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Gentoo Linux Security Advisory                           GLSA 202009-12
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: ZeroMQ: Denial of service
     Date: September 13, 2020
     Bugs: #740574
       ID: 202009-12

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Synopsis
========

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

Background
==========

Looks like an embeddable networking library but acts like a concurrency
framework.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-libs/zeromq              < 4.3.3                    >= 4.3.3

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

It was discovered that ZeroMQ does not properly handle connecting peers
before a handshake is completed.

Impact
======

An unauthenticated remote attacker able to connect to a ZeroMQ
endpoint, even with CURVE encryption/authentication enabled, can cause
a Denial of Service condition.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All ZeroMQ users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-libs/zeromq-4.3.3"

References
==========

[ 1 ] CVE-2020-15166
      https://nvd.nist.gov/vuln/detail/CVE-2020-15166

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

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

 https://security.gentoo.org/glsa/202009-12

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


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