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USN-5008-1: Avahi vulnerabilities

7 July 2021

Several security issues were fixed in Avahi.

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Releases

Packages

  • avahi - IPv4LL network address configuration daemon

Details

Thomas Kremer discovered that Avahi incorrectly handled termination signals
on the Unix socket. A local attacker could possibly use this issue to cause
Avahi to hang, resulting in a denial of service. This issue only affected
Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 20.10. (CVE-2021-3468)

It was discovered that Avahi incorrectly handled certain hostnames. A local
attacker could possibly use this issue to cause Avahi to crash, resulting
in a denial of service. This issue only affected Ubuntu 20.10 and Ubuntu
21.04. (CVE-2021-3502)

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

Update instructions

The problem can be corrected by updating your system to the following package versions:

Ubuntu 21.04
Ubuntu 20.10
Ubuntu 20.04
Ubuntu 18.04

In general, a standard system update will make all the necessary changes.

Related notices

  • USN-5008-2: libavahi-compat-libdnssd1, libavahi-glib1, avahi-daemon, libavahi-core7-udeb, libavahi-common-data, libavahi-core7, libavahi-core-dev, libavahi-common3-udeb, libavahi-ui-gtk3-0, libavahi-client3, libavahi-gobject-dev, avahi-autoipd, avahi-dnsconfd, libavahi-ui-gtk3-dev, libavahi-gobject0, libavahi-client-dev, libavahi-common-dev, libavahi-ui0, avahi, libavahi-ui-dev, libavahi-qt4-1, avahi-ui-utils, libavahi-qt4-dev, libavahi-compat-libdnssd-dev, python-avahi, libavahi-glib-dev, avahi-utils, avahi-discover, libavahi-common3