CVE-2007-1522

Double free vulnerability in the session extension in PHP 5.2.0 and 5.2.1
allows context-dependent attackers to execute arbitrary code via illegal
characters in a session identifier, which is rejected by an internal
session storage module, which calls the session identifier generator with
an improper environment, leading to code execution when the generator is
interrupted, as demonstrated by triggering a memory limit violation or
certain PHP errors.

Notes