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SSRT2316 Potential Security Vulnerability in DNS and resolver lib's (rev.15)
HPSBUX0208-209
Published: 2003-09-02 10:57:21
Updated: 2003-09-02 10:57:21

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 **REVISED 15**
 Source: HEWLETT-PACKARD COMPANY
 SECURITY BULLETIN: HPSBUX0208-209
 Originally issued: 12 August 2002
 Last revised: 02 September 2003
 SSRT2316 Potential Security Vulnerability in DNS
          and resolver lib's (rev.15)
 -----------------------------------------------------------------

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: Potential buffer overflows in DNS resolver libraries.

PLATFORM: HP-UX releases B.10.10, B.10.20, B.10.24 (VVOS),
          B.11.00, B.11.04 (VVOS), B.11.11 and B.11.22.

IMPACT: Potential unauthorized access, denial of service.

**REVISED 15**
SOLUTION: Until a product upgrade is available, download and
          install appropriate preliminary updates and the
          appropriate preliminary or final patches.
          The following patches are available from the itrc:
                 PHCO_26158 for B.10.20
                 PHCO_27882 for B.10.24 (VVOS)
                 PHNE_27795 for B.11.00
                 PHNE_28449 for B.11.00
                 PHNE_27881 for B.11.04 (VVOS)
 -->             PHNE_29634 for B.11.04 (VVOS)
                 PHNE_27796 for B.11.11
                 PHNE_28450 for B.11.11
                 PHNE_28490 for B.11.22


MANUAL ACTIONS: Yes - NonUpdate
                Install the applicable upgrades and patches
                listed in the "Recommended solutions"
                section (below).

AVAILABILITY:  The depots are available now.
               BIND9.2.0 is available now. (for B.11.11)
               BIND-920 is available now. (for B.11.00)
               BIND812 is available now. (for B.11.00)
               The preliminary patches (depot files) are
               available only from the ftp site (below) at
               this time.
               The following are available from the itrc:
                 PHCO_26158 for B.10.20
                 PHCO_27882 for B.10.24 (VVOS)
                 PHNE_27795 for B.11.00
                 PHNE_28449 for B.11.00
                 PHNE_27881 for B.11.04 (VVOS)
 -->             PHNE_29634 for B.11.04 (VVOS)
                 PHNE_27796 for B.11.11
                 PHNE_28450 for B.11.11
                 PHNE_28490 for B.11.22
               This bulletin will be updated when a
               product upgrade is available. This bulletin
               will also be updated when solutions for
               other vulnerable products are available.

CHANGE SUMMARY: Rev.01 -  Added Bind-8.1.2. and libnss_dns
                          information.
                Rev.02 -  A patch was incorrectly listed,
                          PHNE_27647.depot is the correct number.
                          New version available,
                           BIND920ver3.depot.
                Rev.03 -  Added Bind-4.9.7 info. for B.11.00.
                Rev.04 -  Added Bind-4.9.7 info. for B.10.20.
                Rev.05 -  Added libc information for B.10.20.
                Rev.06 -  Corrected "strings" to "strings -a"
                Rev.07 -  Added B.11.04 and B.10.24 info.
                Rev.08 -  BIND9.2.0 version 11.11.2.0.200209.
                          Updated to latest patches.
                          Added B.10.10 information.
                Rev.09 -  BIND812 version B.11.00.01.004.
                          BIND-920 version B.11.00.01.001.
                          Added PHNE_27796 for B.11.11.
                          Removed PHNE_27647.depot for B.11.11.
                          Clarified 10.10 information.
                          Added CERT VU#738331 information.
                Rev.10 -  Added PHNE_27795 for B.11.00.
                          Removed PHNE_27646.depot for B.11.00.
                          Added PHNE_28450 for B.11.11.
                          Removed PHNE_27794.depot for B.11.11.
                          Added note that both client and server
                          systems are affected.
                Rev.11 -  Clarified that BIND9.2.0 version
                          11.11.01.002 is subsequent to
                          11.11.2.0.200209.
                          Added CERT VU#852283 and VU#229595
                          Added discussion of vulnerable
                          B.11.00 and B.11.11 versions.
                          Added CAUTION note about switching
                          between web upgrade and base os
                          versions of bind.
                          Added AFFECTED VERSIONS section.
                          Added B.11.22 information.
                Rev.12 -  Added PHNE_27881 for B.11.04.
                          Added PHCO_26158 for B.10.20.
                Rev.13 -  Added PHNE_28490 for B.11.22.
                Rev.14 -  Added PHNE_28449 for B.11.00.
                Rev.15 -  Added PHNE_29634 for B.11.04.
                          Removed PHNE_28415 for B.11.04.
 -----------------------------------------------------------------
 A. Background

     CERT advisory CA-2002-19, CERT VU#738331, CERT VU#852283, and
     CERT VU#229595 report vulnerabilities which may affect
     products on HP-UX and VVOS.

    Note: These fixes should be applied to all systems using
          DNS, including those systems with client programs only.

