Mailing List Archive

[ GLSA 202012-11 ] c-ares: Denial of service
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory GLSA 202012-11
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
https://security.gentoo.org/
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

Severity: Low
Title: c-ares: Denial of service
Date: December 23, 2020
Bugs: #754939
ID: 202012-11

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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