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Gentoo Linux Security Advisory 201808-02

Gentoo Linux Security Advisory 201808-02
Posted Aug 22, 2018
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 201808-2 - A vulnerability has been found in LXC which may allow for arbitrary file access (read-only). Versions less than 3.0.1-r1 are affected.

tags | advisory, arbitrary
systems | linux, gentoo
advisories | CVE-2018-6556
MD5 | 508a6a1ce9c1ecac3ddc1b7dac14917a

Gentoo Linux Security Advisory 201808-02

Change Mirror Download
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Gentoo Linux Security Advisory GLSA 201808-02
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https://security.gentoo.org/
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Severity: Low
Title: LinuX Containers user space utilities: Arbitrary file read
Date: August 22, 2018
Bugs: #662780
ID: 201808-02

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Synopsis
========

A vulnerability has been found in LXC which may allow for arbitrary
file access (read-only).

Background
==========

LinuX Containers user space utilities.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-emulation/lxc < 3.0.1-r1 >= 3.0.1-r1

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

lxc-user-nic when asked to delete a network interface will
unconditionally open a user provided path. This code path may be used
by an unprivileged user to check for the existence of a path which they
wouldn't otherwise be able to reach.

Impact
======

A local unprivileged user could use this flaw to access arbitrary
files, including special device files.

Workaround
==========

There is no known workaround at this time.

Resolution
==========

All LXC users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose ">=app-emulation/lxc-3.0.1-r1"

References
==========

[ 1 ] CVE-2018-6556
https://nvd.nist.gov/vuln/detail/CVE-2018-6556

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

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

https://security.gentoo.org/glsa/201808-02

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

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