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Gentoo Linux Security Advisory                           GLSA 202012-19
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                                            https://security.gentoo.org/
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  Severity: Low
     Title: PowerDNS Recursor: Denial of service
      Date: December 23, 2020
      Bugs: #746923
        ID: 202012-19

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Synopsis
========

A vulnerability in PowerDNS Recursor could lead to a Denial of Service
condition.

Background
==========

PowerDNS Recursor is a high-end, high-performance resolving name
server.

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

     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  net-dns/pdns-recursor        < 4.3.5                    >= 4.3.5

Description
===========

It was discovered that it was possible to update the DNSSEC validation
state to a bogus state for a cached record via DNS ANY query.

Impact
======

A remote attacker could send specially crafted DNS queries to deny
DNSSEC validation.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All PowerDNS Recursor users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=net-dns/pdns-recursor-4.3.5"

References
==========

[ 1 ] CVE-2020-25829
       https://nvd.nist.gov/vuln/detail/CVE-2020-25829
[ 2 ] PowerDNS Security Advisory 2020-07
 
https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2020-07.html

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

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

  https://security.gentoo.org/glsa/202012-19

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
[email protected] 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