The indexing functionality in Spotlight in Apple OS X before 10.10.2 writes memory contents to an external hard drive, which allows local users to obtain sensitive information by reading from this drive.
https://exchange.xforce.ibmcloud.com/vulnerabilities/100528
http://www.securitytracker.com/id/1031650
http://support.apple.com/HT204244
http://lists.apple.com/archives/security-announce/2015/Jan/msg00003.html