Apple Safari before 6.0.1 does not properly handle the Quarantine attribute of HTML documents, which allows user-assisted remote attackers to read arbitrary files by leveraging the presence of a downloaded document.
https://exchange.xforce.ibmcloud.com/vulnerabilities/78679
http://www.securityfocus.com/bid/55624
http://support.apple.com/kb/HT5502
http://lists.apple.com/archives/security-announce/2012/Sep/msg00005.html