TUCoPS :: HP/UX :: ciacg036.txt

HP-UX elm and rdist Vulnerabilities


                       The U.S. Department of Energy
                    Computer Incident Advisory Capability
                           ___  __ __    _     ___
                          /       |     /_\   /
                          \___  __|__  /   \  \___

                             INFORMATION BULLETIN

               HP-UX Vulnerabilities in elm and rdist Programs

August 14, 1996 18:00 GMT                                          Number G-36
PROBLEM:       Vulnerabilities have been discovered in the elm and rdist
               programs running under HP-UX.
PLATFORM:      The elm vulnerability is found on HP 9000 series
               300/400/700/800 systems running any version HP-UX 9.x or 10.x.
               The vulnerability in rdist is only in releases 10.0x, 10.10 and
               10.20 of HP-UX running on HP 9000 series 700 and 800 systems.
DAMAGE:        The elm vulnerability allows user files to be modified by
               non-owners. The rdist vulnerability can allow an unauthorized
               user root access.
SOLUTION:      Apply the patches listed in the vendor section of the bulletin
VULNERABILITY  These vulnerabilities are widely known. It is highly
ASSESSMENT:    recommended that you apply these patches as soon as possible.

[Begin HP Bulletin]

Document Id: [HPSBUX9608-037]
Date Loaded: [08-08-96]

Description: Security Vulnerability in elm


The information in the following Security Advisory 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 Advisory as soon as possible.

PROBLEM:  Vulnerabilities in elm executable.
PLATFORM: HP 9000 series 300/400/700/800 systems running any version HP-UX
          9.X or 10.X.

DAMAGE:   User files can be modified by non-owners.  When running a
          restricted shell escapes may be possible.

SOLUTION: Apply patch PHCO_7204 (series 300/400,HP-UX 9.X), or
                      PHNE_7342 (series 700/800, HP-UX 9.X), or
                      PHNE_7343 (series 700/800, HP-UX 10.X).
          All of the patches are available now.
          For BLS system patch availability please contact your support


I.    elm

   A. Background

      Based on information detailed in CERT(sm) Vendor-Initiated Bulletin
      VB-95:10 Hewlett-Packard has found problems in the version of elm
      shipped with currently supported HP-UX releases.

   B. Fixing the problem

      Hewlett-Packard has created the above patches using the information
      from the vendor.  These vulnerabilities can be eliminated by
      installing the patches referenced herein.

   C. Impact of the patch

      The patches provide a new version of the necessary executables
      to fix the vulnerability.  Installation instructions are contained
      within the patches.

   D. To subscribe to automatically receive future NEW HP Security
      Bulletins from the HP SupportLine mail service via electronic
      mail, send an email message to:

      support@us.external.hp.com   (no Subject is required)

      Multiple instructions are allowed in the TEXT PORTION OF THE
      MESSAGE, here are some basic instructions you may want to use:

      To add your name to the subscription list for new security
      bulletins, send the following in the TEXT PORTION OF THE MESSAGE:

                  subscribe security_info

      To retrieve the index of all HP Security Bulletins issued to
      date, send the following in the TEXT PORTION OF THE MESSAGE:

                  send security_info_list

      To get a patch matrix of current HP-UX and BLS security
      patches referenced by either Security Bulletin or Platform/OS,
      put the following in the text portion of your message:

                  send hp-ux_patch_matrix

      World Wide Web service for browsing of bulletins is available
      via our URL: http://us.external.hp.com

       Choose "Support news", then under Support news,
       choose "Security Bulletins"

   E. To report new security vulnerabilities, send email to


      Please encrypt 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 purposes.

     Any other use of this information is prohibited. HP is not liable
     for any misuse of this information by any third party.
Document Id: [HPSBUX9608-036]
Date Loaded: [08-08-96]

Description: Security Vulnerability in rdist


Hewlett-Packard recommends that 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.


PROBLEM:  Security vulnerability in rdist only in releases 10.0X, 10.10,
          & 10.20 of HP-UX.
PLATFORM: HP 9000 Series 700 and 800s
DAMAGE:   A vulnerability in rdist exists allowing local users to gain
          root privileges.
SOLUTION: Apply patches PHNE_8107 (series 700/800, HP-UX 10.00 & 10.01)
                    and PHCO_7798 (series 700/800, HP_UX 10.00 & 10.01)
               or patch PHNE_7919 (series 700/800, HP-UX 10.10)
                        PHNE_7920 (series 700/800, HP-UX 10.20)

AVAILABILITY: All patches are available now, except PHNE_7920 which
          will be available after 8 August.
I. rdist Update

   A. Background
   A recent CERT advisory (CERT CA-96.14) more fully describes a
   vulnerability in the rdist utility.  It has been found that specific
   HP-UX 10.XX releases have this vulnerability.

   B. Fixing the problem

   The vulnerability can be eliminated from releases 10.0, 10.01, 10.10,
   and 10.20 of HP-UX by applying the patches mentioned above.  HP-UX
   releases prior to 10.X and after 10.20 (i.e., 10.30) are not

   Hewlett-Packard recommends that all customers concerned with the
   security of their HP-UX systems either apply the appropriate patch
   or change perform the actions described above as soon as possible.

   C. How to Install the Patch (for HP-UX 10.X)

   1. Determine which patch is appropriate for your hardware platform
      and operating system:


                PHNE_8107 for series 700/800, HP-UX 10.00 10.01
                PHCO_7798 for series 700/800, HP_UX 10.00 10.01


                PHNE_7919 for series 700/800, HP-UX 10.10
                PHNE_7920 for series 700/800, HP-UX 10.20

   2. Hewlett Packard's HP-UX patches are available via email and World
      Wide Web.

      To obtain a copy of the HP SupportLine email service user's guide,
      send the following in the TEXT PORTION OF THE MESSAGE to
      support@us.external.hp.com (no Subject is required):

                      send guide

      The users guide explains the process for downloading HP-UX patches
      via email and other services available.

       World Wide Web service for downloading of patches is available
       via our URL:

   3.  Apply the necessary patch(es) to your HP-UX system.

   4.  Examine /tmp/update.log for any relevant WARNINGs or ERRORs.

[End HP Bulletin]

CIAC wishes to acknowledge the contributions of Hewlett Packard for the
information contained in this bulletin.

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