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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">

<glsa id="200511-17">
  <title>FUSE: mtab corruption through fusermount</title>
  <synopsis>
    The fusermount utility from FUSE can be abused to corrupt the /etc/mtab
    file contents, potentially allowing a local attacker to set unauthorized
    mount options.
  </synopsis>
  <product type="ebuild">FUSE</product>
  <announced>November 22, 2005</announced>
  <revised>November 22, 2005: 01</revised>
  <bug>112902</bug>
  <access>local</access>
  <affected>
    <package name="sys-fs/fuse" auto="yes" arch="*">
      <unaffected range="ge">2.4.1-r1</unaffected>
      <vulnerable range="lt">2.4.1-r1</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    FUSE (Filesystem in Userspace) allows implementation of a fully
    functional filesystem in a userspace program. The fusermount utility is
    used to mount/unmount FUSE file systems.
    </p>
  </background>
  <description>
    <p>
    Thomas Biege discovered that fusermount fails to securely handle
    special characters specified in mount points.
    </p>
  </description>
  <impact type="normal">
    <p>
    A local attacker could corrupt the contents of the /etc/mtab file
    by mounting over a maliciously-named directory using fusermount,
    potentially allowing the attacker to set unauthorized mount options.
    This is possible only if fusermount is installed setuid root, which is
    the default in Gentoo.
    </p>
  </impact>
  <workaround>
    <p>
    There is no known workaround at this time.
    </p>
  </workaround>
  <resolution>
    <p>
    All FUSE users should upgrade to the latest version:
    </p>
    <code>
    # emerge --sync
    # emerge --ask --oneshot --verbose &quot;&gt;=sys-fs/fuse-2.4.1-r1&quot;</code>
  </resolution>
  <references>
    <uri link="http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2005-3531">CVE-2005-3531</uri>
  </references>
  <metadata tag="requester" timestamp="Sun, 20 Nov 2005 12:06:35 +0000">
    jaervosz
  </metadata>
  <metadata tag="submitter" timestamp="Mon, 21 Nov 2005 13:30:54 +0000">
    koon
  </metadata>
  <metadata tag="bugReady" timestamp="Tue, 22 Nov 2005 16:07:17 +0000">
    koon
  </metadata>
</glsa>