[ GLSA 202105-34 ] Bash: Privilege escalation

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Gentoo Linux Security Advisory                           GLSA 202105-34
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                                            https://security.gentoo.org/
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  Severity: Normal
     Title: Bash: Privilege escalation
      Date: May 26, 2021
      Bugs: #702488
        ID: 202105-34

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Synopsis
========

A vulnerability in Bash may allow users to escalate privileges.

Background
==========

Bash is the standard GNU Bourne Again SHell.

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

     -------------------------------------------------------------------
      Package              /     Vulnerable     /            Unaffected
     -------------------------------------------------------------------
   1  app-shells/bash            < 5.0_p11-r1            >= 5.0_p11-r1

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

It was discovered that Bash incorrectly dropped privileges by setting
its effective UID to its real UID.

Impact
======

A local attacker could possibly escalate privileges.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All Bash users should upgrade to the latest version:

   # emerge --sync
   # emerge --ask --oneshot --verbose ">=app-shells/bash-5.0_p11-r1"

References
==========

[ 1 ] CVE-2019-18276
       https://nvd.nist.gov/vuln/detail/CVE-2019-18276

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

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

  https://security.gentoo.org/glsa/202105-34

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