CVE-2021-26720

HIGH

7.8

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.

CVE Details

CVSS v3.1 Score7.8

SeverityHIGH

CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published2/17/2021

Last Modified11/21/2024

Sourcenvd

Honeypot Sightings0

Affected Products

avahi:avahidebian:debian_linux

Weaknesses (CWE)

CWE-59

References

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796(cve@mitre.org)

https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824(cve@mitre.org)

https://bugzilla.suse.com/show_bug.cgi?id=1180827(cve@mitre.org)

https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html(cve@mitre.org)

https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog(cve@mitre.org)

https://packages.debian.org/bullseye/avahi-daemon(cve@mitre.org)

https://packages.debian.org/buster/avahi-daemon(cve@mitre.org)

https://packages.debian.org/sid/avahi-daemon(cve@mitre.org)

https://security-tracker.debian.org/tracker/CVE-2021-26720(cve@mitre.org)

https://www.openwall.com/lists/oss-security/2021/02/15/2(cve@mitre.org)

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796(af854a3a-2127-422b-91ae-364da2661108)

https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824(af854a3a-2127-422b-91ae-364da2661108)

https://bugzilla.suse.com/show_bug.cgi?id=1180827(af854a3a-2127-422b-91ae-364da2661108)

https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html(af854a3a-2127-422b-91ae-364da2661108)

https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog(af854a3a-2127-422b-91ae-364da2661108)

https://packages.debian.org/bullseye/avahi-daemon(af854a3a-2127-422b-91ae-364da2661108)

https://packages.debian.org/buster/avahi-daemon(af854a3a-2127-422b-91ae-364da2661108)

https://packages.debian.org/sid/avahi-daemon(af854a3a-2127-422b-91ae-364da2661108)

https://security-tracker.debian.org/tracker/CVE-2021-26720(af854a3a-2127-422b-91ae-364da2661108)

https://www.openwall.com/lists/oss-security/2021/02/15/2(af854a3a-2127-422b-91ae-364da2661108)

IOC Correlations

No correlations recorded

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