avahi security update

CentOS Errata and Security Advisory CESA-2011:0436

Avahi is an implementation of the DNS Service Discovery and Multicast DNS
specifications for Zero Configuration Networking. It facilitates service
discovery on a local network. Avahi and Avahi-aware applications allow you
to plug your computer into a network and, with no configuration, view other
people to chat with, view printers to print to, and find shared files on
other computers.

A flaw was found in the way the Avahi daemon (avahi-daemon) processed
Multicast DNS (mDNS) packets with an empty payload. An attacker on the
local network could use this flaw to cause avahi-daemon on a target system
to enter an infinite loop via an empty mDNS UDP packet. (CVE-2011-1002)

All users are advised to upgrade to these updated packages, which contain
a backported patch to correct this issue. After installing the update,
avahi-daemon will be restarted automatically.

Merged security bulletin from advisories:
https://lists.centos.org/pipermail/centos-announce/2011-April/079455.html
https://lists.centos.org/pipermail/centos-announce/2011-April/079456.html

Affected packages:
avahi
avahi-compat-howl
avahi-compat-howl-devel
avahi-compat-libdns_sd
avahi-compat-libdns_sd-devel
avahi-devel
avahi-glib
avahi-glib-devel
avahi-qt3
avahi-qt3-devel
avahi-tools

Upstream details at:
https://access.redhat.com/errata/RHSA-2011:0436