Home / mailings [gentoo-announce] [ GLSA 201612-10 ] libvirt: Directory traversal
Posted on 04 December 2016
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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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<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 201612-10
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
<a class="moz-txt-link-freet=ext" href="https://security.gentoo.org/">https://security.gentoo.org/</=a>
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Severity: Normal
Title: libvirt: Directory traversal
Date: December 04, 2016
Bugs: #568870
ID: 201612-10
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
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 >= 1.2.2=1-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
<a class="moz-txt-link-freetext" href="http://nvd.nist.gov/nvd.=cfm?cvename=CVE-2015-5313">http://nvd.nist.gov/nvd.cfm?cvename=CVE-20=15-5313</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/201612-10">https://security.gentoo.org/glsa/201612-10</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 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="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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