<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="202101-38">
  <title>NSD: Symbolic link traversal</title>
  <synopsis>A vulnerability was discovered in NSD which could allow a local
    attacker to cause a Denial of Service condition.
  </synopsis>
  <product type="ebuild">nsd</product>
  <announced>2021-01-29</announced>
  <revised count="1">2021-01-29</revised>
  <bug>758977</bug>
  <access>local</access>
  <affected>
    <package name="net-dns/nsd" auto="yes" arch="*">
      <unaffected range="ge">4.3.4</unaffected>
      <vulnerable range="lt">4.3.4</vulnerable>
    </package>
  </affected>
  <background>
    <p>An authoritative only, high performance, open source name server</p>
  </background>
  <description>
    <p>A local vulnerability was discovered that would allow for a local
      symlink attack due to how NSD handles PID files.
    </p>
  </description>
  <impact type="normal">
    <p>A local attacker could cause a Denial of Service condition.</p>
  </impact>
  <workaround>
    <p>There is no known workaround at this time.</p>
  </workaround>
  <resolution>
    <p>All NSD users should upgrade to the latest version:</p>
    
    <code>
      # emerge --sync
      # emerge --ask --oneshot --verbose "&gt;=net-dns/nsd-4.3.4"
    </code>
  </resolution>
  <references>
    <uri link="https://nvd.nist.gov/vuln/detail/CVE-2020-28935">CVE-2020-28935</uri>
    <uri link="https://www.nlnetlabs.nl/downloads/nsd/CVE-2020-28935.txt">
      Upstream advisory
    </uri>
  </references>
  <metadata tag="requester" timestamp="2020-04-22T15:47:22Z">whissi</metadata>
  <metadata tag="submitter" timestamp="2021-01-29T00:05:16Z">b-man</metadata>
</glsa>
