Ubuntu 5008-1: Avahi vulnerabilities | LinuxSecurity.com

Advisories

==========================================================================
Ubuntu Security Notice USN-5008-1
July 07, 2021

avahi vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in Avahi.

Software Description:
- 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 hotnames. 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:

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

Ubuntu 21.04:
  avahi-daemon                    0.8-5ubuntu3.1
  libavahi-core7                  0.8-5ubuntu3.1

Ubuntu 20.10:
  avahi-daemon                    0.8-3ubuntu1.1
  libavahi-core7                  0.8-3ubuntu1.1

Ubuntu 20.04 LTS:
  avahi-daemon                    0.7-4ubuntu7.1
  libavahi-core7                  0.7-4ubuntu7.1

Ubuntu 18.04 LTS:
  avahi-daemon                    0.7-3.1ubuntu1.3
  libavahi-core7                  0.7-3.1ubuntu1.3

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

References:
  https://ubuntu.com/security/notices/USN-5008-1
  CVE-2021-3468, CVE-2021-3502

Package Information:
  https://launchpad.net/ubuntu/+source/avahi/0.8-5ubuntu3.1
  https://launchpad.net/ubuntu/+source/avahi/0.8-3ubuntu1.1
  https://launchpad.net/ubuntu/+source/avahi/0.7-4ubuntu7.1
  https://launchpad.net/ubuntu/+source/avahi/0.7-3.1ubuntu1.3

Ubuntu 5008-1: Avahi vulnerabilities

July 7, 2021

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 21.04 - Ubuntu 20.10 - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS Summary: Several security issues were fixed in Avahi. Software Description: - 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 hotnames. 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

The problem can be corrected by updating your system to the following package versions: Ubuntu 21.04: avahi-daemon 0.8-5ubuntu3.1 libavahi-core7 0.8-5ubuntu3.1 Ubuntu 20.10: avahi-daemon 0.8-3ubuntu1.1 libavahi-core7 0.8-3ubuntu1.1 Ubuntu 20.04 LTS: avahi-daemon 0.7-4ubuntu7.1 libavahi-core7 0.7-4ubuntu7.1 Ubuntu 18.04 LTS: avahi-daemon 0.7-3.1ubuntu1.3 libavahi-core7 0.7-3.1ubuntu1.3 In general, a standard system update will make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-5008-1

CVE-2021-3468, CVE-2021-3502

Severity
Ubuntu Security Notice USN-5008-1

Package Information

https://launchpad.net/ubuntu/+source/avahi/0.8-5ubuntu3.1 https://launchpad.net/ubuntu/+source/avahi/0.8-3ubuntu1.1 https://launchpad.net/ubuntu/+source/avahi/0.7-4ubuntu7.1 https://launchpad.net/ubuntu/+source/avahi/0.7-3.1ubuntu1.3

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