[gentoo-announce] [ GLSA 200904-10 ] Avahi: Denial of Service

[news 28]

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Gentoo Linux Security Advisory GLSA 200904-10

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http://security.gentoo.org/

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Severity: Normal

Title: Avahi: Denial of Service

Date: April 08, 2009

Bugs: #260971

ID: 200904-10

 

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Synopsis

========

 

An error in Avahi might lead to a Denial of Service via network and CPU

consumption.

 

Background

==========

 

Avahi is a system that facilitates service discovery on a local

network.

 

Affected packages

=================

 

-------------------------------------------------------------------

Package / Vulnerable / Unaffected

-------------------------------------------------------------------

1 net-dns/avahi < 0.6.24-r2 >= 0.6.24-r2

 

Description

===========

 

Rob Leslie reported that the

originates_from_local_legacy_unicast_socket() function in

avahi-core/server.c does not account for the network byte order of a

port number when processing incoming multicast packets, leading to a

multicast packet storm.

 

Impact

======

 

A remote attacker could send specially crafted legacy unicast mDNS

query packets to the Avahi daemon, resulting in a Denial of Service due

to network bandwidth and CPU consumption.

 

Workaround

==========

 

There is no known workaround at this time.

 

Resolution

==========

 

All Avahi users should upgrade to the latest version:

 

# emerge --sync

# emerge --ask --oneshot --verbose ">=net-dns/avahi-0.6.24-r2"

 

References

==========

 

[ 1 ] CVE-2009-0758

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0758

 

Availability

============

 

This GLSA and any updates to it are available for viewing at

the Gentoo Security Website:

 

http://security.gentoo.org/glsa/glsa-200904-10.xml

 

Concerns?

=========

 

Security is a primary focus of Gentoo Linux and ensuring the

confidentiality and security of our users machines is of utmost

importance to us. Any security concerns should be addressed to

security ( -at -) gentoo.org or alternatively, you may file a bug at

http://bugs.gentoo.org.

 

License

=======

 

Copyright 2009 Gentoo Foundation, Inc; referenced text

belongs to its owner(s).

 

The contents of this document are licensed under the

Creative Commons - Attribution / Share Alike license.

 

http://creativecommons.org/licenses/by-sa/2.5