MIT Kerberos 5 (aka krb5) through 1.13.1 incorrectly expects that a
krb5_read_message data field is represented as a string ending with a
'\0' character, which allows remote attackers to (1) cause a denial of
service (NULL pointer dereference) via a zero-byte version string or
(2) cause a denial of service (out-of-bounds read) by omitting the
'\0' character, related to appl/user_user/server.c and
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