Unrated severityNVD Advisory· Published Feb 17, 2021· Updated Aug 3, 2024
CVE-2021-26720
CVE-2021-26720
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
34- osv-coords33 versionspkg:apk/chainguard/avahipkg:apk/chainguard/avahi-devpkg:apk/chainguard/avahi-docpkg:apk/wolfi/avahipkg:apk/wolfi/avahi-devpkg:apk/wolfi/avahi-docpkg:rpm/opensuse/avahi&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/avahi&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/avahi&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/avahi-glib2&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/avahi-glib2&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/avahi-mono&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/avahi-qt4&distro=openSUSE%20Leap%2015.2pkg:rpm/suse/avahi&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/avahi&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/avahi&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2pkg:rpm/suse/avahi&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP2pkg:rpm/suse/avahi&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Package%20Hub%2015%20SP2pkg:rpm/suse/avahi&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/avahi&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg:rpm/suse/avahi&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/avahi&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/avahi&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/avahi-glib2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/avahi-glib2&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/avahi-glib2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Basesystem%2015%20SP2pkg:rpm/suse/avahi-glib2&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP2pkg:rpm/suse/avahi-glib2&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/avahi-glib2&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg:rpm/suse/avahi-glib2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/avahi-glib2&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/avahi-glib2&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/avahi-glib2&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2012%20SP5
< 0+ 32 more
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0
- (no CPE)range: < 0.7-lp152.3.6.1
- (no CPE)range: < 0.6.32-5.13.1
- (no CPE)range: < 0.8-7.2
- (no CPE)range: < 0.7-lp152.3.6.1
- (no CPE)range: < 0.6.32-5.13.1
- (no CPE)range: < 0.7-lp152.3.6.1
- (no CPE)range: < 0.7-lp152.3.6.1
- (no CPE)range: < 0.6.32-5.13.1
- (no CPE)range: < 0.6.32-5.13.1
- (no CPE)range: < 0.7-3.6.1
- (no CPE)range: < 0.7-3.6.1
- (no CPE)range: < 0.7-3.6.1
- (no CPE)range: < 0.6.32-32.12.2
- (no CPE)range: < 0.6.32-5.13.1
- (no CPE)range: < 0.6.32-32.12.2
- (no CPE)range: < 0.6.32-5.13.1
- (no CPE)range: < 0.6.32-32.12.2
- (no CPE)range: < 0.6.32-5.13.1
- (no CPE)range: < 0.6.32-5.13.1
- (no CPE)range: < 0.7-3.6.1
- (no CPE)range: < 0.7-3.6.1
- (no CPE)range: < 0.6.32-32.12.3
- (no CPE)range: < 0.6.32-5.13.1
- (no CPE)range: < 0.6.32-32.12.3
- (no CPE)range: < 0.6.32-5.13.1
- (no CPE)range: < 0.6.32-32.12.3
- (no CPE)range: < 0.6.32-32.12.3
Patches
Vulnerability mechanics
References
10- bugs.debian.org/cgi-bin/bugreport.cgimitrex_refsource_MISC
- bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824mitrex_refsource_MISC
- bugzilla.suse.com/show_bug.cgimitrex_refsource_MISC
- lists.debian.org/debian-lts-announce/2022/06/msg00009.htmlmitremailing-listx_refsource_MLIST
- metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changelogmitrex_refsource_MISC
- packages.debian.org/bullseye/avahi-daemonmitrex_refsource_MISC
- packages.debian.org/buster/avahi-daemonmitrex_refsource_MISC
- packages.debian.org/sid/avahi-daemonmitrex_refsource_MISC
- security-tracker.debian.org/tracker/CVE-2021-26720mitrex_refsource_MISC
- www.openwall.com/lists/oss-security/2021/02/15/2mitrex_refsource_MISC
News mentions
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