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7.8
CVSSv3

CVE-2021-26720

Published: 17/02/2021 Updated: 06/12/2022
CVSS v2 Base Score: 4.6 | Impact Score: 6.4 | Exploitability Score: 3.9
CVSS v3 Base Score: 7.8 | Impact Score: 5.9 | Exploitability Score: 1.8
VMScore: 409
Vector: AV:L/AC:L/Au:N/C:P/I:P/A:P

Vulnerability Summary

avahi-daemon-check-dns.sh in the Debian avahi package up to and including 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local malicious user 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.

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Mailing Lists

Full Disclosure: CVE-2021-26720: avahi-daemon: 'avahi' to 'root' user privilege escalation through Debian specific if-up script avahi-daemon-check-dns.sh
Hello list, the avahi-daemon package [1] in Debian Linux contains a Debian specific script installed in /usr/lib/avahi/avahi-daemon-check-dnssh This script is run as 'root' via the if-upd script in /etc/network/if-upd/avahi-daemon There are security issues in the code of the main shell script in this context The $RUNDIR "/run/avahi ...

References

CWE-59https://packages.debian.org/buster/avahi-daemonhttps://packages.debian.org/sid/avahi-daemonhttps://metadata.ftp-master.debian.org/changelogs/main/a/avahi/avahi_0.8-4_changeloghttps://bugs.debian.org/cgi-bin/bugreport.cgi?bug=982796https://bugzilla.suse.com/show_bug.cgi?id=1180827https://security-tracker.debian.org/tracker/CVE-2021-26720https://packages.debian.org/bullseye/avahi-daemonhttps://bugs.launchpad.net/ubuntu/+source/avahi/+bug/1870824https://www.openwall.com/lists/oss-security/2021/02/15/2https://lists.debian.org/debian-lts-announce/2022/06/msg00009.htmlhttps://nvd.nist.govhttp://seclists.org/oss-sec/2021/q1/142
CVSSv3
CVSSv2
CVSSv3
VMScore
Recommendations:
CVE-2024-0044client sideCVE-2021-47601deserializationCVE-2024-34994encryptionCVE-2021-47609CVE-2024-37079CVE-2024-38608
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