7.8

CVE-2021-26720

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Avahi ≫ Avahi Version <= 0.8-4
Debian ≫ Debian Linux Version9.0
Debian ≫ Debian Linux Version10.0
Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.4% 0.311
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 7.8 1.8 5.9
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvd@nist.gov 4.6 3.9 6.4
AV:L/AC:L/Au:N/C:P/I:P/A:P
CWE-59 Improper Link Resolution Before File Access ('Link Following')

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

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