svn commit: r494940 - head/security/vuxml

Thu Mar 7 13:32:43 UTC 2019

Author: cy
Date: Thu Mar  7 13:32:42 2019
New Revision: 494940
URL: https://svnweb.freebsd.org/changeset/ports/494940

Log:
  Document crafted ull dereference ntp attack.
  
  Security:	CVE-2019-8936
  Obtained from:	nwtime.org

Modified:
  head/security/vuxml/vuln.xml

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

--- head/security/vuxml/vuln.xml	Thu Mar  7 13:29:07 2019	(r494939)
+++ head/security/vuxml/vuln.xml	Thu Mar  7 13:32:42 2019	(r494940)
@@ -58,6 +58,55 @@ Notes:
   * Do not forget port variants (linux-f10-libxml2, libxml2, etc.)
 -->
 <vuxml xmlns="http://www.vuxml.org/apps/vuxml-1">
+  <vuln vid="c2576e14-36e2-11e9-9eda-206a8a720317">
+    <topic>ntp -- Crafted null dereference attack from a trusted source with an authenticated mode 6 packet</topic>
+    <affects>
+      <package>
+	<name>ntp</name>
+	<range><lt>4.2.8p13</lt></range>
+      </package>
+      <package>
+	<name>FreeBSD</name>
+	<range><ge>12.0</ge><lt>12.0_2</lt></range>
+	<range><ge>11.2</ge><lt>11.2_8</lt></range>
+      </package>
+    </affects>
+    <description>
+      <body xmlns="http://www.w3.org/1999/xhtml">
+	<p>Network Time Foundation reports:</p>
+	<blockquote cite="http://support.ntp.org/bin/view/Main/SecurityNotice#XXX-fill-this-in-XXX">
+	  <p>A crafted malicious authenticated mode 6 (ntpq) packet from a
+	  permitted network address can trigger a NULL pointer dereference,
+	  crashing ntpd.</p>
+	  <p>Note that for this attack to work, the sending
+	  system must be on an address that the target's ntpd accepts mode 6
+	  packets from, and must use a private key that is specifically
+	  listed as being used for mode 6 authorization.</p>
+	  <p>Impact: The ntpd daemon can crash due to the NULL pointer
+	  dereference, causing a denial of service.</p>
+	  <p>Mitigation:</p>
+	  <ul>
+	    <li>Use restrict noquery to limit addresses that can send mode 6
+	    queries.</li>
+	    <li>Limit access to the private controlkey in ntp.keys.</li>
+	    <li>Upgrade to 4.2.8p13, or later.</li>
+	  </ul>
+	</blockquote>
+      </body>
+    </description>
+    <references>
+      <url>http://bugs.ntp.org/3565</url>
+      <url>http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2019-8936</url>
+      <url>https://nvd.nist.gov/vuln-metrics/cvss/v2-calculator?vector=(AV:N/AC:H/Au:M/C:N/I:N/A:C)</url>
+      <url>https://nvd.nist.gov/vuln-metrics/cvss/v3-calculator?vector=AV:N/AC:H/PR:H/UI:R/S:U/C:N/I:N/A:H</url>
+      <cvename>CVE-2019-8936</cvename>
+    </references>
+    <dates>
+      <discovery>2019-01-15</discovery>
+      <entry>2019-03-07</entry>
+    </dates>
+  </vuln>
+
   <vuln vid="d193aa9f-3f8c-11e9-9a24-6805ca0b38e8">
     <topic>rssh - multiple vulnerabilities</topic>
     <affects>
