<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd"> <glsa id="201701-28"> <title>c-ares: Heap-based buffer overflow</title> <synopsis>A heap-based buffer overflow in c-ares might allow remote attackers to cause a Denial of Service condition. </synopsis> <product type="ebuild">c-ares</product> <announced>2017-01-11</announced> <revised count="1">2017-01-11</revised> <bug>595536</bug> <access>remote</access> <affected> <package name="net-dns/c-ares" auto="yes" arch="*"> <unaffected range="ge">1.12.0</unaffected> <vulnerable range="lt">1.12.0</vulnerable> </package> </affected> <background> <p>c-ares is a C library for asynchronous DNS requests (including name resolves). </p> </background> <description> <p>A hostname with an escaped trailing dot (such as “hello\.”) would have its size calculated incorrectly leading to a single byte written beyond the end of a buffer on the heap. </p> </description> <impact type="normal"> <p>A remote attacker, able to provide a specially crafted hostname to an application using c-ares, could potentially cause a Denial of Service condition. </p> </impact> <workaround> <p>There is no known workaround at this time.</p> </workaround> <resolution> <p>All c-ares users should upgrade to the latest version:</p> <code> # emerge --sync # emerge --ask --oneshot --verbose ">=net-dns/c-ares-1.12.0" </code> </resolution> <references> <uri link="https://nvd.nist.gov/nvd.cfm?cvename=CVE-2016-5180">CVE-2016-5180</uri> </references> <metadata tag="requester" timestamp="2017-01-09T14:14:23Z">whissi</metadata> <metadata tag="submitter" timestamp="2017-01-11T12:29:54Z">whissi</metadata> </glsa>