RHSA-2010:0528: Moderate: avahi security update

First published: Tue Jul 13 2010(Updated: )

Avahi is an implementation of the DNS Service Discovery and Multicast DNS<br>specifications for Zero Configuration Networking. It facilitates service<br>discovery on a local network. Avahi and Avahi-aware applications allow you<br>to plug your computer into a network and, with no configuration, view other<br>people to chat with, view printers to print to, and find shared files on<br>other computers.<br>A flaw was found in the way the Avahi daemon (avahi-daemon) processed<br>Multicast DNS (mDNS) packets with corrupted checksums. An attacker on the<br>local network could use this flaw to cause avahi-daemon on a target system<br>to exit unexpectedly via specially-crafted mDNS packets. (CVE-2010-2244)<br>A flaw was found in the way avahi-daemon processed incoming unicast mDNS<br>messages. If the mDNS reflector were enabled on a system, an attacker on<br>the local network could send a specially-crafted unicast mDNS message to<br>that system, resulting in its avahi-daemon flooding the network with a<br>multicast packet storm, and consuming a large amount of CPU. Note: The mDNS<br>reflector is disabled by default. (CVE-2009-0758)<br>All users are advised to upgrade to these updated packages, which contain<br>backported patches to correct these issues. After installing the update,<br>avahi-daemon will be restarted automatically.<br>

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