Sicherheit: Überschreiben von Dateien in libvirt

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From: Aaron Bauman <bman@gentoo.org>
To: gentoo-announce@lists.gentoo.org
Message-ID: <1aa60829-2e7d-a627-6e45-7d2d5b42566b@gentoo.org>
Subject: [ GLSA 201612-10 ] libvirt: Directory traversal

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Gentoo Linux Security Advisory GLSA 201612-10
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https://security.gentoo.org/
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Severity: Normal
Title: libvirt: Directory traversal
Date: December 04, 2016
Bugs: #568870
ID: 201612-10

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Synopsis
========

Libvirt is vulnerable to directory traversal when using Access Control
Lists (ACL).

Background
==========

libvirt is a C toolkit for manipulating virtual machines.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-emulation/libvirt < 1.2.21-r1 >= 1.2.21-r1

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

Normally, only privileged users can coerce libvirt into creating or
opening existing files using the virStorageVol APIs; and such users
already have full privilege to create any domain XML.

But in the case of fine-grained ACLs, it is feasible that a user can be
granted storage_vol:create but not domain:write, and it violates
assumptions if such a user can abuse libvirt to access files outside of
the storage pool.

Impact
======

When fine-grained Access Control Lists (ACL) are in effect, an
authenticated local user with storage_vol:create permission but without
domain:write permission maybe able to create or access arbitrary files
outside of the storage pool.

Workaround
==========

Don't make use of fine-grained Access Control Lists (ACL) in libvirt;
In Gentoo, libvirt's ACL support is disable by default unless you
enable the "policykit" USE flag.

Resolution
==========

All libvirt users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot -v ">=app-emulation/libvirt-1.2.21-r1"

References
==========

[ 1 ] CVE-2015-5313
http://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-5313

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

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

https://security.gentoo.org/glsa/201612-10

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 2016 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 201612-10
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<a
class=3D"moz-txt-link-freet=
ext" href=3D"https://security.gentoo.org/">https://security.gentoo.org/</=
a>
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Severity: Normal
Title: libvirt: Directory traversal
Date: December 04, 2016
Bugs: #568870
ID: 201612-10

- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

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

Libvirt is vulnerable to directory traversal when using Access Control
Lists (ACL).

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

libvirt is a C toolkit for manipulating virtual machines.

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

-------------------------------------------------------------------
Package / Vulnerable / Unaffected
-------------------------------------------------------------------
1 app-emulation/libvirt < 1.2.21-r1 >=3D
1.2.2=
1-r1=20

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

Normally, only privileged users can coerce libvirt into creating or
opening existing files using the virStorageVol APIs; and such users
already have full privilege to create any domain XML.

But in the case of fine-grained ACLs, it is feasible that a user can be
granted storage_vol:create but not domain:write, and it violates
assumptions if such a user can abuse libvirt to access files outside of
the storage pool.

Impact
=3D=3D=3D=3D=3D=3D

When fine-grained Access Control Lists (ACL) are in effect, an
authenticated local user with storage_vol:create permission but without
domain:write permission maybe able to create or access arbitrary files
outside of the storage pool.

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

Don't make use of fine-grained Access Control Lists (ACL) in libvirt;
In Gentoo, libvirt's ACL support is disable by default unless you
enable the "policykit" USE flag.

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

All libvirt users should upgrade to the latest version:

# emerge --sync
# emerge --ask --oneshot -v
">=3Dapp-emulation/libvirt-1.2.21-r1"

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

[ 1 ] CVE-2015-5313
<a class=3D"moz-txt-link-freetext" href=3D"http://nvd.nist.gov/nvd.=
cfm?cvename=3DCVE-2015-5313">http://nvd.nist.gov/nvd.cfm?cvename=3DCVE-20=
15-5313</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/201612-10">https://security.gentoo.org/glsa/201612-10</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 2016 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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