CFNetwork in Safari in Apple Mac OS X before 10.5.3 automatically sends an SSL client certificate in response to a web server's certificate request, which allows remote web sites to obtain sensitive information (Subject data) from personally identifiable certificates, and use arbitrary certificates to track user activities across domains, a related issue to CVE-2007-4879.
https://exchange.xforce.ibmcloud.com/vulnerabilities/42708
http://www.vupen.com/english/advisories/2008/1697
http://www.us-cert.gov/cas/techalerts/TA08-150A.html
http://www.securityfocus.com/bid/29493
http://www.securityfocus.com/bid/29412
http://securitytracker.com/id?1020134
http://secunia.com/advisories/30430
http://lists.apple.com/archives/security-announce/2008//May/msg00001.html