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Gentoo Linux Security Advisory                           GLSA 202101-38
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: NSD: Symbolic link traversal
     Date: January 29, 2021
     Bugs: #758977
       ID: 202101-38

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Synopsis
========

A vulnerability was discovered in NSD which could allow a local
attacker to cause a Denial of Service condition.

Background
==========

An authoritative only, high performance, open source name server

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-dns/nsd                  < 4.3.4                    >= 4.3.4

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

A local vulnerability was discovered that would allow for a local
symlink attack due to how NSD handles PID files.

Impact
======

A local attacker could cause a Denial of Service condition.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All NSD users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-dns/nsd-4.3.4"

References
==========

[ 1 ] CVE-2020-28935
      https://nvd.nist.gov/vuln/detail/CVE-2020-28935
[ 2 ] Upstream advisory
      https://www.nlnetlabs.nl/downloads/nsd/CVE-2020-28935.txt

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

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

 https://security.gentoo.org/glsa/202101-38

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 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