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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 to CERT-NL information contained in this advisory are therefore outdated.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 : CERT-NL (Gert Meijerink)                    Index  :    S-93-01
Distribution  : SURFnet constituency                        Page   :          1
Classification: External                                    Version:      Final
Subject       : HP NIS Vulnerability Advisory(REVISED)      Date   :  18-jan-93
===============================================================================

THIS IS A REVISED CERT-NL ADVISORY AND SUPERSEDES CERT-NL ADVISORY
S-92-21.

CERT-NL has received information from the CERT Coordination Center
concerning a vulnerability in the NIS ypbind module for the
Hewlet-Packard (HP) HP/UX Operating System for series 300, 700, and 800
computers.

IN THE NETHERLANDS IS FOR INFORMATION THE HP SUPPORTLINE AVAILABLE AT
020-5479666. THIS NUMBER IS ONLY FOR HP CUSTOMERS WITH A HP-SUPPORT
CONTRACT.
- --------------------------------------------------------------------------------

HP has provided revised patches for all of the HP/UX level 8 releases
(8.0, 8.02, 8.06, and 8.07).  This problem is fixed in HP/UX 9.0.
The following patches have been superseded:

              Patch ID        Replaced by Patch ID
              PHNE_1359       PHNE_1706
              PHNE_1360       PHNE_1707
              PHNE_1361       PHNE_1708

All HP NIS clients and servers running ypbind should obtain and 
install the patch appropriate for their machine's architecture
as described below.

- -----------------------------------------------------------------------------

I.   Description

     A vulnerability in HP NIS allows unauthorized access to NIS data.

II.  Impact

     Root on a remote host running any vendor's implementation of NIS
     can gain root access on any local host running HP's NIS ypbind. 
     Local users of a host running HP's NIS ypbind can also gain root access.

III. Solution
        
     1) All HP NIS clients and servers running ypbind should obtain and 
        install the patch appropriate for their machine's architecture.

        These patches contain a version of ypbind that only accepts ypset
        requests from a superuser port on the local host.  This prevents
        a non-superuser program from sending rogue ypset requests to ypbind.
        They also include the mod from the superseded patches which prevented
        a superuser on a remote system from issuing a ypset -h command
        to the local system and binding the system to a rogue ypserver.

        These patches may be obtained from HP via FTP (this is NOT
        anonymous FTP) or the HP SupportLine.  To obtain HP security
        patches, you must first register with the HP SupportLine.
        The registration instructions are available via
  anonymous FTP at cert.org (192.88.209.5) in the file
  "pub/vendors/hp/supportline_and_patch_retrieval".
        The new patch files are:

     Architecture Patch ID   Filename                               Checksum
     ------------ --------   --------                               --------
     Series 300   PHNE_1706  /hp-ux_patches/s300_400/8.X/PHNE_1706  38955 212
     Series 700   PHNE_1707  /hp-ux_patches/s700/8.X/PHNE_1707        815 311
     Series 800   PHNE_1708  /hp-ux_patches/s800/8.X/PHNE_1708      56971 299

     2) The instructions for installing the patch are provided in the
        PHNE_xxxx.text file (this file is created after the patch has
        been unpacked).

        The checksums listed above are for the patch archive files from HP.
        Once unpacked, each shell archive contains additional checksum 
        information in the file "patchfilename.text".  This checksum is
        applicable to the binary patch file "patchfilename.updt".


If you have any questions about obtaining or installing the patches,
contact the USA HP SupportLine at 415-691-3888, or your local HP
SupportLine number.  Please note that the telephone numbers in this
advisory are appropriate for the USA and Canada. 

- -----------------------------------------------------------------------------
The CERT Coordination Center wishes to thank Brian Kelley of Ford Motor
Company for bringing this vulnerability to our attention.  We would also
like to thank Hewlett-Packard for their response to this problem. 
- -----------------------------------------------------------------------------


==============================================================================
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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