Add SA-16:24.ntp.

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2016-06-04 06:51:08 +00:00 · 2016-06-04 06:51:08 +00:00 · 97d46c0b16 · 2020-12-08 03:00:23 +00:00
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--- a/share/security/advisories/FreeBSD-SA-16:24.ntp.asc
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+-----BEGIN PGP SIGNED MESSAGE-----
+Hash: SHA512
+
+=============================================================================
+FreeBSD-SA-16:24.ntp                                        Security Advisory
+                                                          The FreeBSD Project
+
+Topic:          Multiple vulnerabilities of ntp
+
+Category:       contrib
+Module:         ntp
+Announced:      2016-06-04
+Credits:        Network Time Foundation and various contributors listed below
+Affects:        All supported versions of FreeBSD.
+Corrected:      2016-06-03 08:59:21 UTC (stable/10, 10.3-STABLE)
+                2016-06-04 05:46:52 UTC (releng/10.3, 10.3-RELEASE-p5)
+                2016-06-04 05:46:52 UTC (releng/10.2, 10.2-RELEASE-p19)
+                2016-06-04 05:46:52 UTC (releng/10.1, 10.1-RELEASE-p36)
+                2016-06-03 09:03:10 UTC (stable/9, 9.3-STABLE)
+                2016-06-04 05:46:52 UTC (releng/9.3, 9.3-RELEASE-p44)
+CVE Name:       CVE-2016-4957, CVE-2016-4953, CVE-2016-4954, CVE-2016-4955
+                CVE-2016-4956
+
+For general information regarding FreeBSD Security Advisories,
+including descriptions of the fields above, security branches, and the
+following sections, please visit <URL:https://security.FreeBSD.org/>.
+
+I.   Background
+
+The ntpd(8) daemon is an implementation of the Network Time Protocol (NTP)
+used to synchronize the time of a computer system to a reference time
+source.
+
+II.  Problem Description
+
+Multiple vulnerabilities have been discovered in the NTP suite:
+
+The fix for Sec 3007 in ntp-4.2.8p7 contained a bug that could cause ntpd to
+crash. [CVE-2016-4957, Reported by Nicolas Edet of Cisco]
+
+An attacker who knows the origin timestamp and can send a spoofed packet
+containing a CRYPTO-NAK to an ephemeral peer target before any other
+response is sent can demobilize that association. [CVE-2016-4953, Reported by
+Miroslav Lichvar of Red Hat]
+
+An attacker who is able to spoof packets with correct origin timestamps
+from enough servers before the expected response packets arrive at the
+target machine can affect some peer variables and, for example,
+cause a false leap indication to be set. [CVE-2016-4954, Reported by
+Jakub Prokes of Red Hat]
+
+An attacker who is able to spoof a packet with a correct origin timestamp
+before the expected response packet arrives at the target machine can
+send a CRYPTO_NAK or a bad MAC and cause the association's peer variables
+to be cleared. If this can be done often enough, it will prevent that
+association from working. [CVE-2016-4955, Reported by Miroslav Lichvar
+of Red Hat]
+
+The fix for NtpBug2978 does not cover broadcast associations, so broadcast
+clients can be triggered to flip into interleave mode. [CVE-2016-4956,
+Reported by Miroslav Lichvar of Red Hat.]
+
+III. Impact
+
+Malicious remote attackers may be able to break time synchronization,
+or cause the ntpd(8) daemon to crash.
+
+IV.  Workaround
+
+No workaround is available, but systems not running ntpd(8) are not
+affected.  Network administrators are advised to implement BCP-38,
+which helps to reduce the risk associated with the attacks.
+
+V.   Solution
+
+Perform one of the following:
+
+1) Upgrade your vulnerable system to a supported FreeBSD stable or
+release / security branch (releng) dated after the correction date.
+
+The ntpd service has to be restarted after the update.  A reboot is
+recommended but not required.
+
+2) To update your vulnerable system via a binary patch:
+
+Systems running a RELEASE version of FreeBSD on the i386 or amd64
+platforms can be updated via the freebsd-update(8) utility:
+
+# freebsd-update fetch
+# freebsd-update install
+
+The ntpd service has to be restarted after the update.  A reboot is
+recommended but not required.
+
+3) To update your vulnerable system via a source code patch:
+
+The following patches have been verified to apply to the applicable
+FreeBSD release branches.
+
+a) Download the relevant patch from the location below, and verify the
+detached PGP signature using your PGP utility.
+
+# fetch https://security.FreeBSD.org/patches/SA-16:24/ntp.patch
+# fetch https://security.FreeBSD.org/patches/SA-16:24/ntp.patch.asc
+# gpg --verify ntp.patch.asc
+
+b) Apply the patch.  Execute the following commands as root:
+
+# cd /usr/src
+# patch < /path/to/patch
+
+c) Recompile the operating system using buildworld and installworld as
+described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.
+
+Restart the applicable daemons, or reboot the system.
+
+VI.  Correction details
+
+The following list contains the correction revision numbers for each
+affected branch.
+
+Branch/path                                                      Revision
+- -------------------------------------------------------------------------
+stable/9/                                                         r301257
+releng/9.3/                                                       r301301
+stable/10/                                                        r301256
+releng/10.1/                                                      r301301
+releng/10.2/                                                      r301301
+releng/10.3/                                                      r301301
+- -------------------------------------------------------------------------
+
+To see which files were modified by a particular revision, run the
+following command, replacing NNNNNN with the revision number, on a
+machine with Subversion installed:
+
+# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
+
+Or visit the following URL, replacing NNNNNN with the revision number:
+
+<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
+
+VII. References
+
+<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4957>
+
+<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4953>
+
+<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4954>
+
+<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4955>
+
+<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4956>
+
+The latest revision of this advisory is available at
+<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.asc>
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--- a/share/security/patches/SA-16:24/ntp.patch
+++ b/share/security/patches/SA-16:24/ntp.patch
--- a/share/security/patches/SA-16:24/ntp.patch.asc
+++ b/share/security/patches/SA-16:24/ntp.patch.asc
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--- a/share/xml/advisories.xml
+++ b/share/xml/advisories.xml
@ -7,6 +7,18 @@
  <year>
    <name>2016</name>

+    <month>
+      <name>6</name>
+
+      <day>
+        <name>4</name>
+
+        <advisory>
+          <name>FreeBSD-SA-16:24.ntp</name>
+        </advisory>
+      </day>
+    </month>
+
    <month>
      <name>5</name>