glsa-201701-30.xml


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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201701-30">
  <title>vzctl: Security bypass</title>
  <synopsis>A vulnerability in vzctl might allow attackers to gain control over
    ploop containers.
  </synopsis>
  <product type="ebuild">vzctl</product>
  <announced>2017-01-11</announced>
  <revised count="1">2017-01-11</revised>
  <bug>560522</bug>
  <access>local, remote</access>
  <affected>
    <package name="sys-cluster/vzctl" auto="yes" arch="*">
      <unaffected range="ge">4.9.4</unaffected>
      <vulnerable range="lt">4.9.4</vulnerable>
    </package>
  </affected>
  <background>
    <p>vzctl is a set of control tools for the OpenVZ server virtualization
      solution.
    </p>
  </background>
  <description>
    <p>It was discovered that vzctl determined the virtual environment (VE)
      layout based on the presence of root.hdd/DiskDescriptor.xml in the VE
      private directory.  This allows local simfs container (CT) root users to
      change the root password for arbitrary ploop containers.  This is
      demonstrated by a symlink attack on the ploop container root.hdd file
      which can then be used to access a control panel.
    </p>
  </description>
  <impact type="normal">
    <p>An attacker with root privileges, in a simfs-based container, could gain
      control over ploop-based containers.
    </p>
  </impact>
  <workaround>
    <p>There is no known workaround at this time.</p>
  </workaround>
  <resolution>
    <p>All vzctl users should upgrade to the latest version:</p>
    
    <code>
      # emerge --sync
      # emerge --ask --oneshot --verbose "&gt;=sys-cluster/vzctl-4.9.4"
    </code>
  </resolution>
  <references>
    <uri link="https://nvd.nist.gov/nvd.cfm?cvename=CVE-2015-6927">CVE-2015-6927</uri>
  </references>
  <metadata tag="requester" timestamp="2017-01-10T16:32:14Z">whissi</metadata>
  <metadata tag="submitter" timestamp="2017-01-11T12:39:20Z">whissi</metadata>
</glsa>