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)
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)
Update instructions
In general, a standard system update will make all the necessary changes.
Learn more about how to get the fixes.The problem can be corrected by updating your system to the following package versions:
| Ubuntu Release | Package Version | ||
|---|---|---|---|
| 21.04 hirsute | libavahi-core7 – 0.8-5ubuntu3.1 | ||
| avahi-daemon – 0.8-5ubuntu3.1 | |||
| 20.10 groovy | libavahi-core7 – 0.8-3ubuntu1.1 | ||
| avahi-daemon – 0.8-3ubuntu1.1 | |||
| 20.04 focal | libavahi-core7 – 0.7-4ubuntu7.1 | ||
| avahi-daemon – 0.7-4ubuntu7.1 | |||
| 18.04 bionic | libavahi-core7 – 0.7-3.1ubuntu1.3 | ||
| avahi-daemon – 0.7-3.1ubuntu1.3 | |||
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.