1. Gentoo Linux Security Advisory
| Advisory Reference | GLSA 200904-10 / avahi |
| Release Date | April 08, 2009 |
| Latest Revision | April 08, 2009: 01 |
| Impact | normal |
| Exploitable | remote |
| Package | Vulnerable versions | Unaffected versions | Architecture(s) |
| net-dns/avahi | < 0.6.24-r2 | >= 0.6.24-r2 | All supported architectures |
Related bugreports: #260971
An error in Avahi might lead to a Denial of Service via network and CPU consumption.
Avahi is a system that facilitates service discovery on a local network.
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.
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.
There is no known workaround at this time.
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-r2" |