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Helmut Grohne discovered a flaw in Heimdal, an implementation of
Kerberos 5 that aims to be compatible with MIT Kerberos. The backports
of fixes for CVE-2022-3437 accidentally inverted important memory
comparisons in the arcfour-hmac-md5 and rc4-hmac integrity check
handlers for gssapi, resulting in incorrect validation of message
integrity codes.