7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3 High
AI Score
Confidence
High
4.6 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
0.0004 Low
EPSS
Percentile
5.3%
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.
CPE | Name | Operator | Version |
---|---|---|---|
avahi:avahi | avahi | le | 0.8-4 |
debian:debian_linux | debian debian linux | eq | 9.0 |
debian:debian_linux | debian debian linux | eq | 10.0 |
bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796
bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824
bugzilla.suse.com/show_bug.cgi?id=1180827
lists.debian.org/debian-lts-announce/2022/06/msg00009.html
metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog
packages.debian.org/bullseye/avahi-daemon
packages.debian.org/buster/avahi-daemon
packages.debian.org/sid/avahi-daemon
security-tracker.debian.org/tracker/CVE-2021-26720
www.openwall.com/lists/oss-security/2021/02/15/2
More
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3 High
AI Score
Confidence
High
4.6 Medium
CVSS2
Access Vector
LOCAL
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:L/AC:L/Au:N/C:P/I:P/A:P
0.0004 Low
EPSS
Percentile
5.3%