gentoo-overlay/metadata/glsa/glsa-202012-06.xml

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="202012-06">
  <title>Linux-PAM: Authentication bypass</title>
  <synopsis>A vulnerability has been found in Linux-PAM, allowing attackers to
    bypass the authentication process.
  </synopsis>
  <product type="ebuild">pam</product>
  <announced>2020-12-07</announced>
  <revised count="1">2020-12-07</revised>
  <bug>756361</bug>
  <access>local, remote</access>
  <affected>
    <package name="sys-libs/pam" auto="yes" arch="*">
      <unaffected range="ge">1.5.1</unaffected>
      <vulnerable range="lt">1.5.1</vulnerable>
    </package>
  </affected>
  <background>
    <p>Linux-PAM (Pluggable Authentication Modules) is an architecture allowing
      the separation of the development of privilege granting software from the
      development of secure and appropriate authentication schemes.
    </p>
  </background>
  <description>
    <p>A flaw was found in Linux-Pam in the way it handle empty passwords for
      non-existing users.
    </p>
  </description>
  <impact type="normal">
    <p>A remote attacker, who only needs to know a non-existing username, could
      bypass security restrictions and authenticate as root user.
    </p>
  </impact>
  <workaround>
    <p>Ensure that root account is protected by a non-empty password.</p>
  </workaround>
  <resolution>
    <p>All Linux-PAM users should upgrade to the latest version:</p>
    
    <code>
      # emerge --sync
      # emerge --ask --oneshot --verbose "&gt;=sys-libs/pam-1.5.1"
    </code>
    
  </resolution>
  <references>
    <uri link="https://nvd.nist.gov/vuln/detail/CVE-2020-27780">CVE-2020-27780</uri>
  </references>
  <metadata tag="requester" timestamp="2020-11-26T02:08:08Z">sam_c</metadata>
  <metadata tag="submitter" timestamp="2020-12-07T00:19:35Z">whissi</metadata>
</glsa>