CVE-2021-26720

 

Published at: - 17-02-2021 11:15

Last modified: - 07-06-2022 11:15

Total changes: - 4

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.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://packages.debian.org/buster/avahi-daemon
• https://packages.debian.org/sid/avahi-daemon
• https://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelog
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796
• https://bugzilla.suse.com/show_bug.cgi?id=1180827
• https://security-tracker.debian.org/tracker/CVE-2021-26720
• https://packages.debian.org/bullseye/avahi-daemon
• https://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824
• https://www.openwall.com/lists/oss-security/2021/02/15/2
• [debian-lts-announce] 20220607 [SECURITY] [DLA 3047-1] avahi security update-

 

Keywords

NVD

 

CVE-2021-26720

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures