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krb5 -- unkeyed PAC checksum handling vulnerability

Description:

The MIT Kerberos team reports:

MIT krb5 incorrectly accepts an unkeyed checksum for PAC signatures.

An authenticated remote attacker can forge PACs if using a KDC that does not filter client-provided PAC data. This can result in privilege escalation against a service that relies on PAC contents to make authorization decisions.

References:

Affects:

portaudit: krb5 -- unkeyed PAC checksum handling vulnerability

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If you have found a vulnerability in a FreeBSD port not listed in the database, please contact the FreeBSD Security Team. Refer to "FreeBSD Security Information" for more information.


Oliver Eikemeier <eik@FreeBSD.org>