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CVE-2023-32067

Published: 25 May 2023

c-ares is an asynchronous resolver library. c-ares is vulnerable to denial of service. If a target resolver sends a query, the attacker forges a malformed UDP packet with a length of 0 and returns them to the target resolver. The target resolver erroneously interprets the 0 length as a graceful shutdown of the connection. This issue has been patched in version 1.19.1.

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
c-ares
Launchpad, Ubuntu, Debian
bionic
Released (1.14.0-1ubuntu0.2+esm1)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
xenial
Released (1.10.0-3ubuntu0.2+esm2)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
trusty Ignored
(end of standard support)
upstream
Released (1.19.1,1.18.1-3)
focal
Released (1.15.0-1ubuntu0.3)
jammy
Released (1.18.1-1ubuntu0.22.04.2)
kinetic
Released (1.18.1-1ubuntu0.22.10.2)
lunar
Released (1.18.1-2ubuntu0.1)
mantic Not vulnerable
(1.18.1-3)
Patches:
upstream: https://github.com/c-ares/c-ares/commit/b9b8413cfdb70a3f99e1573333b23052d57ec1ae

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H