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Security Bulletins Digest
From: aleph1 () UNDERGROUND ORG (Aleph One)
Date: Mon, 14 Feb 2000 07:40:55 -0800

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Digest Name:  Daily Security Bulletins Digest
    Created:  Mon Feb 14  3:00:03 PST 2000

Table of Contents:

Document ID      Title
---------------  -----------
HPSBUX0001-110   Security Vulnerability with PMTU strategy (revised)

The documents are listed below.

Document ID:  HPSBUX0001-110
Date Loaded:  20000213
      Title:  Security Vulnerability with PMTU strategy (revised)

Last Revised:  11 Feb. 2000

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:  An HP-UX 10.30, 11.00, or 11.04 system can be used as an IP
          traffic amplifier.  Small amounts of inbound traffic can result
          in larger amounts of outbound traffic.

---->>>   HP-UX releases 10.30, 11.00 and 11.04 only.

DAMAGE:   Depending upon the amount and nature of inbound traffic, an
          HP-UX 10.30/11.00/11.04 system can be used to flood a target
          system with IP packets which could result in a denial of

SOLUTION: Set the NDD parameter ip_pmtu_strategy to 1.

AVAILABILITY: This capability is already available.
CHANGE SUMMARY:  Added HP-UX VirtualVault release 11.04.
   A. Background
      HP provides a proprietary method for determining PMTU.  When
      traffic needs to be routed to a destination for which the optimum
      MTU has not been determined, ICMP packets are used to discover
      the MTU for that path while data traffic is shipped in parallel.
      This is the default strategy for determining PMTU.

   B. Recommended solution
      Reference ndd manpage (1M), /etc/rc.config.d/nddconf

      To ensure that this parameter is set each time the system
      is booted, add the following lines to /etc/rc.config.d/nddconf


      The value of <index> is an integer from 0 to 99.  The first
      parameter specified in the file should use an <index> of
      0, the second an <index> of 1, and so on.

      Once these changes have been made, execute the following

      /usr/bin/ndd -c

      This sets all of the options specified in the file

      To verify that the parameter is set correctly, use the following
                /usr/bin/ndd -get /dev/ip ip_pmtu_strategy

      This should report a value of 1.

      Another way to  change the ip_pmtu_strategy parameter on a running
      system is to use the following NDD command:

                /usr/bin/ndd -set /dev/ip ip_pmtu_strategy 1

      This setting will only last until the system is rebooted
      at which point the value of the parameter will be determined by the
      default value of 2 or whatever value is set in

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    E. To report new security vulnerabilities, send email to
       security-alert () hp com 

       Please encrypt any exploit information using the security-alert
       PGP key, available from your local key server, or by sending a
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      Permission is granted for copying and circulating this Advisory to
      Hewlett-Packard (HP) customers (or the Internet community) for the
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      is not edited or changed in any way, is attributed to HP, and
      provided such reproduction and/or distribution is performed for
      non-commercial purposes.

      Any other use of this information is prohibited.  HP is not liable
      for any misuse of this information by any third party.
-----End of Document ID:  HPSBUX0001-110--------------------------------------

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