RHSA-2011:0779: Moderate: avahi security and bug fix update

First published: Thu May 19 2011(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 an empty payload. An attacker on the<br>local network could use this flaw to cause avahi-daemon on a target system<br>to enter an infinite loop via an empty mDNS UDP packet. (CVE-2011-1002)<br>This update also fixes the following bug:<br><li> Previously, the avahi packages in Red Hat Enterprise Linux 6 were not</li> compiled with standard RPM CFLAGS; therefore, the Stack Protector and<br>Fortify Source protections were not enabled, and the debuginfo packages did<br>not contain the information required for debugging. This update corrects<br>this issue by using proper CFLAGS when compiling the packages. (BZ#629954,<br>BZ#684276)<br>All users are advised to upgrade to these updated packages, which contain a<br>backported patch to correct these issues. After installing the update,<br>avahi-daemon will be restarted automatically.<br>

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