Ubuntu 18.04 LTS: USN-6129-2 critical: avahi denial of service
ubuntu
July 25, 2023
Avahi could be made to crash if it received specially crafted DBus traffic.
Summary
A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS (Available with Ubuntu Pro) - Ubuntu 16.04 LTS (Available with Ubuntu Pro) - Ubuntu 14.04 LTS (Available with Ubuntu Pro) Summary: Avahi could be made to crash if it received specially crafted DBus traffic. Software Description: - avahi: IPv4LL network address configuration daemon Details: USN-6129-1 fixed a vulnerability in Avahi. This update provides the corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Original advisory details: It was discovered that Avahi incorrectly handled certain DBus messages. A local attacker could possibly use this issue to cause Avahi to crash, resulting in a denial of service.
Topics Covered
Update Instructions
The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS (Available with Ubuntu Pro): avahi-daemon 0.7-3.1ubuntu1.3+esm1 Ubuntu 16.04 LTS (Available with Ubuntu Pro): avahi-daemon 0.6.32~rc+dfsg-1ubuntu2.3+esm2 Ubuntu 14.04 LTS (Available with Ubuntu Pro): avahi-daemon 0.6.31-4ubuntu1.3+esm2 In general, a standard system update will make all the necessary changes.
References
https://ubuntu.com/security/notices/USN-6129-2
CVE-2023-1981
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Ubuntu Security Notice USN-6129-2
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