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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="201603-04">
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<title>FUSE: incorrect filtering of environment variables leading to
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privilege escalation
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</title>
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<synopsis>The fusermount binary in FUSE does not properly clear the
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environment before invoking mount or umount as root that allows a local
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user to overwrite arbitrary files.
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</synopsis>
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<product type="ebuild">fuse</product>
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<announced>2016-03-09</announced>
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<revised count="1">2016-03-09</revised>
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<bug>550152</bug>
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<access>local</access>
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<affected>
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<package name="sys-fs/fuse" auto="yes" arch="*">
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<unaffected range="ge">2.9.4</unaffected>
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<vulnerable range="lt">2.9.4</vulnerable>
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</package>
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</affected>
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<background>
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<p>FUSE provides an interface for filesystems implemented in userspace.</p>
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</background>
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<description>
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<p>The fusermount binary calls setuid(geteuid()) to reset the RUID when it
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invokes /bin/mount so that it can use privileged mount options that are
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normally restricted if RUID != EUID. FUSE does not properly clear
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environment variables before invoking mount or umount as root allowing
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this to be passed to operations using elevated privileges such as
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LIBMOUNT_MTAB that is used by the mount commands debugging feature.
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</p>
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</description>
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<impact type="normal">
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<p>The FUSE vulnerability allows a local, unprivileged user to overwrite
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arbitrary files on the system.
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</p>
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</impact>
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<workaround>
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<p>There is no known work around at this time.</p>
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</workaround>
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<resolution>
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<p>All FUSE 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 ">=sys-fs/fuse-2.9.4"
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</code>
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</resolution>
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<references>
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<uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2015-3202">
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CVE-2015-3202
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</uri>
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</references>
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<metadata tag="requester" timestamp="2015-09-09T05:09:39Z">
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BlueKnight
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</metadata>
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<metadata tag="submitter" timestamp="2016-03-09T17:59:40Z">b-man</metadata>
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</glsa>
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