Avahi: Denial of Service

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200901-11 / avahi
Release Date	January 14, 2009
Latest Revision	January 14, 2009: 01
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-dns/avahi	< 0.6.24	>= 0.6.24	All supported architectures

Related bugreports: #250913

Synopsis

A Denial of Service vulnerability has been discovered in Avahi.

2. Impact Information

Background

Avahi is a system that facilitates service discovery on a local network.

Description

Hugo Dias reported a failed assertion in the originates_from_local_legacy_unicast_socket() function in avahi-core/server.c when processing mDNS packets with a source port of 0.

Impact

A remote attacker could send specially crafted packets to the daemon, leading to its crash.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All Avahi users should upgrade to the latest version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-dns/avahi-0.6.24"

4. References

CVE-2008-5081

Page updated January 14, 2009

Summary: This is a Gentoo Linux Security Advisory

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