[ GLSA 202007-21 ] Libreswan: Denial of service

Sam James <[email protected]> Mon, 27 Jul 2020 01:07:18 +0100
Newsgroups	gmane.linux.gentoo.announce
Message-ID	<[email protected]>
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Gentoo Linux Security Advisory                           GLSA 202007-21
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: Libreswan: Denial of service
     Date: July 27, 2020
     Bugs: #722696
       ID: 202007-21

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Synopsis
========

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

Background
==========

Libreswan is a free software implementation of the most widely
supported and standarized VPN protocol based on (“IPsec”) and the
Internet Key Exchange (“IKE”).

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  net-vpn/libreswan             < 3.32                     >= 3.32

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

As a result of a bug in handling certain bogus encrypted IKEv1, while
building a log message that the packet has been dropped, a NULL pointer
dereference causes Libreswan to crash and restart when it attempts to
log the state name involved.

Impact
======

An attacker could cause a possible Denial of Service condition.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Libreswan users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=net-vpn/libreswan-3.32"

References
==========

[ 1 ] CVE-2020-1763
      https://nvd.nist.gov/vuln/detail/CVE-2020-1763

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

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

 https://security.gentoo.org/glsa/202007-21

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
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