glsa-202105-20.xml


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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="202105-20">
  <title>Dnsmasq: DNS cache poisoning</title>
  <synopsis>Use of insufficient randomness in Dnsmasq might lead to DNS Cache
    Poisoning.
  </synopsis>
  <product type="ebuild">dnsmasq</product>
  <announced>2021-05-26</announced>
  <revised count="1">2021-05-26</revised>
  <bug>782130</bug>
  <access>local, remote</access>
  <affected>
    <package name="net-dns/dnsmasq" auto="yes" arch="*">
      <unaffected range="ge">2.85</unaffected>
      <vulnerable range="lt">2.85</vulnerable>
    </package>
  </affected>
  <background>
    <p>Dnsmasq is a lightweight and easily-configurable DNS forwarder and DHCP
      server.
    </p>
  </background>
  <description>
    <p>It was discovered that Dnsmasq, when configured with
      --server=&lt;address&gt;@<interface> or similar (e.g. through dbus),
        configured a fixed UDP port for all outgoing queries to the specified
        upstream DNS server.
      </interface>
    </p>
  </description>
  <impact type="low">
    <p>An attacker, by sending malicious crafted DNS responses, could perform a
      DNS Cache Poisoning attack.
    </p>
  </impact>
  <workaround>
    <p>There is no known workaround at this time.</p>
  </workaround>
  <resolution>
    <p>All Dnsmasq users should upgrade to the latest version:</p>
    
    <code>
      # emerge --sync
      # emerge --ask --oneshot --verbose "&gt;=net-dns/dnsmasq-2.85"
    </code>
    
  </resolution>
  <references>
    <uri link="https://nvd.nist.gov/vuln/detail/CVE-2021-3448">CVE-2021-3448</uri>
  </references>
  <metadata tag="requester" timestamp="2021-05-25T13:34:22Z">whissi</metadata>
  <metadata tag="submitter" timestamp="2021-05-26T08:39:11Z">whissi</metadata>
</glsa>