CVE-2023-31130

Published: 25 May 2023

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.

Priority

Cvss 3 Severity Score

6.4

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/f22cc01039b6473b736d3bf438f56a2654cdf2b2

Severity score breakdown

Parameter	Value
Base score	6.4
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

References

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