glsa-201701-22.xml


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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
<glsa id="201701-22">
  <title>NGINX: Privilege escalation</title>
  <synopsis>Gentoo's NGINX ebuilds are vulnerable to privilege escalation due
    to the way log files are handled.
  </synopsis>
  <product type="ebuild">nginx</product>
  <announced>2017-01-11</announced>
  <revised count="1">2017-01-11</revised>
  <bug>605008</bug>
  <access>local</access>
  <affected>
    <package name="www-servers/nginx" auto="yes" arch="*">
      <unaffected range="ge">1.10.2-r3</unaffected>
      <vulnerable range="lt">1.10.2-r3</vulnerable>
    </package>
  </affected>
  <background>
    <p>nginx is a robust, small, and high performance HTTP and reverse proxy
      server.
    </p>
  </background>
  <description>
    <p>It was discovered that Gentoo’s default NGINX installation applied
      similar problematic permissions on “/var/log/nginx” as Debian
      (DSA-3701) and is therefore vulnerable to the same attack described in
      CVE-2016-1247.
    </p>
  </description>
  <impact type="normal">
    <p>A local attacker, who either is already NGINX’s system user or belongs
      to NGINX’s group, could potentially escalate privileges.
    </p>
  </impact>
  <workaround>
    <p>Ensure that no untrusted user can create files in directories which are
      used by NGINX (or an NGINX vhost) to store log files.
    </p>
  </workaround>
  <resolution>
    <p>All NGINX users should upgrade to the latest ebuild revision:</p>
    
    <code>
      # emerge --sync
      # emerge --ask --oneshot --verbose "&gt;=www-servers/nginx-1.10.2-r3"
    </code>
  </resolution>
  <references>
    <uri link="https://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-1247">CVE-2016-1247</uri>
    <uri link="https://www.debian.org/security/2016/dsa-3701">DSA-3701</uri>
    <uri link="https://legalhackers.com/advisories/Nginx-Exploit-Deb-Root-PrivEsc-CVE-2016-1247.html">
      Technical analysis
    </uri>
  </references>
  <metadata tag="requester" timestamp="2017-01-10T15:37:19Z">whissi</metadata>
  <metadata tag="submitter" timestamp="2017-01-11T12:18:42Z">whissi</metadata>
</glsa>