CVE-2009-4418 Information

Description

The unserialize function in PHP 5.3.0 and earlier allows context-dependent attackers to cause a denial of service (resource consumption) via a deeply nested serialized variable as demonstrated by a string beginning with a:1: followed by many a:1: sequences.

Reference

http://www.suspekt.org/2009/11/28/shocking-news-in-php-exploitation/ http://www.suspekt.org/downloads/POC2009-ShockingNewsInPHPExploitation.pdf