The cert_revoke command in FreeIPA does not check for the "revoke certificate" permission, which allows remote authenticated users to revoke arbitrary certificates by leveraging the "retrieve certificate" permission.
https://git.fedorahosted.org/cgit/freeipa.git/commit/?id=cf74584d0f772f3f5eccc1d30c001e4212a104fd
https://fedorahosted.org/freeipa/ticket/6232
http://www.securityfocus.com/bid/92525
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html