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Digest Name:  daily security bulletins digest
    Created:  Mon Apr  9  5:40:03 PDT 2001

Table of Contents:

Document ID      Title
---------------  -----------
HPSBUX0104-148   Sec. Vulnerability in xntpd(1M)

The documents are listed below.
-------------------------------------------------------------------------------


Document ID:  HPSBUX0104-148
Date Loaded:  20010407
      Title:  Sec. Vulnerability in xntpd(1M)

-------------------------------------------------------------------------
    HEWLETT-PACKARD COMPANY SECURITY ADVISORY: #0148, 06 Apr. '01
-------------------------------------------------------------------------

The information in the following Security Advisory should be acted upon
as soon as possible.  Hewlett-Packard Company will not be liable for any
consequences to any customer resulting from customer's failure to fully
implement instructions in this Security Advisory as soon as possible.

-------------------------------------------------------------------------
PROBLEM:  The HP-UX NTP daemon contains an exploitable vulnerability.

PLATFORM: HP9000 Series 700/800 running HP-UX releases 10.XX and 11.XX.

DAMAGE:   Possible denial of service, increase of priviledge.

SOLUTION: Install the workaround configuration detailed below.

AVAILABILITY: Patches are currently being developed, whereupon this
              advisory will be upgraded to a bulletin.
-------------------------------------------------------------------------
I.
   A. Background
      A buffer overflow has been discovered on various Unix-derived
      operating systems in its NTP daemon.  Hewlett-Packard Company
      ships xntpd on HP-UX releases and has determined that it too,
      is vulnerable.

   B. Recommended solution
      Hewlett-Packard Company recommends that xntpd be shut down
      on all systems not absolutely needing time-of-day synchronization
      with Internet standard time servers.

      On those remaining time-sensitive systems modify the default
      configuration file (/etc/ntp.conf) to use the "restrict" clause,
      to restrict all but allow some.

      We provide an example of a simple configuration.  Please refer
      to the man (1M) xntpd for further configuration details.

        # This server syncs from server 192.255.2.3 and provides
        # time services to client 192.27.16.30,  yet
        # blocks all others.

        server 192.255.2.3 prefer
        server 127.127.1.1

        # allow this client full access
        restrict 192.27.16.30

        # allow this server full access
        restrict 192.255.2.3

        # you need both of the following for the localhost
        restrict 127.0.0.1
        restrict 127.127.1.1

        # block everything else
        restrict default ignore

      NOTE:  Patches are currently in development.


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________________________________________________________________________
-----End of Document ID:  HPSBUX0104-148--------------------------------------