Provide references for CVE-2006-1520.
Where can I find more information about CVE-2006-1520?
References are available at: https://exchange.xforce.ibmcloud.com/vulnerabilities/26535, http://www.vupen.com/english/advisories/2006/1846, http://permalink.gmane.org/gmane.mail.spam.spf.devel/849, http://www.gossamer-threads.com/lists/spf/devel/27053?page=last, http://www.libspf.org/index.html.