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gentooGentoo FoundationGLSA-202012-11
HistoryDec 23, 2020 - 12:00 a.m.

c-ares: Denial of service

2020-12-2300:00:00
Gentoo Foundation
security.gentoo.org
17

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

0.008 Low

EPSS

Percentile

80.7%

Background

c-ares is an asynchronous resolver library.

Description

It was discovered that c-ares incorrectly handled certain DNS requests.

Impact

A remote attacker, able to trigger a DNS request for a host of their choice by an application linked against c-ares, could possibly cause a Denial of Service condition.

Workaround

There is no known workaround at this time.

Resolution

All c-ares users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=net-dns/c-ares-1.17.1"
OSVersionArchitecturePackageVersionFilename
Gentooanyallnet-dns/c-ares< 1.17.1UNKNOWN

7.5 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

5 Medium

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

PARTIAL

AV:N/AC:L/Au:N/C:N/I:N/A:P

0.008 Low

EPSS

Percentile

80.7%