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Debian: DLA-3047-1 Critical: Avahi Denial of Service Exploit

debian lts
Calendar Grey June 7, 2022
Dist Debian Esm H88
The Debian LTS Advisory DLA-3047-1 resolves vulnerabilities in the avahi package, enabling local entities to execute denial of service attacks.
It was discovered that the Debian package of Avahi, a framework for Multicast DNS Service Discovery, executed the script avahi-daemon-check-dns.sh with root privileges which would ...
Topics%20covered

Topics Covered

security advisory critical issue software update Debian local attack Denial of Service avahi

Summary

Furthermore it was found (CVE-2021-3468) that the event used to signal the
termination of the client connection on the avahi Unix socket is not correctly
handled in the client_work function, allowing a local attacker to trigger an
infinite loop.

For Debian 9 stretch, these problems have been fixed in version
0.6.32-2+deb9u1.

We recommend that you upgrade your avahi packages.

For the detailed security status of avahi please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/avahi

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS


Severity
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-------------------------------------------------------------------------Package: avahi
Version: 0.6.32-2+deb9u1
CVE ID: CVE-2021-3468 CVE-2021-26720
Debian Bug: 984938

Topics%20covered

Topics Covered

security advisory critical issue software update Debian local attack Denial of Service avahi

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