glsa-201903-02.xml


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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201903-02">
  <title>Zsh: User-assisted execution of arbitrary code</title>
  <synopsis>Input validation errors in Zsh could result in arbitrary code
    execution.
  </synopsis>
  <product type="ebuild">zsh</product>
  <announced>2019-03-10</announced>
  <revised count="1">2019-03-10</revised>
  <bug>665278</bug>
  <access>local, remote</access>
  <affected>
    <package name="app-shells/zsh" auto="yes" arch="*">
      <unaffected range="ge">5.6</unaffected>
      <vulnerable range="lt">5.6</vulnerable>
    </package>
  </affected>
  <background>
    <p>A shell designed for interactive use, although it is also a powerful
      scripting language.
    </p>
  </background>
  <description>
    <p>Two input validation errors have been discovered in how Zsh parses
      scripts:
    </p>
    
    <ul>
      <li>Parsing a malformed shebang line could cause Zsh to call a program
        listed in the second line (CVE-2018-0502)
      </li>
      <li>Shebang lines longer than 64 characters are truncated
        (CVE-2018-13259)
      </li>
    </ul>
  </description>
  <impact type="normal">
    <p>An attacker could entice a user to execute a specially crafted script
      using Zsh, possibly resulting in execution of arbitrary code with the
      privileges of the process.
    </p>
  </impact>
  <workaround>
    <p>There is no known workaround at this time.</p>
  </workaround>
  <resolution>
    <p>All Zsh users should upgrade to the latest version:</p>
    
    <code>
      # emerge --sync
      # emerge --ask --oneshot --verbose "&gt;=app-shells/zsh-5.6"
    </code>
    
  </resolution>
  <references>
    <uri link="https://nvd.nist.gov/vuln/detail/CVE-2018-0502">CVE-2018-0502</uri>
    <uri link="https://nvd.nist.gov/vuln/detail/CVE-2018-13259">CVE-2018-13259</uri>
  </references>
  <metadata tag="requester" timestamp="2018-12-31T07:32:39Z">Zlogene</metadata>
  <metadata tag="submitter" timestamp="2019-03-10T02:21:31Z">ackle</metadata>
</glsa>