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CVE-2021-3468

Publication date 2 June 2021

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

5.5 · Medium

Score breakdown

A flaw was found in avahi in versions 0.6 up to 0.8. The event used to signal the termination of the client connection on the avahi Unix socket is not correctly handled in the client_work function, allowing a local attacker to trigger an infinite loop. The highest threat from this vulnerability is to the availability of the avahi service, which becomes unresponsive after this flaw is triggered.

Read the notes from the security team

Status

Package Ubuntu Release Status
avahi 22.04 LTS jammy
Fixed 0.8-5ubuntu3
21.10 impish
Fixed 0.8-5ubuntu3
21.04 hirsute
Fixed 0.8-5ubuntu3
20.10 groovy
Fixed 0.8-3ubuntu1.1
20.04 LTS focal
Fixed 0.7-4ubuntu7.1
18.04 LTS bionic
Fixed 0.7-3.1ubuntu1.3
16.04 LTS xenial
14.04 LTS trusty

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Notes

mdeslaur

as of 2021-07-06, the proposed patch has not been commited upstream

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
avahi

Severity score breakdown

Parameter Value
Base score 5.5 · Medium
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

References

Related Ubuntu Security Notices (USN)

Other references