GLSA 200611-13: Avahi: "netlink" message vulnerability

http://security.gentoo.org/

Severity:	normal
Title:	Avahi: "netlink" message vulnerability
Date:	11/20/2006
Bugs:	#154322
ID:	200611-13

Synopsis

Avahi fails to verify the origin of netlink messages, which could allow local users to spoof network changes.

Background

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

Affected packages

Package	Vulnerable	Unaffected	Architecture(s)
net-dns/avahi	< 0.6.15	>= 0.6.15	All supported architectures

Description

Avahi does not check that the netlink messages come from the kernel instead of a user-space process.

Impact

A local attacker could exploit this vulnerability by crafting malicious netlink messages and trick Avahi to react to fake network changes. This could lead users to connect to untrusted services without knowing.

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-0.6.15"

References

CVE-2006-5461

Availability

This GLSA and any updates to it are available for viewing at the Gentoo Security Website: http://security.gentoo.org/glsa/glsa-200611-13.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@gentoo.org or alternatively, you may file a bug at https://bugs.gentoo.org.