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[3.4] krb5: S4U2Self KDC crash when anon is restricted (CVE-2016-3120)
The validate_as_request function in kdc_util.c in the Key Distribution Center in MIT Kerberos 5 before 1.13.6 and 1.4.x before 1.14.3, when restrict_anonymous_to_tgt is enabled, uses an incorrect client data structure, which allows remote authenticated users to cause a denial of service via an S4U2Self request.
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