Provide references for CVE-2009-4137.
Where can I find more information about CVE-2009-4137?
References are available at: http://www.openwall.com/lists/oss-security/2009/12/14/2, http://piwik.org/blog/2009/12/piwik-response-to-shocking-news-in-php-exploitation/, http://www.suspekt.org/downloads/POC2009-ShockingNewsInPHPExploitation.pdf, http://www.openwall.com/lists/oss-security/2009/12/10/1, http://www.openwall.com/lists/oss-security/2009/12/09/2, http://dev.piwik.org/trac/changeset/1637, http://www.suspekt.org/2009/12/09/advisory-032009-piwik-cookie-unserialize-vulnerability/, http://www.sektioneins.de/en/advisories/advisory-032009-piwik-cookie-unserialize-vulnerability/.