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TUCoPS :: HP/UX :: n-094.txt

HP Potential Security Vulnerability in wall 1M (CIAC N-094)


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

                             INFORMATION BULLETIN

                HP Potential Security Vulnerability in wall(1M)
                        [Hewlett-Packard HPSBUX0305-258]

May 8, 2003 17:00 GMT                                             Number N-094
[Revised 14 May 2003]
PROBLEM:       HP has identified a potential vulnerability in the wall(1M) 
               command. This command is used to warn all users, typically, 
               prior to a shutting down of the system. 
PLATFORM:      All HP9000 servers/workstations running HP-UX releases 10.20, 
               11.00, and 11.11. 
DAMAGE:        If exploited, this vulnerability could allow a local attacker 
               the ability to cause a denial of service, to increase privileges
               or to gain unauthorized access. 
SOLUTION:      Apply available patches. 
VULNERABILITY  The risk is MEDIUM. The sender must be superuser to override 
ASSESSMENT:    any protections the users may have invoked. 

Revision 5/14/03:  Additional HP-UX Patch releases.

[***** Start Hewlett-Packard HPSBUX0305-258 *****]


Document ID:  HPSBUX0305-258
Date Loaded:  20030518
      Title:  SSRT3483 Potential Security Vulnerability in wall(1M) command rev.1

Hash: SHA1

 ** REVISED 01 **
 Originally issued: 06 May 2003
 Last revised:      14 May 2003
 SSRT3483 Potential Security Vulnerability in wall(1M) command

NOTICE: There are no restrictions for distribution of this
Bulletin provided that it remains complete and intact.

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

PROBLEM: wall(1M) contains a locally exploitable vulnerability.

IMPACT:  Potential privilege increase or Denial of Service (DoS).

** REVISED 01 **
PLATFORM: All HP9000 servers/workstations running HP-UX releases
  --->    10.20, 11.00, 11.04, and 11.11.

** REVISED 01 **
SOLUTION: Apply the appropriate patch for HP-UX releases:
          PHCO_28717         for 10.20,
          PHCO_28718         for 11.00,
  --->    PHCO_29085         for 11.04,
          PHCO_28719         for 11.11.


AVAILABILITY:  All patches are available now on <>.
 A. Background
    The wall(1M) command which is sgid, contains a vulnerability
    which potentially could be locally used to increase privilege
    or gain unauthorized access.

    NOTE: This problem does not impact HP NonStop Servers,
          HP OpenVMS, HP Tru64 UNIX/Trucluster Servers.

** REVISED 01 **
 B. Recommended solution
    Retrieve and install the appropriate patch for the systems in
    question from <>.

              PHCO_28717         for 10.20,
              PHCO_28718         for 11.00,
  --->        PHCO_29085         for 11.04,
              PHCO_28719         for 11.11.

 C. To subscribe to automatically receive future NEW HP Security
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    To -subscribe- to future HP Security Bulletins or other
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    To -review- bulletins already released, select the link
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    NOTE: Using your itrc account security bulletins can be
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    To -gain access- to the Security Patch Matrix, select
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    field specifies "No."

    The Security Patch Check tool can verify that a security
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    that the fix is completely implemented in a patch with no
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    For information on the Security Patch Check tool, see:

    The security patch matrix is also available via anonymous

    On the "Support Information Digest Main" page:
    click on the "HP Security Bulletin Archive".

    The PGP key used to sign this bulletin is available from
    several PGP Public Key servers.  The key identification
    information is:

       HP Security Response Team (Security Bulletin signing only)
       Fingerprint =
         6002 6019 BFC1 BC62 F079 862E E01F 3AFC 2D2A 7D59

    If you have problems locating the key please write to  Please note that this key is
    for signing bulletins only and is not the key returned
    by sending 'get key' to

 D. 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


(c)Copyright 2003 Hewlett-Packard Company
Hewlett-Packard Company shall not be liable for technical or
editorial errors or omissions contained herein. The information
in this document is subject to change without notice.
Hewlett-Packard Company and the names of HP products referenced
herein are trademarks and/or service marks of Hewlett-Packard
Company.  Other product and company names mentioned herein may be
trademarks and/or service marks of their respective owners.

- --

Version: PGP 8.0


[***** End Hewlett-Packard HPSBUX0305-258 *****]

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

CIAC, the Computer Incident Advisory Capability, is the computer
security incident response team for the U.S. Department of Energy
(DOE) and the emergency backup response team for the National
Institutes of Health (NIH). CIAC is located at the Lawrence Livermore
National Laboratory in Livermore, California. CIAC is also a founding
member of FIRST, the Forum of Incident Response and Security Teams, a
global organization established to foster cooperation and coordination
among computer security teams worldwide.

CIAC services are available to DOE, DOE contractors, and the NIH. CIAC
can be contacted at:
    Voice:    +1 925-422-8193 (7x24)
    FAX:      +1 925-423-8002
    STU-III:  +1 925-423-2604

Previous CIAC notices, anti-virus software, and other information are
available from the CIAC Computer Security Archive.

   World Wide Web:
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PLEASE NOTE: Many users outside of the DOE, ESnet, and NIH computing
communities receive CIAC bulletins.  If you are not part of these
communities, please contact your agency's response team to report
incidents. Your agency's team will coordinate with CIAC. The Forum of
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organization. A list of FIRST member organizations and their
constituencies can be obtained via WWW at

This document was prepared as an account of work sponsored by an
agency of the United States Government. Neither the United States
Government nor the University of California nor any of their
employees, makes any warranty, express or implied, or assumes any
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