Gentoo: GLSA-201612-10 Critical: Libvirt Directory Access Risk
gentoo
December 4, 2016
Libvirt is vulnerable to directory traversal when using Access Control Lists (ACL).
Summary
Normally, only privileged users can coerce libvirt into creating or
opening existing files using the virStorageVol APIs; and such usersalready 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.
Topics Covered
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
style>.gentoo_availability{display:block;}
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.
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Severity
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Severity: Normal
Title: libvirt: Directory traversal
Date: December 04, 2016
Bugs: #568870
ID: 201612-10
Topics Covered
Background
libvirt is a C toolkit for manipulating virtual machines.
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Affected Packages
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Package / Vulnerable / Unaffected
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1 app-emulation/libvirt < 1.2.21-r1 >= 1.2.21-r1
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.
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