svn commit: r340998 - head/security/vuxml

Sat Jan 25 09:24:38 UTC 2014

Author: koobs
Date: Sat Jan 25 09:24:38 2014
New Revision: 340998
URL: http://svnweb.freebsd.org/changeset/ports/340998
QAT: https://qat.redports.org/buildarchive/r340998/

Log:
  Document Varnish HTTP Cache < 3.0.5 DoS Vulnerability
  
  Reviewed by:	remko

Modified:
  head/security/vuxml/vuln.xml

Modified: head/security/vuxml/vuln.xml
==============================================================================

--- head/security/vuxml/vuln.xml	Sat Jan 25 09:15:12 2014	(r340997)
+++ head/security/vuxml/vuln.xml	Sat Jan 25 09:24:38 2014	(r340998)
@@ -51,6 +51,52 @@ Note:  Please add new entries to the beg
 
 -->
 <vuxml xmlns="http://www.vuxml.org/apps/vuxml-1">
+  <vuln vid="d9dbe6e8-84da-11e3-98bd-080027f2d077">
+    <topic>varnish -- DoS vulnerability in Varnish HTTP cache</topic>
+    <affects>
+      <package>
+	<name>varnish</name>
+	<range><lt>3.0.5</lt></range>
+      </package>
+    </affects>
+    <description>
+      <body xmlns="http://www.w3.org/1999/xhtml">
+	<p>Varnish Cache Project reports:</p>
+	<blockquote cite="https://www.varnish-cache.org/lists/pipermail/varnish-announce/2013-October/000686.html">
+	  <p>If Varnish receives a certain illegal request, and the subroutine
+	    'vcl_error{}' restarts the request, the varnishd worker process
+	    will crash with an assert.
+	  </p>
+	  <p>The varnishd management process will restart the worker process, but
+	    there will be a brief interruption of service and the cache will be
+	    emptied, causing more traffic to go to the backend.
+	  </p>
+	  <p>We are releasing this advisory because restarting from vcl_error{} is both fairly common and documented.</p>
+	  <p>This is purely a denial of service vulnerability, there is no risk of privilege escalation.</p>
+	  <p>Workaround</p>
+	  <p>Insert this at the top of your VCL file:</p>
+	  <pre>
+		sub vcl_error {
+			if (obj.status == 400 || obj.status == 413) {
+				return(deliver);
+			}
+		}
+
+		Or add this test at the top of your existing vcl_error{}.
+	  </pre>
+	</blockquote>
+      </body>
+    </description>
+    <references>
+      <cvename>CVE-2013-4484</cvename>
+      <mlist>https://www.varnish-cache.org/lists/pipermail/varnish-announce/2013-October/000686.html</mlist>
+    </references>
+    <dates>
+      <discovery>2013-10-30</discovery>
+      <entry>2014-01-25</entry>
+    </dates>
+  </vuln>
+
   <vuln vid="c0ef849e-84ac-11e3-bec4-9c4e36909cc0">
     <topic>linux-flashplugin -- multiple vulnerabilities</topic>
     <affects>
