CVE-2021-3468
First published: Wed Mar 10 2021(Updated: )
A flaw was found in avahi deamon. Denial of service can be triggered by writing long lines to /run/avahi-daemon/socket resulting in an unresponsive busy-loop of the daemon. References: <a href="https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=984938">https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=984938</a>
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Avahi Avahi | >=0.6<=0.8 | |
| Debian Debian Linux | =9.0 | |
| debian/avahi | <=0.7-4<=0.8-5 | 0.8-7 0.8-5+deb11u2 |
| debian/avahi | 0.8-5+deb11u2 0.8-10 0.8-13 |
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Reference Links
- https://bugzilla.redhat.com/show_bug.cgi?id=1939614
- https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html
- https://lists.debian.org/debian-lts-announce/2023/06/msg00028.html
- https://github.com/lathiat/avahi/blob/master/avahi-daemon/simple-protocol.c
- https://github.com/lathiat/avahi/pull/330
- https://bugzilla.redhat.com/show_bug.cgi?id=1939614#c3
- https://security-tracker.debian.org/tracker/CVE-2021-3468
- https://github.com/lathiat/avahi/commit/447affe29991ee99c6b9732fc5f2c1048a611d3b
- https://salsa.debian.org/utopia-team/avahi/-/commit/51747c7acbc872b77bf33e10d4fb60596f45269c
- https://bugs.debian.org/984938
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=984938
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=1939615
- https://access.redhat.com/errata/RHSA-2023:6707
- https://access.redhat.com/errata/RHSA-2023:7836
- https://access.redhat.com/errata/RHSA-2024:0418
- https://access.redhat.com/errata/RHSA-2024:0576
Frequently Asked Questions
What is CVE-2021-3468?
CVE-2021-3468 is a vulnerability found in avahi versions 0.6 up to 0.8 where a flaw in how the termination of the client connection on the avahi Unix socket is handled can allow a local attacker to trigger an infinite loop.
What is the severity of CVE-2021-3468?
The severity of CVE-2021-3468 is medium with a CVSS v3 base score of 5.5.
Which software versions of avahi are affected?
Versions 0.6 up to 0.8 of avahi are affected by CVE-2021-3468.
How can a local attacker exploit CVE-2021-3468?
A local attacker can exploit CVE-2021-3468 by triggering an infinite loop through the mishandling of the client connection termination event on the avahi Unix socket.
Are there any fixes or patches available for CVE-2021-3468?
Yes, there are fixes and patches available for CVE-2021-3468. It is recommended to update to a version of avahi that is not affected by this vulnerability.
- collector/nvd-index
- agent/type
- agent/first-publish-date
- collector/debian-bugs
- source/Debian
- alias/CVE-2021-3468
- agent/software-canonical-lookup
- agent/author
- agent/severity
- agent/weakness
- agent/event
- agent/description
- agent/references
- agent/tags
- collector/redhat-bugzilla
- source/Red Hat
- agent/last-modified-date
- collector/security-tracker-debian
- agent/softwarecombine
- collector/mitre-cve
- source/MITRE
- vendor/avahi
- canonical/avahi avahi
- version/avahi avahi/0.6
- version/avahi avahi/0.8
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/9.0
- package-manager/debian