Published: 17/02/2021 Updated: 06/12/2022

CVSS v2 Base Score: 4.6 | Impact Score: 6.4 | Exploitability Score: 3.9

CVSS v3 Base Score: 7.8 | Impact Score: 5.9 | Exploitability Score: 1.8

VMScore: 409

Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P

avahi-daemon-check-dns.sh in the Debian avahi package up to and including 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local malicious user 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.

Vulnerable Product	Search on Vulmon	Subscribe to Product
avahi avahi
debian debian linux 9.0
debian debian linux 10.0

CWE-59 https://packages.debian.org/buster/avahi-daemon https://packages.debian.org/sid/avahi-daemon https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796 https://bugzilla.suse.com/show_bug.cgi?id=1180827 https://security-tracker.debian.org/tracker/CVE-2021-26720 https://packages.debian.org/bullseye/avahi-daemon https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824 https://www.openwall.com/lists/oss-security/2021/02/15/2 https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html https://nvd.nist.gov

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CVE-2021-26720

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