TUCoPS :: HP/UX :: ciacj015.txt

HP Sharedx Dos Vulnerability

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             __________________________________________________________

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

                             INFORMATION BULLETIN

                   HP SharedX Denial-of-Service Vulnerability

October 29, 1998 16:00 GMT                                        Number J-015
______________________________________________________________________________
PROBLEM:       A vulnerability exist in the SharedX Receiver Service
               (recserv).
PLATFORM:      HP 9000 series 700/800.
DAMAGE:        Certain messages to the port can cause recserv to enter a tight
               processing loop. This processing could cause excessive cpu
               usage resulting in a denial of service.
SOLUTION:      Install the patches listed below.
______________________________________________________________________________
VULNERABILITY  Risk is medium. Hewlett-Packard does recommend that the patches
ASSESSMENT:    be installed as soon as possible.
______________________________________________________________________________

[  Start Hewlett-Packard Advisory  ]

Document ID:  HPSBUX9810-086
Date Loaded:  19981027
      Title:  Security Vulnerability with SharedX

- -------------------------------------------------------------------------
    HEWLETT-PACKARD COMPANY SECURITY BULLETIN: #00086, 28 October 1998
- -------------------------------------------------------------------------

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:  The SharedX program recserv is vulnerable to a denial of
          service attack.

PLATFORM:  HP 9000 series 700/800.

DAMAGE:    Excessive cpu usage.

SOLUTION:  Install the patches listed below.

AVAILABILITY:  All patches are available now.

- -------------------------------------------------------------------------
I.
   A. Background
      HP SharedX Receiver Service (recserv) provides a method for a
      receiver to allow the sharing of windows without explicitly
      performing any xhost commands.  The Internet daemon, inetd,
      executes recserv when it receives a service request at the port
      listed in the services database.  Certain messages to the port
      can cause recserv to enter a tight processing loop

   B. Fixing the problem - Install the applicable patch:

         HP-UX revision 10.01  HP9000 Series 7/800   PHSS_16646
         HP-UX revision 10.10  HP9000 Series 7/800   PHSS_16647
         HP-UX revision 10.20  HP9000 Series 7/800   PHSS_16648
         HP-UX revision 11.00  HP9000 Series 7/800   PHSS_16649

      Note - For HP-UX revisions prior to 10.01, update to 10.X,
             or 11.X and install the applicable patch.

   C. To subscribe to automatically receive future NEW HP Security
      Bulletins from the HP Electronic Support Center via electronic
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      Use your browser to get to the HP Electronic Support Center page
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      Login with your user ID and password (or register for one).
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      The security patch matrix is also available via anonymous ftp:

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      ~ftp/export/patches/hp-ux_patch_matrix

   D. To report new security vulnerabilities, send email to

       security-alert@hp.com

      Please encrypt any exploit information using the security-alert
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     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
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________________________________________________________________________

- -----End of Document ID:  HPSBUX9810-086--------------------------------------


[  End Hewlett-Packard Advisory  ]
______________________________________________________________________________

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


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