Add GLSA 201801-20

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diff --git a/glsa-201801-20.xml b/glsa-201801-20.xml
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+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE glsa SYSTEM "http://www.gentoo.org/dtd/glsa.dtd">
+<glsa id="201801-20">
+  <title>Fossil: User-assisted execution of arbitrary code</title>
+  <synopsis>A vulnerability has been discovered in Fossil allowing for
+    user-assisted remote execution of arbitrary code.
+  </synopsis>
+  <product type="ebuild">fossil</product>
+  <announced>2018-01-27</announced>
+  <revised count="1">2018-01-27</revised>
+  <bug>640208</bug>
+  <access>remote</access>
+  <affected>
+    <package name="dev-vcs/fossil" auto="yes" arch="*">
+      <unaffected range="ge">2.4</unaffected>
+      <vulnerable range="lt">2.4</vulnerable>
+    </package>
+  </affected>
+  <background>
+    <p>Fossil is a simple, high-reliability, distributed software configuration
+      management system.
+    </p>
+  </background>
+  <description>
+    <p>Fossil does not properly validate SSH sync protocol URLs.</p>
+  </description>
+  <impact type="normal">
+    <p>A remote attacker, by enticing a user to open a specially crafted URL,
+      could possibly execute arbitrary commands with the privileges of the user
+      running the application.
+    </p>
+  </impact>
+  <workaround>
+    <p>There is no known workaround at this time.</p>
+  </workaround>
+  <resolution>
+    <p>All Fossil users should upgrade to the latest version:</p>
+    
+    <code>
+      # emerge --sync
+      # emerge --ask --oneshot --verbose "&gt;=dev-vcs/fossil-2.4"
+    </code>
+  </resolution>
+  <references>
+    <uri link="https://nvd.nist.gov/vuln/detail/CVE-2017-17459">CVE-2017-17459</uri>
+  </references>
+  <metadata tag="requester" timestamp="2018-01-22T21:39:18Z">b-man</metadata>
+  <metadata tag="submitter" timestamp="2018-01-27T17:00:59Z">b-man</metadata>
+</glsa>