CVE-2023-31130

Publication date 25 May 2023

Last updated 4 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

c-ares is an asynchronous resolver library. ares_inet_net_pton() is vulnerable to a buffer underflow for certain ipv6 addresses, in particular "0::00:00:00/2" was found to cause an issue. C-ares only uses this function internally for configuration purposes which would require an administrator to configure such an address via ares_set_sortlist(). However, users may externally use ares_inet_net_pton() for other purposes and thus be vulnerable to more severe issues. This issue has been fixed in 1.19.1.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
c-ares	23.10 mantic	Not affected
	23.04 lunar	Fixed 1.18.1-2ubuntu0.1
	22.10 kinetic	Fixed 1.18.1-1ubuntu0.22.10.2
	22.04 LTS jammy	Fixed 1.18.1-1ubuntu0.22.04.2
	20.04 LTS focal	Fixed 1.15.0-1ubuntu0.3
	18.04 LTS bionic	Fixed 1.14.0-1ubuntu0.2+esm1
	16.04 LTS xenial	Fixed 1.10.0-3ubuntu0.2+esm2
	14.04 LTS trusty	Ignored end of standard support

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
c-ares	Upstream: f22cc01

Severity score breakdown

Parameter	Value
Base score	6.4 · Medium
Attack vector	Local
Attack complexity	High
Privileges required	High
User interaction	None
Scope	Unchanged
Confidentiality	High
Integrity impact	High
Availability impact	High
Vector	CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H