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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
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<glsa id="201612-10">
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<title>libvirt: Directory traversal</title>
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<synopsis>Libvirt is vulnerable to directory traversal when using Access
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Control Lists (ACL).
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</synopsis>
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<product type="ebuild">libvirt</product>
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<announced>2016-12-04</announced>
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<revised count="1">2016-12-04</revised>
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<bug>568870</bug>
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<access>local</access>
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<affected>
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<package name="app-emulation/libvirt" auto="yes" arch="*">
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<unaffected range="ge">1.2.21-r1</unaffected>
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<vulnerable range="lt">1.2.21-r1</vulnerable>
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</package>
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</affected>
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<background>
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<p>libvirt is a C toolkit for manipulating virtual machines.</p>
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</background>
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<description>
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<p>Normally, only privileged users can coerce libvirt into creating or
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opening existing files using the virStorageVol APIs; and such users
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already have full privilege to create any domain XML.
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</p>
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<p>But in the case of fine-grained ACLs, it is feasible that a user can be
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granted storage_vol:create but not domain:write, and it violates
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assumptions if such a user can abuse libvirt to access files outside of
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the storage pool.
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</p>
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</description>
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<impact type="normal">
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<p>When fine-grained Access Control Lists (ACL) are in effect, an
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authenticated local user with storage_vol:create permission but without
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domain:write permission maybe able to create or access arbitrary files
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outside of the storage pool.
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</p>
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</impact>
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<workaround>
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<p>Don’t make use of fine-grained Access Control Lists (ACL) in libvirt;
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In Gentoo, libvirt’s ACL support is disable by default unless you
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enable the “policykit” USE flag.
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</p>
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</workaround>
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<resolution>
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<p>All libvirt users should upgrade to the latest version:</p>
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<code>
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# emerge --sync
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# emerge --ask --oneshot --verbose ">=app-emulation/libvirt-1.2.21-r1"
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</code>
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</resolution>
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<references>
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<uri link="https://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-5313">CVE-2015-5313</uri>
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</references>
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<metadata tag="requester" timestamp="2015-12-24T05:15:17Z">
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BlueKnight
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</metadata>
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<metadata tag="submitter" timestamp="2016-12-04T11:17:48Z">whissi</metadata>
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</glsa>
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