The pkinit_check_kdc_pkid function in
plugins/preauth/pkinit/pkinit_crypto_openssl.c in the PKINIT
implementation in the Key Distribution Center (KDC) in MIT Kerberos 5
(aka krb5) before 1.10.4 and 1.11.x before 1.11.1 does not properly
handle errors during extraction of fields from an X.509 certificate,
which allows remote attackers to cause a denial of service (NULL
pointer dereference and daemon crash) via a malformed
KRB5_PADATA_PK_AS_REQ AS-REQ request.
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