svn commit: r441777 - head/security/vuxml

Fri May 26 12:25:38 UTC 2017

Author: feld
Date: Fri May 26 12:25:36 2017
New Revision: 441777
URL: https://svnweb.freebsd.org/changeset/ports/441777

Log:
  Document FreeBSD-SA-17:04.ipfilter

Modified:
  head/security/vuxml/vuln.xml

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

--- head/security/vuxml/vuln.xml	Fri May 26 12:24:33 2017	(r441776)
+++ head/security/vuxml/vuln.xml	Fri May 26 12:25:36 2017	(r441777)
@@ -58,6 +58,48 @@ Notes:
   * Do not forget port variants (linux-f10-libxml2, libxml2, etc.)
 -->
 <vuxml xmlns="http://www.vuxml.org/apps/vuxml-1">
+  <vuln vid="51d1282d-420e-11e7-82c5-14dae9d210b8">
+    <topic>FreeBSD -- ipfilter(4) fragment handling panic</topic>
+    <affects>
+      <package>
+	<name>FreeBSD-kernel</name>
+	<range><ge>11.0</ge><lt>11.0_10</lt></range>
+	<range><ge>10.3</ge><lt>10.3_19</lt></range>
+      </package>
+    </affects>
+    <description>
+      <body xmlns="http://www.w3.org/1999/xhtml">
+	<h1>Problem Description:</h1>
+	<p>ipfilter(4), capable of stateful packet inspection, using
+	the "keep state" or "keep frags" rule options, will not
+	only maintain the state of connections, such as TCP streams
+	or UDP communication, it also maintains the state of
+	fragmented packets. When a packet fragments are received
+	they are cached in a hash table (and linked list). When a
+	fragment is received it is compared with fragments already
+	cached in the hash table for a match. If it does not match
+	the new entry is used to create a new entry in the hash
+	table. If on the other hand it does match, unfortunately
+	the wrong entry is freed, the entry in the hash table. This
+	results in use after free panic (and for a brief moment
+	prior to the panic a memory leak due to the wrong entry
+	being freed).</p>
+	<h1>Impact:</h1>
+	<p>Carefully feeding fragments that are allowed to pass by
+	an ipfilter(4) firewall can be used to cause a panic followed
+	by reboot loop denial of service attack.</p>
+      </body>
+    </description>
+    <references>
+      <cvename>CVE-2017-1081</cvename>
+      <freebsdsa>SA-17:04.ipfilter</freebsdsa>
+    </references>
+    <dates>
+      <discovery>2017-04-27</discovery>
+      <entry>2017-05-26</entry>
+    </dates>
+  </vuln>
+
   <vuln vid="3c0237f5-420e-11e7-82c5-14dae9d210b8">
     <topic>FreeBSD -- Multiple vulnerabilities of ntp</topic>
     <affects>
