Vulnerability CVE-2021-26720
Published: 2021-02-17

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.

Type:

CWE-59

 (Improper Link Resolution Before File Access ('Link Following'))

CVSS2 => (AV:L/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.6/10
6.4/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Debian -> Debian linux 
Avahi -> Avahi 

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