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Gentoo Linux Security Advisory                           GLSA 201803-02
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                                           https://security.gentoo.org/
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 Severity: High
    Title: util-linux: User-assisted execution of arbitrary code
     Date: March 07, 2018
     Bugs: #649812
       ID: 201803-02

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Synopsis
========

A vulnerability was discovered in util-linux, which could potentially
lead to the execution of arbitrary code.

Background
==========

util-linux is a suite of Linux programs including mount and umount,
programs used to mount and unmount filesystems.

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

    -------------------------------------------------------------------
     Package              /     Vulnerable     /            Unaffected
    -------------------------------------------------------------------
  1  sys-apps/util-linux        < 2.30.2-r1              >= 2.30.2-r1

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

It was discovered that the umount bash-completion as provided by
util-linux does not escap mount point paths.

Impact
======

An attacker controlling a volume label could entice a user with
privileges to mount/umount filesystems to use umount command with auto
completion, possibly resulting in execution of arbitrary code with root
privileges.

Workaround
==========

Disable Bash-completion or remove
"/usr/share/bash-completion/completions/umount".

Resolution
==========

All util-linux users should upgrade to the latest version:

  # emerge --sync
  # emerge --ask --oneshot --verbose ">=sys-apps/util-linux-2.30.2-r1"

References
==========

[ 1 ] CVE-2018-7738
      https://nvd.nist.gov/vuln/detail/CVE-2018-7738

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

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

 https://security.gentoo.org/glsa/201803-02

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 2018 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