Updated krb5 packages fix remote buffer overflow

Updated Kerberos 5 packages are now available for Red Hat Linux 6.2, 7,
7.1, 7.2, and 7.3. These updates fix a buffer overflow in the XDR decoder.

Sun RPC is a remote procedure call framework which allows clients to invoke
procedures in a server process over a network. XDR is a mechanism for
encoding data structures for use with RPC.

The Kerberos 5 network authentication system contains an RPC library which
includes an XDR decoder derived from Sun's RPC implementation. The Sun
implementation was recently demonstrated to be vulnerable to a heap
overflow. It is believed that the attacker needs to be able to
authenticate to the kadmin daemon for this attack to be successful. No
exploits are known to currently exist.

All users should upgrade to these errata packages which contain an updated
version of Kerberos 5 which is not vulnerable to this issue.

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.

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2002-0391
http://web.mit.edu/kerberos/www/advisories/MITKRB5-SA-2002-001-xdr.txt