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Gentoo Linux Security Advisory                           GLSA 202101-17
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: Dnsmasq: Multiple vulnerabilities
     Date: January 22, 2021
     Bugs: #766126
       ID: 202101-17

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Synopsis
=======
Multiple vulnerabilities have been found in Dnsmasq, the worst of which
may allow remote attackers to execute arbitrary code.

Background
=========
Dnsmasq is a lightweight and easily-configurable DNS forwarder and DHCP
server.

Affected packages
================
    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-dns/dnsmasq               < 2.83                     >= 2.83

Description
==========
Multiple vulnerabilities have been discovered in Dnsmasq. Please review
the references below for details.

Impact
=====
An attacker, by sending specially crafted DNS replies, could possibly
execute arbitrary code with the privileges of the process, perform a
cache poisoning attack or cause a Denial of Service condition.

Workaround
=========
There is no known workaround at this time.

Resolution
=========
All Dnsmasq users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-dns/dnsmasq-2.83"

References
=========
[ 1 ] CVE-2020-25681
      https://nvd.nist.gov/vuln/detail/CVE-2020-25681
[ 2 ] CVE-2020-25682
      https://nvd.nist.gov/vuln/detail/CVE-2020-25682
[ 3 ] CVE-2020-25683
      https://nvd.nist.gov/vuln/detail/CVE-2020-25683
[ 4 ] CVE-2020-25684
      https://nvd.nist.gov/vuln/detail/CVE-2020-25684
[ 5 ] CVE-2020-25685
      https://nvd.nist.gov/vuln/detail/CVE-2020-25685
[ 6 ] CVE-2020-25686
      https://nvd.nist.gov/vuln/detail/CVE-2020-25686
[ 7 ] CVE-2020-25687
      https://nvd.nist.gov/vuln/detail/CVE-2020-25687

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

 https://security.gentoo.org/glsa/202101-17

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 2021 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/