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From: Slackware Security Team <>
Subject: [slackware-security] ntp (SSA:2014-044-02)
Date: Thu, 13 Feb 2014 16:38:35 -0800 (PST)
Hash: SHA1

[slackware-security]  ntp (SSA:2014-044-02)

New ntp packages are available for Slackware 13.0, 13.1, 13.37, 14.0, 14.1,
and -current to fix a security issue.

Here are the details from the Slackware 14.1 ChangeLog:
patches/packages/ntp-4.2.6p5-i486-5_slack14.1.txz:  Rebuilt.
  All stable versions of NTP remain vulnerable to a remote attack where the
  "ntpdc -c monlist" command can be used to amplify network traffic as part
  of a denial of service attack.  By default, Slackware is not vulnerable
  since it includes "noquery" as a default restriction.  However, it is
  vulnerable if this restriction is removed.  To help mitigate this flaw,
  "disable monitor" has been added to the default ntp.conf (which will disable
  the monlist command even if other queries are allowed), and the default
  restrictions have been extended to IPv6 as well.
  All users of the NTP daemon should make sure that their ntp.conf contains
  "disable monitor" to prevent misuse of the NTP service.  The new ntp.conf
  file will be installed as /etc/ with a package upgrade, but the
  changes will need to be merged into any existing ntp.conf file by the admin.
  For more information, see:
  (* Security fix *)

Where to find the new packages:

Thanks to the friendly folks at the OSU Open Source Lab
( for donating FTP and rsync hosting
to the Slackware project!  :-)

Also see the "Get Slack" section on for
additional mirror sites near you.

Updated package for Slackware 13.0:

Updated package for Slackware x86_64 13.0:

Updated package for Slackware 13.1:

Updated package for Slackware x86_64 13.1:

Updated package for Slackware 13.37:

Updated package for Slackware x86_64 13.37:

Updated package for Slackware 14.0:

Updated package for Slackware x86_64 14.0:

Updated package for Slackware 14.1:

Updated package for Slackware x86_64 14.1:

Updated package for Slackware -current:

Updated package for Slackware x86_64 -current:

MD5 signatures:

Slackware 13.0 package:
3accaa602c77da7b13489043771af46c  ntp-4.2.6p5-i486-1_slack13.0.txz

Slackware x86_64 13.0 package:
df5a6488330ea4f272b6989dc7265187  ntp-4.2.6p5-x86_64-1_slack13.0.txz

Slackware 13.1 package:
54a1f268bfa1d08a998fe67a1ac72b25  ntp-4.2.6p5-i486-1_slack13.1.txz

Slackware x86_64 13.1 package:
bfa576d25822d68e2774b2e8b2977fee  ntp-4.2.6p5-x86_64-1_slack13.1.txz

Slackware 13.37 package:
5a098aa45264a2db66bb64437e0a5323  ntp-4.2.6p5-i486-1_slack13.37.txz

Slackware x86_64 13.37 package:
d46a9faf04b6bb1f10da492bd2150bfe  ntp-4.2.6p5-x86_64-1_slack13.37.txz

Slackware 14.0 package:
8cb41c56322999a0bfd77b62afdb4b78  ntp-4.2.6p5-i486-3_slack14.0.txz

Slackware x86_64 14.0 package:
9b1fef2c9768655d6e563b51ef996cb4  ntp-4.2.6p5-x86_64-3_slack14.0.txz

Slackware 14.1 package:
45a99f84f5b8de1711f55905f2b956bb  ntp-4.2.6p5-i486-5_slack14.1.txz

Slackware x86_64 14.1 package:
09f5e6d88e4eeb3e77629bf4a35bb319  ntp-4.2.6p5-x86_64-5_slack14.1.txz

Slackware -current package:
28f145dd7fa671cd85b507ee5a73ab59  n/ntp-4.2.6p5-i486-5.txz

Slackware x86_64 -current package:
d47b61aa02c44ceb1ea634bd2dc2a7f5  n/ntp-4.2.6p5-x86_64-5.txz

Installation instructions:

Upgrade the package as root:
# upgradepkg ntp-4.2.6p5-i486-5_slack14.1.txz

Ensure that your /etc/ntp.conf contains a line like this:
disable monitor

Then, restart the NTP daemon:

# sh /etc/rc.d/rc.ntpd restart


Slackware Linux Security Team

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