<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201706-21">
  <title>nettle: Information disclosure</title>
  <synopsis>A cache-related side channel vulnerability was found in nettle
    which might allow an attacker to obtain sensitive information.
  </synopsis>
  <product type="ebuild">nettle</product>
  <announced>2017-06-22</announced>
  <revised count="1">2017-06-22</revised>
  <bug>590484</bug>
  <access>local, remote</access>
  <affected>
    <package name="dev-libs/nettle" auto="yes" arch="*">
      <unaffected range="ge">3.2-r1</unaffected>
      <vulnerable range="lt">3.2-r1</vulnerable>
    </package>
  </affected>
  <background>
    <p>Nettle is a cryptographic library that is designed to fit easily in
      almost any context: In cryptographic toolkits for object-oriented
      languages, such as C++, Python, or Pike, in applications like lsh or
      GnuPG, or even in kernel space.
    </p>
  </background>
  <description>
    <p>It was found that nettle’s RSA and DSA decryption code was vulnerable
      to cache-related side channel attacks.
    </p>
    
    <p>See the referenced technical paper “Cache Attacks Enable Bulk Key
      Recovery on the Cloud” below for details.
    </p>
  </description>
  <impact type="normal">
    <p>An attacker could recover the private key from a co-located
      virtual-machine instance.
    </p>
  </impact>
  <workaround>
    <p>There is no known workaround at this time.</p>
  </workaround>
  <resolution>
    <p>All nettle users should upgrade to the latest version:</p>
    
    <code>
      # emerge --sync
      # emerge --ask --oneshot --verbose "&gt;=dev-libs/nettle-3.2-r1"
    </code>
    
  </resolution>
  <references>
    <uri link="https://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-6489">CVE-2016-6489</uri>
    <uri link="https://eprint.iacr.org/2016/596.pdf">Cache Attacks Enable Bulk
      Key Recovery on the Cloud
    </uri>
  </references>
  <metadata tag="requester" timestamp="2017-04-19T05:47:07Z">BlueKnight</metadata>
  <metadata tag="submitter" timestamp="2017-06-22T17:24:59Z">whissi</metadata>
</glsa>
