[USN-5008-2] Avahi vulnerability
Leonidas S. Barbosa
leo.barbosa at canonical.com
Wed Jul 7 19:35:21 UTC 2021
==========================================================================
Ubuntu Security Notice USN-5008-2
July 07, 2021
avahi vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM
Summary:
Avahi could be made to denial of service if it received a specially crafted input.
Software Description:
- avahi: Avahi IPv4LL network address configuration daemon
Details:
USN-5008-1 fixed a vulnerability in avahi. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.
Original advisory 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.
Update instructions:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 16.04 ESM:
avahi-daemon 0.6.32~rc+dfsg-1ubuntu2.3+esm1
libavahi-core7 0.6.32~rc+dfsg-1ubuntu2.3+esm1
Ubuntu 14.04 ESM:
avahi-daemon 0.6.31-4ubuntu1.3+esm1
libavahi-core7 0.6.31-4ubuntu1.3+esm1
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-5008-2
https://ubuntu.com/security/notices/USN-5008-1
CVE-2021-3468
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