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

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
c-ares Launchpad, Ubuntu, Debian	trusty	Ignored (end of standard support)
	xenial	Released (1.10.0-3ubuntu0.2+esm2) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	bionic	Released (1.14.0-1ubuntu0.2+esm1) Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
	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)
	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

References

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