Gentoo has issued an update for krb5. This fixes some vulnerabilities, which can potentially be exploited by malicious people to cause a DoS (Denial of Service) or compromise a vulnerable system.

For more information:
SA23690
SA23696

Solution
Update to "app-crypt/mit-krb5-1.5.2" or later.
Original Advisory
http://www.gentoo.org/security/en/glsa/glsa-200701-21.xml

Other references
Further details available to Secunia VIM customers

Deep Links
Links available to Secunia VIM customers