CVE-2021-3468

Publication date 2 June 2021

Last updated 24 July 2024

Ubuntu priority

Cvss 3 Severity Score

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

Show unmaintained releases

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	Fixed 0.6.32~rc+dfsg-1ubuntu2.3+esm1 Ubuntu Pro
	14.04 LTS trusty	Fixed 0.6.31-4ubuntu1.3+esm1 Ubuntu Pro

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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	Other: https://github.com/lathiat/avahi/pull/330

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)

USN-5008-1
Avahi vulnerabilities
7 July 2021

USN-5008-2
Avahi vulnerability
7 July 2021

Other references

https://www.cve.org/CVERecord?id=CVE-2021-3468