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TITLE:
Avahi Legacy Unicast Queries Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA34083

VERIFY ADVISORY:
http://secunia.com/advisories/34083/

DESCRIPTION:
A vulnerability has been reported in Avahi, which can be exploited by
malicious people to potentially cause a DoS (Denial of Service). 

The vulnerability is caused due to the
"originates_from_local_legacy_unicast_socket()" function in
avahi-core/server.c failing to properly detected locally reflected
packets. This can be exploited to trigger the excessive consumption
of resources and potentially cause a crash or hang via specially
crafted legacy unicast queries.

The vulnerability is reported in version 0.6.23. Other versions may
also be affected.

SOLUTION:
Disable the reflector functionality or use Avahi in trusted networks
only.

PROVIDED AND/OR DISCOVERED BY:
Reported by Rob Leslie via a Debian bug report.

ORIGINAL ADVISORY:
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=517683

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