The admin command in ceph-deploy before 1.5.25 uses world-readable permissions for /etc/ceph/ceph.client.admin.keyring, which allows local users to obtain sensitive information by reading the file.
http://www.securityfocus.com/bid/74775
http://www.openwall.com/lists/oss-security/2015/05/22/1
http://www.openwall.com/lists/oss-security/2015/04/09/9