krb5 -- ASN.1 decoder denial-of-service vulnerability

An advisory published by the MIT Kerberos team says:

The ASN.1 decoder library in the MIT Kerberos 5 distribution
is vulnerable to a denial-of-service attack causing an infinite
loop in the decoder. The KDC is vulnerable to this attack.
An unauthenticated remote attacker can cause a KDC or application
server to hang inside an infinite loop.
An attacker impersonating a legitimate KDC or application
server may cause a client program to hang inside an infinite
loop.