Updated kerberos packages fix various vulnerabilities

Updated Kerberos packages for Red Hat Linux 9 fix a number of
vulnerabilities found in MIT Kerberos.

Kerberos is a network authentication system. The MIT Kerberos team
released an advisory describing a number of vulnerabilities that affect the
kerberos packages shipped as part of Red Hat Linux 9. These issues include:

Vulnerabilities have been found in the triple-DES key support found in the
implementation of the Kerberos IV authentication protocol included in MIT
Kerberos. The Common Vulnerabilities and Exposures project has assigned
the name CAN-2003-0139 to this issue.

Vulnerabilities have been found in the Kerberos IV authentication protocol
which allow an attacker with knowledge of a cross-realm key, which is
shared with another realm, to impersonate any principal in that realm to
any service in that realm. This vulnerability can only be closed by
disabling cross-realm authentication in Kerberos IV (CAN-2003-0138).

Vulnerabilities have been found in the RPC library used by the kadmin
service in Kerberos 5. A faulty length check in the RPC library exposes
kadmind to an integer overflow which can be used to crash kadmind
(CAN-2003-0028).

The Key Distribution Center (KDC) allows remote, authenticated attackers
to cause a denial of service (crash) on KDCs within the same realm via a
certain protocol request that causes the KDC to corrupt its heap
(CAN-2003-0082).

All users of Kerberos are advised to upgrade to these errata packages,
which disable cross-realm authentication by default for Kerberos IV and
which contain patches that correct these issues.

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade. Only those
RPMs which are currently installed will be updated. Those RPMs which are
not installed but included in the list will not be updated. Note that you
can also use wildcards (*.rpm) if your current directory *only* contains the
desired RPMs.

Please note that this update is also available via Red Hat Network. Many
people find this an easier way to apply updates. To use Red Hat Network,
launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate
RPMs being upgraded on your system.

https://www.redhat.com/security/data/cve/CVE-2003-0028.html
https://www.redhat.com/security/data/cve/CVE-2003-0082.html
https://www.redhat.com/security/data/cve/CVE-2003-0138.html
https://www.redhat.com/security/data/cve/CVE-2003-0139.html
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-005-buf.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-004-krb4.txt
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2003-003-xdr.txt

krb5