Updated glibc packages fix vulnerabilities in resolver

Updated glibc packages are available to fix two vulnerabilities in the
resolver functions.

The glibc package contains standard libraries which are used by
multiple programs on the system.

A buffer overflow vulnerability has been found in the way the glibc
resolver handles the resolution of network names and addresses via DNS (as
per Internet RFC 1011). Version 2.2.5 of glibc and earlier versions are
affected. A system would be vulnerable to this issue if the
"networks" database in /etc/nsswitch.conf includes the "dns" entry. By
default, Red Hat Linux ships with "networks" set to "files" and
is therefore not vulnerable to this issue. (CAN-2002-0684)

A second, related, issue is a bug in the glibc-compat packages, which
provide compatibility for applications compiled against glibc version
2.0.x. Applications compiled against this version (such as those
distributed with early Red Hat Linux releases 5.0, 5.1, and 5.2) could also
be vulnerable to this issue. (CAN-2002-0651)

These errata packages for Red Hat Linux 7.1 and 7.2 on the Itanium
architecture also include a fix for the strncpy implementation in some
boundary cases.

All users should upgrade to these errata packages which contain patches to
the glibc and glibc-compat libraries and therefore are not vulnerable to
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-2002-0651.html
https://www.redhat.com/security/data/cve/CVE-2002-0684.html
http://www.cert.org/advisories/CA-2002-19.html

glibc, nsswitch, resolver, strncpy