The Security Framework in Apple Mac OS X 10.3.9, and 10.4.x before 10.4.7, does not properly search certificate revocation lists (CRL), which allows remote attackers to access systems by using revoked certificates.
docs.info.apple.com/article.html?artnum=304829
lists.apple.com/archives/security-announce/2006/Nov/msg00001.html
secunia.com/advisories/23155
securitytracker.com/id?1017298
www.osvdb.org/30728
www.securityfocus.com/bid/21335
www.us-cert.gov/cas/techalerts/TA06-333A.html
www.vupen.com/english/advisories/2006/4750