Description
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.
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Resourcehttps://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824https://bugzilla.suse.com/show_bug.cgi?id=1180827https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changeloghttps://packages.debian.org/bullseye/avahi-daemonhttps://packages.debian.org/buster/avahi-daemonhttps://packages.debian.org/sid/avahi-daemonhttps://security-tracker.debian.org/tracker/CVE-2021-26720https://www.openwall.com/lists/oss-security/2021/02/15/2
