Operating System:


31 December 1996

Protect yourself against future threats.


              AUSCERT External Security Bulletin Redistribution

           ESB-97.001 -- Hewlett Packard Advisory on direct audio
                               1 January 1997


Hewlett Packard has released the following security bulletin concerning
a vulnerability which may allow a denial of service attack against machines
running HP-UX 10.10 and 10.20.  This vulnerability requires local user
access and may cause system panics.

AUSCERT advises that all sites apply the appropriate fixes or workarounds
described in the advisory as soon as possible.

If you believe that your system has been compromised, contact AUSCERT or your
representative in FIRST (Forum of Incident Response and Security Teams).

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 4477
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
	AUSCERT personnel answer during Queensland business hours
	which are GMT+10:00 (AEST).
	On call after hours for emergencies.

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                    ***HP SupportLine Mail Service Notice***

This digest contains a summary of all newly received Security Bulletins.

You do not have to have any form of support from Hewlett-Packard to subscribe
to this digest or to procure the recommended patches via the HP SupportLine
mail service.

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To obtain a copy of the HP SupportLine mail service user's guide, send the
following (in the TEXT PORTION OF THE MESSAGE to) to the HP SupportLine mail

To: support@us.external.hp.com

Message Text:

 send guide

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To obtain a patch identified within this Security Bulletin, send the following
(in the TEXT PORTION OF THE MESSAGE) to the HP SupportLine mail service.

To: support@us.external.hp.com

Message Text:

 send xxxxxxxxxxxx

(where xxxxxxxxxxxx represents the specified patch name).

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If you have concerns about security issues, please forward them to:


The security-alert node is monitored during working hours Pacific Daylight Time
by multiple HP Security Response Team personnel. We reply to your message only
if necessary to obtain additional information.

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Message Text:

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Digest Name: security_info
Description: Daily Security Bulletins Digest
Created:     Tue Dec 24 03:00:01 1996 PST

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Summary of 'Daily Security Bulletins Digest' documents
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Document Id    Description						Page 1
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HPSBUX9612-043 Vulnerability with direct audio user space code
Detailed list of 'Daily Security Bulletins Digest' documents
Document Id: [HPSBUX9612-043]
Date Loaded: [12-24-96]

Description: Vulnerability with direct audio user space code

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

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PROBLEM: Vulnerability with direct audio user space code causes panics

PLATFORM: HP 9000 s700 systems only, running HP-UX version 10.10 or 10.20

DAMAGE: Vulnerability makes it possible for an logged-on user to cause a
        Denial of Service (DoS).

SOLUTION: Apply patch PHKL_9579 (HP-UX 10.10), or
                      PHKL_9580 (HP-UX 10.20).

AVAILABILITY: All patches are available now.

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   A. Background

   A recent mailing list entry described a freeware direct audio
   application that can panic the system.  Currently all audio
   applications shipped by HP use "Aserver", which will not exhibit this
   problem.  The operating system panic occurs only on HP-UX releases
   10.10 and 10.20.  The necessary audio hardware may be found on all
   s700 machines except HP9000 s705, s710 and s74x, which are immune.
   Any machine with CD quality audio hardware will exhibit the problem.

   B. Fixing the problem

   This vulnerability can only be eliminated from HP-UX releases 10.10 and
   10.20 by applying the appropriate patch listed above.

   C. Impact of the patch

   The patches patch the kernel library module /usr/conf/lib/libhp-ux.a
   (audio.o) to fix the vulnerability.  There are no known side effects.
   Installation instructions are contained within the patches.

   D.  To subscribe to automatically receive future NEW HP
   Security Bulletins from the HP SupportLine Digest service via
   electronic mail, do the following:

      1)  From your Web browser, access the URL:

      http://us-support.external.hp.com (US,Canada,
      Asia-Pacific, and Latin-America)

      http://europe-support.external.hp.com  (Europe)

      2)  On the HP Electronic Support Center main screen, select
      the hyperlink "Support Information Digests".

      3)  On the "Welcome to HP's Support Information Digests" screen,
      under the heading "Register Now", select the appropriate hyperlink
      "Americas and Asia-Pacific", or "Europe".

      4)  On the "New User Registration" screen, fill in the fields for
      the User Information and Password and then select the button labeled
      "Submit New User".

      5)  On the "User ID Assigned" screen, select the hyperlink
      "Support Information Digests".

      ** Note what your assigned user ID and password are for future

      6)  You should now be on the "HP Support Information Digests Main"
      screen.  You might want to verify that your email address is correct
      as displayed on the screen.  From this screen, you may also
      view/subscribe to the digests, including the security bulletins

      To get a patch matrix of current HP-UX and BLS security
       patches referenced by either Security Bulletin or Platform/OS,
       click on following screens in order:
         Technical Knowledge Database
         Browse Security Bulletins
         Security Bulletins Archive
         HP-UX Security Patch Matrix

   E. To report new security vulnerabilities, send email to


      Please encrypt any exploit information using the security-alert
      PGP key, available from your local key server, or by sending a
      message with a -subject- (not body) of 'get key' (no quotes) to

   Permission is granted for copying and circulating this Bulletin to
   Hewlett-Packard (HP) customers (or the Internet community) for the
   purpose of alerting them to problems, if and only if, the Bulletin is
   not edited or changed in any way, is attributed to HP, and provided
   such reproduction and/or distribution is performed for non-commercial

   Any other use of this information is prohibited.  HP is not liable
   for any misuse of this information by any third party.

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