GLSA 200904-10: Avahi: Denial of Service
| Severity: | normal |
| Title: | Avahi: Denial of Service |
| Date: | 04/08/2009 |
| Bugs: | |
| ID: | 200904-10 |
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 | Architecture(s) |
|---|---|---|---|
| net-dns/avahi | < 0.6.24-r2 | >= 0.6.24-r2 | All supported architectures |
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
Availability
This GLSA and any updates to it are available for viewing at the Gentoo Security Website:
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.
License
Copyright 2010 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.