[ GLSA 202107-11 ] OpenDoas: Insufficient environment filtering

Sam James <[email protected]> Wed, 7 Jul 2021 09:02:03 +0100
Newsgroups	gmane.linux.gentoo.announce
Message-ID	<[email protected]>
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Gentoo Linux Security Advisory                           GLSA 202107-11
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                                           https://security.gentoo.org/
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 Severity: Normal
    Title: OpenDoas: Insufficient environment filtering
     Date: July 07, 2021
     Bugs: #767781
       ID: 202107-11

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Synopsis
========

A vulnerability in OpenDoas could lead to privilege escalation.

Background
==========

OpenDoas allows users to run commands as other users.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  app-admin/doas               < 6.8.1                    >= 6.8.1

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

OpenDoas does not properly filter the PATH variable from the resulting
shell after escalating privileges.

Impact
======

A local attacker with control of a user's PATH variable could escalate
privileges if that user uses OpenDoas with a poisoned PATH variable.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All OpenDoas users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=app-admin/doas-6.8.1"

References
==========

[ 1 ] CVE-2019-25016
      https://nvd.nist.gov/vuln/detail/CVE-2019-25016

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

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

 https://security.gentoo.org/glsa/202107-11

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
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