<?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd"> <glsa id="202101-38"> <title>NSD: Symbolic link traversal</title> <synopsis>A vulnerability was discovered in NSD which could allow a local attacker to cause a Denial of Service condition. </synopsis> <product type="ebuild">nsd</product> <announced>2021-01-29</announced> <revised count="1">2021-01-29</revised> <bug>758977</bug> <access>local</access> <affected> <package name="net-dns/nsd" auto="yes" arch="*"> <unaffected range="ge">4.3.4</unaffected> <vulnerable range="lt">4.3.4</vulnerable> </package> </affected> <background> <p>An authoritative only, high performance, open source name server</p> </background> <description> <p>A local vulnerability was discovered that would allow for a local symlink attack due to how NSD handles PID files. </p> </description> <impact type="normal"> <p>A local attacker could cause a Denial of Service condition.</p> </impact> <workaround> <p>There is no known workaround at this time.</p> </workaround> <resolution> <p>All NSD users should upgrade to the latest version:</p> <code> # emerge --sync # emerge --ask --oneshot --verbose ">=net-dns/nsd-4.3.4" </code> </resolution> <references> <uri link="https://nvd.nist.gov/vuln/detail/CVE-2020-28935">CVE-2020-28935</uri> <uri link="https://www.nlnetlabs.nl/downloads/nsd/CVE-2020-28935.txt"> Upstream advisory </uri> </references> <metadata tag="requester" timestamp="2020-04-22T15:47:22Z">whissi</metadata> <metadata tag="submitter" timestamp="2021-01-29T00:05:16Z">b-man</metadata> </glsa>