svn commit: r436311 - head/security/vuxml

Thu Mar 16 23:00:09 UTC 2017

Author: mandree
Date: Thu Mar 16 23:00:08 2017
New Revision: 436311
URL: https://svnweb.freebsd.org/changeset/ports/436311

Log:
  Document PuTTY < 0.68 agent forwarding vuln.
  
  Security:	CVE-2017-6542
  Security:	9b973e97-0a99-11e7-ace7-080027ef73ec

Modified:
  head/security/vuxml/vuln.xml

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

--- head/security/vuxml/vuln.xml	Thu Mar 16 22:59:19 2017	(r436310)
+++ head/security/vuxml/vuln.xml	Thu Mar 16 23:00:08 2017	(r436311)
@@ -58,6 +58,44 @@ Notes:
   * Do not forget port variants (linux-f10-libxml2, libxml2, etc.)
 -->
 <vuxml xmlns="http://www.vuxml.org/apps/vuxml-1">
+  <vuln vid="9b973e97-0a99-11e7-ace7-080027ef73ec">
+    <topic>PuTTY -- integer overflow permits memory overwrite by forwarded ssh-agent connections</topic>
+    <affects>
+      <package>
+	<name>putty</name>
+	<range><lt>0.68</lt></range>
+      </package>
+    </affects>
+    <description>
+      <body xmlns="http://www.w3.org/1999/xhtml">
+	<p>Simon G. Tatham reports:</p>
+	<blockquote cite="http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-agent-fwd-overflow.html">
+	  <p>Many versions of PuTTY prior to 0.68 have a heap-corrupting integer
+	    overflow bug in the ssh_agent_channel_data function which processes
+	    messages sent by remote SSH clients to a forwarded agent connection. [...]</p>
+	  <p>This bug is only exploitable at all if you have enabled SSH
+	    agent forwarding, which is turned off by default. Moreover, an
+	    attacker able to exploit this bug would have to have already be able
+	    to connect to the Unix-domain socket representing the forwarded
+	    agent connection. Since any attacker with that capability would
+	    necessarily already be able to generate signatures with your agent's
+	    stored private keys, you should in normal circumstances be defended
+	    against this vulnerability by the same precautions you and your
+	    operating system were already taking to prevent untrusted people
+	    from accessing your SSH agent.</p>
+	</blockquote>
+      </body>
+    </description>
+    <references>
+      <url>http://www.chiark.greenend.org.uk/~sgtatham/putty/wishlist/vuln-agent-fwd-overflow.html</url>
+      <cvename>CVE-2017-6542</cvename>
+    </references>
+    <dates>
+      <discovery>2017-01-29</discovery>
+      <entry>2017-03-16</entry>
+    </dates>
+  </vuln>
+
   <vuln vid="4ffb633c-0a3b-11e7-a9f2-0011d823eebd">
     <topic>Flash Player -- multiple vulnerabilities</topic>
     <affects>
