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CVE-2021-3502

Status Candidate

Overview

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.

Related Files

Ubuntu Security Notice USN-5008-1
Posted Jul 7, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5008-1 - Thomas Kremer discovered that Avahi incorrectly handled termination signals on the Unix socket. A local attacker could possibly use this issue to cause Avahi to hang, resulting in a denial of service. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 20.10. It was discovered that Avahi incorrectly handled certain hostnames. A local attacker could possibly use this issue to cause Avahi to crash, resulting in a denial of service. This issue only affected Ubuntu 20.10 and Ubuntu 21.04. Various other issues were also addressed.

tags | advisory, denial of service, local
systems | linux, unix, ubuntu
advisories | CVE-2021-3468, CVE-2021-3502
SHA-256 | fa0e1e6c77e8b28b0c5d89dca6190efc5b7596e86f1e3bd058c7214eee8549fc
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