PT-2021-7335 · Avahi+9 · Avahi+9
Pedro Sampaio
·
Published
2021-03-10
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Updated
2026-02-16
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CVE-2021-3468
CVSS v3.1
5.5
Medium
| Vector | AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Name of the Vulnerable Software and Affected Versions
Avahi versions 0.6 up to 0.8
Description
The issue is related to the client work function in the Avahi service discovery system, which can lead to an infinite loop due to a condition with no exit. This can be exploited by an attacker to cause a denial of service. The flaw is in the handling of the event that signals the termination of the client connection on the Avahi Unix socket. When triggered, it allows a local attacker to make the Avahi service unresponsive.
Recommendations
For Avahi versions 0.6 up to 0.8, as a temporary workaround, consider disabling the client work function until a patch is available. Restrict access to the Avahi Unix socket to minimize the risk of exploitation. At the moment, there is no information about a newer version that contains a fix for this vulnerability.
Infinite Loop
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Weakness Enumeration
Related Identifiers
Affected Products
Alt Linux
Almalinux
Astra Linux
Avahi
Centos
Linuxmint
Red Hat
Red Os
Suse
Ubuntu