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Gentoo Linux Security Advisory                           GLSA 202012-11
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                                            https://security.gentoo.org/
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  Severity: Low
     Title: c-ares: Denial of service
      Date: December 23, 2020
      Bugs: #754939
        ID: 202012-11

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Synopsis
========

A Denial of Service vulnerability was discovered in c-ares.

Background
==========

c-ares is an asynchronous resolver library.

Affected packages
=================

     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  net-dns/c-ares               < 1.17.1                  >= 1.17.1

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"

References
==========

[ 1 ] CVE-2020-8277
       https://nvd.nist.gov/vuln/detail/CVE-2020-8277

Availability
============

This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:

  https://security.gentoo.org/glsa/202012-11

Concerns?
=========

Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users' machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
https://bugs.gentoo.org.

License
=======

Copyright 2020 Gentoo Foundation, Inc; referenced text
belongs to its owner(s).

The contents of this document are licensed under the
Creative Commons - Attribution / Share Alike license.

https://creativecommons.org/licenses/by-sa/2.5