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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 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


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