The prep_reprocess_req function in do_tgs_req.c in the Key
Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.10.5
does not properly perform service-principal realm referral, which
allows remote authenticated users to cause a denial of service (NULL
pointer dereference and daemon crash) via a crafted TGS-REQ request.
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