glsa-202105-02.xml


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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="202105-02">
  <title>stunnel: Improper certificate validation</title>
  <synopsis>Stunnel was not properly verifying TLS certificates, possibly
    allowing an integrity/confidentiality compromise.
  </synopsis>
  <product type="ebuild">stunnel</product>
  <announced>2021-05-26</announced>
  <revised count="1">2021-05-26</revised>
  <bug>772146</bug>
  <access>local, remote</access>
  <affected>
    <package name="net-misc/stunnel" auto="yes" arch="*">
      <unaffected range="ge">5.58</unaffected>
      <vulnerable range="lt">5.58</vulnerable>
    </package>
  </affected>
  <background>
    <p>The stunnel program is designed to work as an SSL/TLS encryption wrapper
      between a client and a local or remote server.
    </p>
  </background>
  <description>
    <p>It was discovered that stunnel did not correctly verified the client
      certificate when options “redirect” and “verifyChain” are used.
    </p>
  </description>
  <impact type="low">
    <p>A remote attacker could send a specially crafted certificate, possibly
      resulting in a breach of integrity or confidentiality.
    </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-5.58"
    </code>
    
  </resolution>
  <references>
    <uri link="https://nvd.nist.gov/vuln/detail/CVE-2021-20230">CVE-2021-20230</uri>
  </references>
  <metadata tag="requester" timestamp="2021-05-25T22:51:07Z">whissi</metadata>
  <metadata tag="submitter" timestamp="2021-05-26T07:44:01Z">whissi</metadata>
</glsa>