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AUSCERT External Security Bulletin Redistribution
ESB-2021.2330
USN-5008-1 and USN-5008-2: Avahi vulnerabilities
8 July 2021
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AusCERT Security Bulletin Summary
---------------------------------
Product: Avahi
Publisher: Ubuntu
Operating System: Ubuntu
Impact/Access: Denial of Service -- Existing Account
Resolution: Patch/Upgrade
CVE Names: CVE-2021-3502 CVE-2021-3468
Reference: ESB-2021.1956
ESB-2021.1546
Original Bulletin:
https://ubuntu.com/security/notices/USN-5008-1
https://ubuntu.com/security/notices/USN-5008-2
Comment: This bulletin contains two (2) Ubuntu security advisories.
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USN-5008-1: Avahi vulnerabilities
07 July 2021
Several security issues were fixed in Avahi.
Releases
o Ubuntu 21.04
o Ubuntu 20.10
o Ubuntu 20.04 LTS
o Ubuntu 18.04 LTS
Packages
o 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
o libavahi-core7 - 0.8-5ubuntu3.1
o avahi-daemon - 0.8-5ubuntu3.1
Ubuntu 20.10
o libavahi-core7 - 0.8-3ubuntu1.1
o avahi-daemon - 0.8-3ubuntu1.1
Ubuntu 20.04
o libavahi-core7 - 0.7-4ubuntu7.1
o avahi-daemon - 0.7-4ubuntu7.1
Ubuntu 18.04
o libavahi-core7 - 0.7-3.1ubuntu1.3
o avahi-daemon - 0.7-3.1ubuntu1.3
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-3468
o CVE-2021-3502
Related notices
o USN-5008-2 : libavahi-core7, libavahi-common3-udeb,
libavahi-compat-libdnssd1, libavahi-common-dev, libavahi-glib-dev,
libavahi-client3, avahi-ui-utils, libavahi-ui-gtk3-0, libavahi-ui-gtk3-dev,
libavahi-core-dev, libavahi-ui-dev, avahi-utils, libavahi-ui0,
libavahi-compat-libdnssd-dev, libavahi-gobject0, libavahi-core7-udeb,
libavahi-common3, libavahi-gobject-dev, libavahi-client-dev, avahi-autoipd,
avahi-discover, avahi, python-avahi, libavahi-glib1, libavahi-common-data,
libavahi-qt4-1, avahi-daemon, avahi-dnsconfd, libavahi-qt4-dev
- -------------------------------------------------------------------------------
USN-5008-2: Avahi vulnerability
07 July 2021
Avahi could be made to denial of service if it received a specially crafted input.
Releases
o Ubuntu 16.04 ESM
o Ubuntu 14.04 ESM
Packages
o 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
o libavahi-core7 - 0.6.32~rc+dfsg-1ubuntu2.3+esm1
Available with UA Infra or UA Desktop
o avahi-daemon - 0.6.32~rc+dfsg-1ubuntu2.3+esm1
Available with UA Infra or UA Desktop
Ubuntu 14.04
o libavahi-core7 - 0.6.31-4ubuntu1.3+esm1
Available with UA Infra or UA Desktop
o avahi-daemon - 0.6.31-4ubuntu1.3+esm1
Available with UA Infra or UA Desktop
In general, a standard system update will make all the necessary changes.
References
o CVE-2021-3468
Related notices
o USN-5008-1 : libavahi-common3-udeb, libavahi-compat-libdnssd-dev,
libavahi-common-data, avahi, gir1.2-avahi-0.6, libavahi-ui-gtk3-0,
libavahi-core7, libavahi-common-dev, avahi-daemon, libavahi-gobject-dev,
libavahi-core-dev, avahi-discover, avahi-utils, avahi-dnsconfd,
libavahi-common3, libavahi-glib1, libavahi-glib-dev, libavahi-ui-gtk3-dev,
libavahi-core7-udeb, libavahi-client3, avahi-autoipd, python3-avahi,
libavahi-client-dev, avahi-ui-utils, libavahi-compat-libdnssd1,
python-avahi, libavahi-gobject0
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