Home / mailings [gentoo-announce] [ GLSA 201701-30 ] vzctl: Security bypass
Posted on 11 January 2017
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From: Aaron Bauman <bman@gentoo.org>
To: gentoo-announce@lists.gentoo.org
Message-ID: <04f6040e-57da-0042-589e-8db525944d31@gentoo.org>
Subject: [ GLSA 201701-30 ] vzctl: Security bypass
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Gentoo Linux Security Advisory GLSA 201701-30
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https://security.gentoo.org/
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Severity: Normal
Title: vzctl: Security bypass
Date: January 11, 2017
Bugs: #560522
ID: 201701-30
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Synopsis
========
A vulnerability in vzctl might allow attackers to gain control over
ploop containers.
Background
==========
vzctl is a set of control tools for the OpenVZ server virtualization
solution.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 sys-cluster/vzctl < 4.9.4 >= 4.9.4
Description
===========
It was discovered that vzctl determined the virtual environment (VE)
layout based on the presence of root.hdd/DiskDescriptor.xml in the VE
private directory. This allows local simfs container (CT) root users
to change the root password for arbitrary ploop containers. This is
demonstrated by a symlink attack on the ploop container root.hdd file
which can then be used to access a control panel.
Impact
======
An attacker with root privileges, in a simfs-based container, could
gain control over ploop-based containers.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All vzctl users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-cluster/vzctl-4.9.4"
References
==========
[ 1 ] CVE-2015-6927
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-6927
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
https://security.gentoo.org/glsa/201701-30
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 2017 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.
http://creativecommons.org/licenses/by-sa/2.5
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<pre style="color: rgb(0, 0, 0); font-style: normal; font-variant-l=igatures: normal; font-variant-caps: normal; font-weight: normal; letter-=spacing: normal; orphans: 2; text-align: start; text-indent: 0px; text-tr=ansform: none; widows: 2; word-spacing: 0px; -webkit-text-stroke-width: 0=px; word-wrap: break-word; white-space: pre-wrap;">- - - - - - - - - - - =- - - - - - - - - - - - - - - - - - - - - - - - -
Gentoo Linux Security Advisory GLSA 201701-30
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<a class="moz-txt-link-freet=ext" href="https://security.gentoo.org/">https://security.gentoo.org/</=a>
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Severity: Normal
Title: vzctl: Security bypass
Date: January 11, 2017
Bugs: #560522
ID: 201701-30
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Synopsis
========
A vulnerability in vzctl might allow attackers to gain control over
ploop containers.
Background
==========
vzctl is a set of control tools for the OpenVZ server virtualization
solution.
Affected packages
=================
-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 sys-cluster/vzctl < 4.9.4 >= 4==2E9.4
Description
===========
It was discovered that vzctl determined the virtual environment (VE)
layout based on the presence of root.hdd/DiskDescriptor.xml in the VE
private directory. This allows local simfs container (CT) root users
to change the root password for arbitrary ploop containers. This is
demonstrated by a symlink attack on the ploop container root.hdd file
which can then be used to access a control panel.
Impact
======
An attacker with root privileges, in a simfs-based container, could
gain control over ploop-based containers.
Workaround
==========
There is no known workaround at this time.
Resolution
==========
All vzctl users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=sys-cluster/vzctl-4.9.4"
References
==========
[ 1 ] CVE-2015-6927
<a class="moz-txt-link-freetext" href="http://nvd.nist.gov/nvd.=cfm?cvename=CVE-2015-6927">http://nvd.nist.gov/nvd.cfm?cvename=CVE-20=15-6927</a>
Availability
============
This GLSA and any updates to it are available for viewing at
the Gentoo Security Website:
<a class="moz-txt-link-freetext" href="https://security.gentoo.org/g=lsa/201701-30">https://security.gentoo.org/glsa/201701-30</a>
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
<a class="moz-txt-link-abbreviated" href="mailto:security@gentoo.org"=>security@gentoo.org</a> or alternatively, you may file a bug at
<a class="moz-txt-link-freetext" href="https://bugs.gentoo.org">https=://bugs.gentoo.org</a>.
License
=======
Copyright 2017 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.
<a class="moz-txt-link-freetext" href="http://creativecommons.org/lic=enses/by-sa/2.5">http://creativecommons.org/licenses/by-sa/2.5</a></pre>
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