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[gentoo-announce] [ GLSA 202008-09 ] Shadow: Privilege escalation

Posted on 25 August 2020
Gentoo-announce

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Gentoo Linux Security Advisory GLSA 202008-09
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https://security.gentoo.org/
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Severity: High
Title: Shadow: Privilege escalation
Date: August 25, 2020
Bugs: #702252
ID: 202008-09

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Synopsis
========
Multiple Shadow utilities were installed with setuid permissions,
allowing possible root privilege escalation.

Background
==========
Shadow is a set of tools to deal with user accounts.

Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 sys-apps/shadow < 4.8-r3 >= 4.8-r3

Description
===========
When Shadow was installed with the PAM use flag, setuid binaries
provided by Shadow were not properly restricted.

Impact
======
A local attacker could escalate privileges to root.

Workaround
==========
There is no known workaround at this time.

Resolution
==========
All Shadow users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-apps/shadow-4.8-r3"

References
==========
[ 1 ] CVE-2019-19882
https://nvd.nist.gov/vuln/detail/CVE-2019-19882
[ 2 ] Upstream mitigation
https://github.com/shadow-maint/shadow/pull/199

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

https://security.gentoo.org/glsa/202008-09

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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