CVE-2021-26720 | BDVDB-2026-149357 Detail
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.
Impact#
No impact statement in the source data.
Weaknesses#
No weakness recorded in the source data.
References#
- https://packages.debian.org/buster/avahi-daemon
- https://packages.debian.org/sid/avahi-daemon
- https://packages.debian.org/bullseye/avahi-daemon
- https://security-tracker.debian.org/tracker/CVE-2021-26720
- https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824
- https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog
- https://www.openwall.com/lists/oss-security/2021/02/15/2
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796
- https://bugzilla.suse.com/show_bug.cgi?id=1180827
- https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.