The spnego_gss_accept_sec_context function in
lib/gssapi/spnego/spnego_mech.c in MIT Kerberos 5 (aka krb5) 1.5
through 1.6.3, when SPNEGO is used, allows remote attackers to cause a
denial of service (NULL pointer dereference and daemon crash) via
invalid ContextFlags data in the reqFlags field in a negTokenInit
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