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