줄을 보면 &result['pw']에 admin의 pw가 들어가야만 golem문제가 풀린다.

Frist Hint is next page