AUSCERT External Security Bulletin Redistribution

       Potential Security Vulnerability in xdrmem_getbytes() (rev.6)
                               24 July 2003


        AusCERT Security Bulletin Summary

Product:                XDR Library
Publisher:              Hewlett-Packard
Operating System:       HP-UX 11.22
                        HP-UX 11.11
                        HP-UX 11.04
                        HP-UX 10.20
Platform:               HP9000 Series 700/800
Impact:                 Execute Arbitrary Code/Commands
                        Denial of Service
Access Required:        Remote
CVE Names:              CAN-2003-0028

Ref:                    AL-2003.03

- --------------------------BEGIN INCLUDED TEXT--------------------

Hash: SHA1

**REVISED 06**
 Originally issued: 19 March 2003
 Last revised: 22 July 2003
 SSRT2439 Potential Security Vulnerability in xdrmem_getbytes()

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: Potental buffer overflow in xdrmem_getbytes() and
         related functions.

IMPACT: Potential unauthorized access, denial of service.

PLATFORM: HP-UX B.10.20, B.11.00, B.11.04, B.11.11, and B.11.22

SOLUTION: Until patches are available manually install the
          appropriate fixed libraries.  Preliminary patches
          are now available for B.11.00 and B.11.11 which
          eliminate the manual installation of all but libc.1.
          PHNE_28567(B.11.00) and PHNE_28568(B.11.11) provide a
          partial solution.  Please refer to the note below.

 -->      B.10.20 - PHCO_26158

                Download and install the appropriate files.

AVAILABILITY:  The files are available now.  This bulletin will
               be revised when patches are available.

CHANGE SUMMARY: Rev.01 - Corrected instructions for replacing
                         libc.1 on 11.00 and 11.11.
                         Added CERT CA-2003-10 reference.
                Rev.02 - Corrected instructions 10.20
                Rev.03 - Patches are available for 11.00 and 11.11
                         libc.1 must still be manually installed
                         for 11.00 and 11.11
                Rev.04 - Corrected 11.00 and 11.11 patch
                Rev.05 - Added note about general release patches
                Rev.06 - Added PHCO_26158.
                         Added AFFECTED VERSIONS section.

 A. Background

    There are potential buffer overflows in
    xdrmem_getbytes() and related functions.

    This issue has been reported by CERT/CC in
    advisory CA-2003-10.

    The files listed below also have the fix for
    SSRT2336 Security Vulnerability in XDR library
    This bulletin should be implemented instead of


    The general release patches PHNE_28567 (B.11.00) and
    PHNE_28568 (B.11.11) contain the fix for some of the
    functions which are vulnerable.  The preliminary patches
    PHNE_28929(B.11.00) and PHNE_28930 (B.11.11) contain the fix
    for all the affected routines.  The routines fixed in
    PHNE_28567 and PHNE_28568 are thought to be more commonly
    used than the additional routines fixed in PHNE_28929 and
    PHNE_28930.  PHNE_28567 and PHNE_28567 are available now from
    <http://itrc.hp.com>.  If it is not possible to install
    preliminary patches there is some benefit to installing
    PHNE_28567 and PHNE_28568.

    HP Tru64 UNIX/TruCluster Servers:
    The following potential security vulnerability has been
    identified or reported in the HP Tru64 UNIX operating system
    that may result in unauthorized Privileged Access or a
    Denial of Service (DoS).
    This potential vulnerability may be in the form of Local
    and Remote security domain risks.

    Cross reference: SSRT2322, SSRT2384, SSRT2341,

    Not Impacted:

      HP NonStop Servers
      HP OpenVMS

 --> The following is a list by HP-UX revision of
 --> affected filesets and the fileset revision or
 --> patch containing the fix.  To determine if a
 --> system has an affected version, search the
 --> output of "swlist -a revision -l fileset"
 --> for an affected fileset, then determine if
 --> a fixed revision or the applicable patch is
 --> installed.
 --> HP-UX B.11.22
 --> =============
 --> fix: libnsl.so.1.64_11.22IA
 --> fix: libnsl.so.1.32_11.22IA
 --> fix: install libc.1 as described below
 --> HP-UX B.11.11
 --> =============
 --> fix: PHNE_28930.depot
 --> fix: install libc.1 as described below
 --> HP-UX B.11.04
 --> =============
 --> fix: libnsl.1.64_11.00, libnsl.a.64_11.00
 --> fix: libnsl.1.32_11.00, libnsl.a.32_11.00
 --> fix: install libc.1 as described below
 --> HP-UX B.11.00
 --> =============
 --> fix: PHNE_28929.depot
 --> fix: install libc.1 as described below
 --> HP-UX B.10.20
 --> =============
 --> fix: PHCO_26158 or subsequent

 B. Recommended solution

    Until patches are released, download and manually install
    the appropriate libraries and preliminary patches.

     System:           hprc.external.hp.com  (
     Login:            xdr2
     Password:         xdr2

     Browser ftp access:


        Note: There is an ftp defect in IE5 that may result in
               a browser hang.  To work around this:
        Select Tools -> Internet Options -> Advanced
        Un-check the option: [ ] Enable folder view for FTP sites

         If you wish to verify the md5 sum please refer to:

               Patch sums and the MD5 program

     Download the appropriate files and unpack with gunzip:

        libc.1.gz            # B.11.00, B.11.04, B.11.11, B.11.22
        PHNE_28929.depot.gz  # B.11.00
        PHNE_28929.text.gz   # B.11.00
        PHNE_28930.depot.gz  # B.11.11
        PHNE_28930.text.gz   # B.11.11
        libnsl.1.32_11.00.gz # B.11.04
        libnsl.a.32_11.00.gz # B.11.04
        libnsl.1.64_11.00.gz # B.11.04
        libnsl.a.64_11.00.gz # B.11.04
        libnsl.so.1.32_11.22IA.gz # B.11.22
        libnsl.so.1.64_11.22IA.gz # B.11.22

      Verify the cksum or md5.

