Sicherheit: Mangelnde Rechteprüfung in vzctl

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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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Gentoo Linux Security Advisory GLSA 201701-30
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<a
class=3D"moz-txt-link-freet=
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a>
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Severity: Normal
Title: vzctl: Security bypass
Date: January 11, 2017
Bugs: #560522
ID: 201701-30

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Synopsis
=3D=3D=3D=3D=3D=3D=3D=3D

A vulnerability in vzctl might allow attackers to gain control over
ploop containers.

Background
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

vzctl is a set of control tools for the OpenVZ server virtualization
solution.

Affected packages
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 sys-cluster/vzctl < 4.9.4 >=3D
4=
=2E9.4=20

Description
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

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
=3D=3D=3D=3D=3D=3D

An attacker with root privileges, in a simfs-based container, could
gain control over ploop-based containers.

Workaround
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

There is no known workaround at this time.

Resolution
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

All vzctl users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot --verbose
">=3Dsys-cluster/vzctl-4.9.4"

References
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

[ 1 ] CVE-2015-6927
<a class=3D"moz-txt-link-freetext" href=3D"http://nvd.nist.gov/nvd.=
cfm?cvename=3DCVE-2015-6927">http://nvd.nist.gov/nvd.cfm?cvename=3DCVE-20=
15-6927</a>

Availability
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D

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

<a class=3D"moz-txt-link-freetext" href=3D"https://security.gentoo.org/g=
lsa/201701-30">https://security.gentoo.org/glsa/201701-30</a>

Concerns?
=3D=3D=3D=3D=3D=3D=3D=3D=3D

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=3D"moz-txt-link-abbreviated"
href=3D"mailto:security@gentoo.org"=
>security@gentoo.org</a> or alternatively, you may file a bug at
<a class=3D"moz-txt-link-freetext" href=3D"https://bugs.gentoo.org">https=
://bugs.gentoo.org</a>.

License
=3D=3D=3D=3D=3D=3D=3D

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=3D"moz-txt-link-freetext" href=3D"http://creativecommons.org/lic=
enses/by-sa/2.5">http://creativecommons.org/licenses/by-sa/2.5</a></pre>
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