glsa-200411-22.xml


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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200411-22">
  <title>Davfs2, lvm-user: Insecure tempfile handling</title>
  <synopsis>
    Davfs2 and the lvmcreate_initrd script (included in the lvm-user package)
    are both vulnerable to symlink attacks, potentially allowing a local user
    to overwrite arbitrary files with the rights of the user running them.
  </synopsis>
  <product type="ebuild">davfs2</product>
  <announced>2004-11-11</announced>
  <revised count="01">2004-11-11</revised>
  <bug>68406</bug>
  <bug>69149</bug>
  <access>local</access>
  <affected>
    <package name="net-fs/davfs2" auto="yes" arch="*">
      <unaffected range="ge">0.2.2-r1</unaffected>
      <vulnerable range="lt">0.2.2-r1</vulnerable>
    </package>
    <package name="sys-fs/lvm-user" auto="yes" arch="*">
      <unaffected range="ge">1.0.7-r2</unaffected>
      <vulnerable range="lt">1.0.7-r2</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    Davfs2 is a file system driver that allows you to mount a WebDAV
    server as a local disk drive. lvm-user is a package providing userland
    utilities for LVM (Logical Volume Management) 1.x features.
    </p>
  </background>
  <description>
    <p>
    Florian Schilhabel from the Gentoo Linux Security Audit Team found
    that Davfs2 insecurely created .pid files in /tmp. Furthermore, Trustix
    Secure Linux found that the lvmcreate_initrd script, included in the
    lvm-user Gentoo package, also creates temporary files in
    world-writeable directories with predictable names.
    </p>
  </description>
  <impact type="normal">
    <p>
    A local attacker could create symbolic links in the temporary
    files directory, pointing to a valid file somewhere on the filesystem.
    When Davfs2 or lvmcreate_initrd is called, this would result in the
    file being overwritten with the rights of the user running the
    software, which could be the root user.
    </p>
  </impact>
  <workaround>
    <p>
    There is no known workaround at this time.
    </p>
  </workaround>
  <resolution>
    <p>
    All Davfs2 users should upgrade to the latest version:
    </p>
    <code>
    # emerge --sync
    # emerge --ask --oneshot --verbose "&gt;=net-fs/davfs2-0.2.2-r1"</code>
    <p>
    All lvm-user users should upgrade to the latest version:
    </p>
    <code>
    # emerge --sync
    # emerge --ask --oneshot --verbose "&gt;=sys-fs/lvm-user-1.0.7-r2"</code>
  </resolution>
  <references>
    <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0972">CAN-2004-0972</uri>
  </references>
  <metadata tag="submitter" timestamp="2004-11-10T09:15:59Z">
    koon
  </metadata>
  <metadata tag="bugReady" timestamp="2004-11-11T20:29:52Z">
    jaervosz
  </metadata>
</glsa>