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[gentoo-announce] [ GLSA 202107-11 ] OpenDoas: Insufficient environment filtering

Posted on 07 July 2021
Gentoo-announce

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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
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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