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NULL Pointer Dereference Affecting avahi package, versions <0.8-5+deb11u1

0.0
medium

Snyk CVSS

    Attack Complexity Low
    Availability High

    Threat Intelligence

    EPSS 0.04% (6th percentile)
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NVD
5.5 medium
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Red Hat
5.5 medium

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  • Snyk ID SNYK-DEBIAN11-AVAHI-1247785
  • published 16 Apr 2021
  • disclosed 7 May 2021
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Introduced: 16 Apr 2021

CVE-2021-3502 Open this link in a new tab
CWE-476 Open this link in a new tab
CWE-617 Open this link in a new tab

How to fix?

Upgrade Debian:11 avahi to version 0.8-5+deb11u1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream avahi package and not the avahi package as distributed by Debian. See How to fix? for Debian:11 relevant fixed versions and status.

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.