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>>                                                      CERT-NL, 01-Mar-2000 <<
>> All CERT-NL information has been moved to http://cert.surfnet.nl.  Links  <<
>> to CERT-NL information contained in this advisory are therefore outdated. <<
>>                                                                           <<
>> CERT-NL also has stopped the CERT-CC-Mirror service.  Due to this the     <<
>> links to the CERT-CC mirror are obsolete. Visit the CERT-CC site for the  <<
>> complete CERT-CC advisory texts:                     http://www.cert.org  <<
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Security Advisory                                                       CERT-NL
===============================================================================
Author/Source : Teun Nijssen                                Index  :    S-00-01
Distribution  : World                                       Page   :          1
Classification: External                                    Version:          1
Subject       : HP Aserver                                  Date   :01-Jan-2000
===============================================================================

By courtesy of HEWLETT-PACKARD COMPANY we received
information on a vulnerability in /opt/audio/bin/Aserver

CERT-NL recommends to disable the audio server and start the year, the century
and the millennium silently after all that firework.

 -------------------------------------------------------------------------
    HEWLETT-PACKARD COMPANY SECURITY ADVISORY: #00108, 01 Jan 2000
 -------------------------------------------------------------------------

PROBLEM:  /opt/audio/bin/Aserver can be used to gain root access.

PLATFORM: HP9000 Series 7/800 running HP-UX releases 10.X and 11.X

DAMAGE:   Root access is possible.

SOLUTION: Until patches are available disable the Aserver (see below).

AVAILABILITY:  This advisory will be updated when patches are available.

 -------------------------------------------------------------------------
I.
   A. Background
      A procedure to use /opt/audio/bin/Aserver to gain root access
      has been made public.

   B. Recommended solution
      Until a patch is available, the only two temporary fixes currently
      available are to disable /opt/audio/bin/Aserver by removing the
      file, or to remove execute permissions as follows.

      As root remove functionality with:

            chmod 400 /opt/audio/bin/Aserver

      As an alternative, if it is absolutely necessary to run the Aserver,
      it can be run - yet the system will be vulnerable while the Aserver
      is starting.
      Again as root:

            chmod 6555 /opt/audio/bin/Aserver

            [***Warning - /opt/audio/bin/Aserver is now vulnerable.***]

            /opt/audio/bin/Aserver -f

            [Wait for the parent and child processes to start.]

            chmod 400 /opt/audio/bin/Aserver

            [/opt/audio/bin/Aserver is now safe.]
===============================================================================
CERT-NL is the Computer Emergency Response Team for SURFnet customers. SURFnet
is the Dutch network for educational, research and related institutes. CERT-NL
is a member of the Forum of Incident Response and Security Teams (FIRST).

All CERT-NL material is available under:
  http://cert.surfnet.nl/

In case of computer or network security problems please contact your local
CERT/security-team or CERT-NL  (if your institute is NOT a SURFnet customer
please address the appropriate (local) CERT/security-team).

CERT-NL is one/two hour(s) ahead of UTC (GMT) in winter/summer,
i.e. UTC+0100 in winter and UTC+0200 in summer (DST).

   Email:     cert-nl@surfnet.nl     ATTENDED REGULARLY ALL DAYS
   Phone:     +31 302 305 305        BUSINESS HOURS ONLY
   Fax:       +31 302 305 329        BUSINESS HOURS ONLY
   Snailmail: SURFnet bv
              Attn. CERT-NL
              P.O. Box 19035
              NL - 3501 DA  UTRECHT
              The Netherlands

NOODGEVALLEN:    06 22 92 35 64      ALTIJD BEREIKBAAR
EMERGENCIES : +31 6 22 92 35 64      ATTENDED AT ALL TIMES
CERT-NL'S EMERGENCY PHONENUMBER IS ONLY TO BE USED IN CASE OF EMERGENCIES:
THE SURFNET HELPDESK OPERATING THE EMERGENCY NUMBER HAS A *FIXED*
PROCEDURE FOR DEALING WITH YOUR ALERT AND WILL IN REGULAR CASES RELAY IT
TO CERT-NL IN AN APPROPRIATE MANNER. CERT-NL WILL THEN CONTACT YOU.
===============================================================================

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