PHP 5.3.5 - 'grapheme_extract()' Null Pointer Dereference Denial of Service

Author: Maksymilian Arciemowicz
type: dos
platform: php
port: nan
date_added: 2011-02-17 
date_updated: 2014-11-24 
verified: 1 
codes: CVE-2011-0420;OSVDB-73275 
tags: 
aliases:  
screenshot_url:  
application_url: 

source: https://www.securityfocus.com/bid/46429/info

PHP is prone to a denial-of-service vulnerability caused by a NULL-pointer dereference.

An attacker can exploit this issue to cause an appliation written in PHP to crash, denying service to legitimate users.

PHP 5.3.5 is vulnerable; other versions may also be affected.

The following proof-of-concept is available:

grapheme_extract('a',-1);