glsa-200808-08.xml


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<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="200808-08">
  <title>stunnel: Security bypass</title>
  <synopsis>
    stunnel does not properly prevent the authentication of a revoked
    certificate which would be published by OCSP.
  </synopsis>
  <product type="ebuild">stunnel</product>
  <announced>2008-08-08</announced>
  <revised count="02">2009-08-09</revised>
  <bug>222805</bug>
  <access>remote</access>
  <affected>
    <package name="net-misc/stunnel" auto="yes" arch="*">
      <unaffected range="ge">4.24</unaffected>
      <unaffected range="lt">4</unaffected>
      <vulnerable range="lt">4.24</vulnerable>
    </package>
  </affected>
  <background>
    <p>
    The stunnel program is designed to work as an SSL encryption wrapper
    between a remote client and a local or remote server. OCSP (Online
    Certificate Status Protocol), as described in RFC 2560, is an internet
    protocol used for obtaining the revocation status of an X.509 digital
    certificate.
    </p>
  </background>
  <description>
    <p>
    An unspecified bug in the OCSP search functionality of stunnel has been
    discovered.
    </p>
  </description>
  <impact type="low">
    <p>
    A remote attacker can use a revoked certificate that would be
    successfully authenticated by stunnel. This issue only concerns the
    users who have enabled the OCSP validation in stunnel.
    </p>
  </impact>
  <workaround>
    <p>
    There is no known workaround at this time.
    </p>
  </workaround>
  <resolution>
    <p>
    All stunnel users should upgrade to the latest version:
    </p>
    <code>
    # emerge --sync
    # emerge --ask --oneshot --verbose "&gt;=net-misc/stunnel-4.24"</code>
  </resolution>
  <references>
    <uri link="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2420">CVE-2008-2420</uri>
  </references>
  <metadata tag="requester" timestamp="2008-08-03T21:53:49Z">
    rbu
  </metadata>
  <metadata tag="submitter" timestamp="2008-08-05T21:07:35Z">
    falco
  </metadata>
  <metadata tag="bugReady" timestamp="2008-08-05T21:08:30Z">
    falco
  </metadata>
</glsa>