Headline
Ubuntu Security Notice USN-6129-2
Ubuntu Security Notice 6129-2 - 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. 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.
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Ubuntu Security Notice USN-6129-2
July 25, 2023
avahi vulnerability
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.
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
https://ubuntu.com/security/notices/USN-6129-1
CVE-2023-1981
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Ubuntu Security Notice 6129-1 - 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.
A vulnerability was found in the avahi library. This flaw allows an unprivileged user to make a dbus call, causing the avahi daemon to crash.