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TUCoPS :: HP/UX :: ciacj026.txt

HP-UX Rpc Pcnfsd Vulnerability



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

                             INFORMATION BULLETIN

                         HP-UX rpc.pcnfsd Vulnerability

February 10, 1999 17:00 GMT                                       Number J-026
PROBLEM:       Hewlett-Packard has identified a vulnerability in the
               rpc.pcnfsd which is used in the spool directory.
PLATFORM:      HP 9000 series 700/800.
DAMAGE:        If exploited, remote and local users could gain root access.
SOLUTION:      Apply patches and reboot.
VULNERABILITY  Risk is high. If exploited, this defect could allow the main
ASSESSMENT:    printer spool directory to be made world writeable.
               Hewlett-Packard recommends that the patches be applied as soon
               as possible.

[  Start Hewlett-Packard Advisory  ]

Document ID:  HPSBUX9902-091
Date Loaded:  19990207
      Title:  Security Vulnerability with rpc.pcnfsd

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

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:  rpc.pcnfsd has an error in its use of the spool directory

PLATFORM: HP 9000 series 700/800.

DAMAGE:   Remote and local users can compromise root access.

SOLUTION: Install _all_ applicable patches listed below.  Reboot required.

AVAILABILITY:  All patches are available now.

- -------------------------------------------------------------------------
   A. Background
      rpc.pcnfsd is a remote procedure call used by NFS clients which is
      a service providing username and password authentication for system
      which have NFS client software installed.
      If exploited, this defect allows the main printer spool directory
      used by rpc.pcnfsd to be made world writeable.

   B. Fixing the problem
      This involves installing a series of patches which require
      rebooting the system.  The main patch requires a libc patch,
      which in turn requires a kernal patch.

        For HP-UX 10.01:                        PHNE_17248
        For HP-UX 10.10:                        PHNE_17248
        For HP-UX 10.20:                        PHNE_17098
        For HP-UX 11.00:                        PHNE_16470

      The following sets of patches will need to be installed to resolve
      all the documented patch dependencies.  The dependencies will be
      satisfied by the patches listed, or any patch that supersedes them:

        s700 10.01:     PHNE_17248, PHKL_7059,  PHCO_14253;
        s800 10.01:     PHNE_17248, PHKL_7060,  PHCO_14253;
        s700 10.10:     PHNE_17248, PHKL_8292,  PHCO_14254;
        s800 10.10:     PHNE_17248, PHKL_8293,  PHCO_14254;
        s700 10.20:     PHNE_17098, PHKL_9155,  PHKL_16750,
                        PHCO_13777, PHCO_12922, PHCO_17389,
                        PHNE_16237, PHKL_16959, PHKL_17012,
                        PHKL_17253, PHKL_12007;
        s800 10.20:     PHNE_17098, PHKL_9156,  PHKL_16751,
                        PHCO_13777, PHCO_12922, PHCO_17389,
                        PHNE_17097, PHKL_16957, PHKL_17013,
                        PHKL_17254, PHKL_12008;
        s700 11.00:     PHNE_16470, PHCO_16629, PHKL_15689,
        s800 11.00:     PHNE_16470, PHCO_16629, PHKL_15689,

      NOTE: This problem is fixed fully in HP-UX release 11.01.

   C. To subscribe to automatically receive future NEW HP Security
      Bulletins from the HP Electronic Support Center via electronic
      mail, do the following:

      Use your browser to get to the HP Electronic Support Center page
               (for US, Canada, Asia-Pacific, & Latin-America)     (for Europe)

      Login with your user ID and password (or register for one).
      Remember to save the User ID assigned to you, and your password.
      Once you are in the Main Menu:
      To -subscribe- to future HP Security Bulletins,
        click on "Support Information Digests".
      To -review- bulletins already released from the main Menu,
        click on the "Search Technical Knowledge Database."

      Near the bottom of the next page, click on "Browse the HP
      Security Bulletin Archive".
      Once in the archive there is another link to our current Security
      Patch Matrix.  Updated daily, this matrix categorizes security
      patches by platform/OS release, and by bulletin topic.

      The security patch matrix is also available via anonymous ftp:

   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

     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.
- -----End of Document ID:  HPSBUX9902-091--------------------------------------

[  End Hewlett-Packard Advisory  ]

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
    FAX:      +1 925-423-8002
    STU-III:  +1 925-423-2604

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Previous CIAC notices, anti-virus software, and other information are
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   World Wide Web:
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   Anonymous FTP:
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                        +1 (925) 423-3331 (28.8K baud)

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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
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