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CVE-2021-3502

Published: 7 May 2021

A flaw was found in avahi 0.8-5. A reachable assertion is present in avahi_s_host_name_resolver_start function allowing a local attacker to crash the avahi service by requesting hostname resolutions through the avahi socket or dbus methods for invalid hostnames. The highest threat from this vulnerability is to the service availability.

Notes

AuthorNote
mdeslaur
introduced in 0.8

Priority

Medium

Cvss 3 Severity Score

5.5

Score breakdown

Status

Package Release Status
avahi
Launchpad, Ubuntu, Debian
bionic Not vulnerable
(code not present)
focal Not vulnerable
(code not present)
groovy
Released (0.8-3ubuntu1.1)
hirsute
Released (0.8-5ubuntu3.1)
impish
Released (0.8-5ubuntu4)
jammy
Released (0.8-5ubuntu4)
trusty Not vulnerable
(code not present)
upstream Needs triage

xenial Not vulnerable
(code not present)
Patches:
upstream: https://github.com/lathiat/avahi/commit/9d31939e55280a733d930b15ac9e4dda4497680c

Severity score breakdown

Parameter Value
Base score 5.5
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H