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Vigil@nce: PHP, double free of SplObjectStorage

July 2010 by Vigil@nce

This bulletin was written by Vigil@nce : http://vigilance.fr/

SYNTHESIS OF THE VULNERABILITY

When a PHP application unserializes malicious SplObjectStorage
data, a double memory free occurs, and can lead to code execution.

 Severity: 2/4
 Creation date: 25/06/2010

DESCRIPTION OF THE VULNERABILITY

The SplObjectStorage class stores objects.

The SplObjectStorage::serialize() method converts an object to a
string. The SplObjectStorage::unserialize() method performs the
reverse operation.

However, SplObjectStorage::unserialize() can free a memory area
which is already freed, so it corrupts the memory.

When a PHP application unserializes malicious SplObjectStorage
data, a double memory free thus occurs, and can lead to code
execution.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/PHP-double-free-of-SplObjectStorage-9728


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