         If you wish to verify the md5 sum please refer to:

               Patch sums and the MD5 program

      2405289836 8478720 PHNE_28929.depot
      3587776374 220723 PHNE_28929.text
      1995688196 7761920 PHNE_28930.depot
      1940563530 126042 PHNE_28930.text
      3108550729 1867776 libc.1
      2543748420 679936 libnsl.1.32_11.00
      3883898582 652664 libnsl.1.64_11.00
      2393869471 818268 libnsl.a.32_11.00
      205723668 1456024 libnsl.a.64_11.00
      2149197207 1490400 libnsl.so.1.32_11.22IA
      755476395 1565336 libnsl.so.1.64_11.22IA

 MD5 (PHNE_28929.depot) = 27dbd58c15b07c1a725246f9c569ef15
 MD5 (PHNE_28929.text) = 2d04406687c627125c125182529958ae
 MD5 (PHNE_28930.depot) = 5af99e5f733a8ef639ef0ae36f6533d5
 MD5 (PHNE_28930.text) = 0a2597f08dfc01db7c501b2ed91579f0
 MD5 (libc.1) = 118ce482dbb3982b7484ddc434d77a51
 MD5 (libnsl.1.32_11.00) = a6bbfcae4a7044b0d1e9aece871c126e
 MD5 (libnsl.1.64_11.00) = b3c76866d75a4216be7787f219c051df
 MD5 (libnsl.a.32_11.00) = 1c0aea725173673eb1c8e9410180096c
 MD5 (libnsl.a.64_11.00) = 06c8fd367c7620a017e9bb2e7df3ec7d
 MD5 (libnsl.so.1.32_11.22IA) = 6da4151346312058269645856e16ac89
 MD5 (libnsl.so.1.64_11.22IA) = f5f89dd00c66d03d7e14a72232c86f25

      For B.11.04
      #DIR=[path to new files]
      #cd /usr/lib

      #cp $DIR/libnsl.1.32_11.00 libnsl.1.new
      #cp $DIR/libnsl.a.32_11.00 libnsl.a.new
      #cp $DIR/libc.1 libc.1.new

      #chmod 555 libnsl.1.new
      #chmod 444 libnsl.a.new
      #chmod 555 libc.1.new

      #chown bin:bin libnsl.1.new
      #chown bin:bin libnsl.a.new
      #chown bin:bin libc.1.new

      #mv libnsl.1 libnsl.1.orig
      #mv libnsl.a libnsl.a.orig
      #mv libc.1 libc.1.orig

      #mv libnsl.1.new libnsl.1
      #mv libnsl.a.new libnsl.a
      #mv libc.1.new libc.1

      #cd /usr/lib/pa20_64

      #cp $DIR/libnsl.1.64_11.00 libnsl.1.new
      #cp $DIR/libnsl.a.64_11.00 libnsl.a.new

      #chmod 555 libnsl.1.new
      #chmod 444 libnsl.a.new

      #chown bin:bin libnsl.1.new
      #chown bin:bin libnsl.a.new

      #mv libnsl.1 libnsl.1.orig
      #mv libnsl.a libnsl.a.orig

      #mv libnsl.1.new libnsl.1
      #mv libnsl.a.new libnsl.a

      After this, any applications that use libnsl.1 must be
      restarted.  Any applications that use libnsl.a must
      be relinked and restarted.
      Any applications that use libc.1 must be restarted.

      Rebooting is the recommended way to restart the applications
      using libnsl.1 or libc.1.

      For B.11.00 and B.11.11
      Install the appropriate preliminary patch

      PHNE_28929.depot          #B.11.00
      PHNE_28930.depot          #B.11.11

      Install libc.1 as follows:

      #DIR=[path to new files]
      #cd /usr/lib
      #cp $DIR/libc.1 libc.1.new
      #chmod 555 libc.1.new
      #chown bin:bin libc.1.new
      #mv libc.1 libc.1.orig
      #mv libc.1.new libc.1

      After this, any applications that use libnsl.1 must be
      restarted.  Any applications that use libnsl.a must
      be relinked and restarted.

      Rebooting is the recommended way to restart the applications
      using libnsl.1 or libc.1.

      For B.11.22 IA
      #DIR=[path to new files]
      #cd /usr/lib/hpux32
      #cp $DIR/libnsl.so.1.32_11.22.IA libnsl.so.1.new
      #chmod 555 libnsl.so.1.new
      #chown bin:bin libnsl.so.1.new
      #mv libnsl.so.1 libnsl.so.1.orig
      #mv libnsl.so.1.new libnsl.so.1

      #cd /usr/lib
      #cp $DIR/libc.1 libc.1.new
      #chmod 555 libc.1.new
      #chown bin:bin libc.1.new
      #mv libc.1 libc.1.orig
      #mv libc.1.new libc.1

      #cd /usr/lib/hpux64
      #cp $DIR/libnsl.so.1.64_11.22.IA libnsl.so.1.new
      #chmod 555 libnsl.so.1.new
      #chown bin:bin libnsl.so.1.new
      #mv libnsl.so.1 libnsl.so.1.orig
      #mv libnsl.so.1.new libnsl.so.1

      After this, any applications that use libnsl.so.1 must be

      Rebooting is the recommended way to restart the applications
      using libnsl.1 or libc.1.

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(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 Personal Security 7.0.3


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