Link Following Affecting avahi package, versions <0.8-4


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

EPSS
0.04% (6th percentile)

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  • Snyk IDSNYK-DEBIAN11-AVAHI-1075018
  • published16 Feb 2021
  • disclosed17 Feb 2021

Introduced: 16 Feb 2021

CVE-2021-26720  (opens in a new tab)
CWE-59  (opens in a new tab)
First added by Snyk

How to fix?

Upgrade Debian:11 avahi to version 0.8-4 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream avahi package and not the avahi package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of service or create arbitrary empty files via a symlink attack on files under /run/avahi-daemon. NOTE: this only affects the packaging for Debian GNU/Linux (used indirectly by SUSE), not the upstream Avahi product.

CVSS Scores

version 3.1