ping in Solaris 2.3 through 2.6 allows local users to cause a denial of service (crash) via a ping request to a multicast address through the loopback interface, e.g. via ping -i.
The access permissions for a UNIX domain socket are ignored in Solaris 2.x and SunOS 4.x, and other BSD-based operating systems before 4.4, which could allow local users to connect to the socket and possibly disrupt or control the operations of the program using that socket.