[ GLSA 202008-09 ] Shadow: Privilege escalation

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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
[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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