security_taskgate in Apple OS X before 10.10.2 allows attackers to read group-ACL-restricted keychain items of arbitrary apps via a crafted app with a signature from a (1) self-signed certificate or (2) Developer ID certificate.
https://exchange.xforce.ibmcloud.com/vulnerabilities/100526
http://www.securitytracker.com/id/1031650
http://support.apple.com/HT204244
http://lists.apple.com/archives/security-announce/2015/Jan/msg00003.html