     Notes on Bind Versions (B.11.00 and B.11.11)
     =============================================

     Bind is available on B.11.00 and B.11.11 as part of
     the base operating system and as a web upgrade.
     Both versions (base os and web upgrade) may be
     installed on a system simultaneously.  Only one
     version can be active.  The active version can
     be changed via a script.

     The base os versions are updated via patches.  The
     web upgrade versions are updated by installing a
     later web upgrade.  The web upgrade versions are
     not patched.

     If a web upgrade version is active it is not possible
     to patch the base os version.  It is necessary to
     switch to the base os version with the following
     command before applying the patch:

       /usr/bin/enable_inet -r bind

     If you are running a web upgrade version and do not
     intend to re-enable the base os version, it is not
     necessary to patch the base os version.  However,
     since the base os version can be re-enabled with
     the script, you may want to patch the base os version
     even though it is not active.  Similarly, if you have
     installed a web upgrade version and have switched
     back to the base os version, you may want to update
     to the latest web upgrade version or use swremove(1)
     to remove the web upgrade version entirely.

     Identifying the Active Version (B.11.00/B.11.11)
     ================================================

     Execute the following command:

        what /usr/sbin/named | grep named

     The bind version will be on the named line.
     For example:

         named 9.2.0 Thu Jul 18 11:58:39 GMT 2002


     Identifying the Web Upgrade Version (B.11.00/B.11.11)
     =====================================================

     If the file /usr/contrib/bind/usr/sbin/named exists,
     execute the following:

        what /usr/contrib/bind/usr/sbin/named | grep named

     The bind version will be on the named line.

     AFFECTED VERSIONS

     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
     =============
     InternetSrvcs.INETSVCS2-RUN
     fix: PHNE_28490 or subsequent

     NFS.NFS-SHLIBS
     NFS.NFS-64SLIB
     fix: PHNE_27842.depot

     HP-UX B.11.11
     =============
     BINDv913.INETSVCS-BIND
     fix: must upgrade

     bind.INETSVCS-RUN
     fix: must upgrade

     BINDv920.INETSVCS-BIND
     fix: revision B.11.11.01.002 or subsequent

     InternetSrvcs.INETSVCS-RUN
     fix: PHNE_28450 or subsequent

     NFS.NFS-SHLIBS
     NFS.NFS-64SLIB
     fix: PHNE_27796 or subsequent

**REVISED 15**
     HP-UX B.11.04
     =============
     InternetSrvcs.INETSVCS-RUN
 --> fix: PHNE_29634 or subsequent

     NFS.NFS-64SLIB
     NFS.NFS-SHLIBS
     fix: PHNE_27881 or subsequent

     HP-UX B.11.00
     =============
     BINDv812.INETSVCS-BIND
     fix: revision B.11.00.01.004 or subsequent

     BINDv920.INETSVCS-BIND
     fix: revision B.11.00.01.001 or subsequent

     bind.INETSVCS-RUN
     fix: must upgrade

     upgrade_bind812.INETSVCS-RUN
     fix: must upgrade

     BINDv913.INETSVCS-BIND
     fix: must upgrade

     InternetSrvcs.INETSVCS-RUN
     fix: PHNE_28449 or subsequent

     NFS.NFS-SHLIBS
     NFS.NFS-64SLIB
     fix: PHNE_27795 or subsequent

     HP-UX B.10.24
     =============
     InternetSrvcs.INETSVCS-RUN
     fix: PHNE_27879.depot

     OS-Core.C-MIN
     OS-Core.CORE-SHLIBS
     ProgSupport.PROG-AUX
     ProgSupport.PROG-MIN
     fix: PHCO_27882 or subsequent

     HP-UX B.10.20
     =============
     InternetSrvcs.INETSVCS-RUN
     fix: PHNE_27792.depot

     OS-Core.C-MIN
     OS-Core.CORE-SHLIBS
     ProgSupport.PROG-MIN
     ProgSupport.PROG-AUX
     fix: PHCO_26158 or subsequent

     HP-UX B.10.10
     =============
     InternetSrvcs.INETSVCS-RUN
     fix: PHNE_27792.depot

     OS-Core.CORE-SHLIBS
     fix: libc.1.1010, libc.a.1010

     END AFFECTED VERSIONS

     Note:  The Security Patch Check tool examines patches to
            determine whether a system is vulnerable.  Therefore,
            if the base o/s version of bind is not patched
            as described in this bulletin, the Security Patch
            Check tool will report that fact even if the
            web upgrade version is active.  The Security
            Patch Check tool will not examine the web upgrade
            versions of bind.

 B. Recommended solution

     CAUTION: If you have installed a web upgrade, the Base OS
              version remains on the system.  This command:
                 "/usr/bin/enable_inet -r bind"
              restores the Base OS version.  The Base OS version
              cannot be patched while the web upgrade version is
              enabled.  After reverting to the Base OS version
              you should verify that it is properly patched as
              described below.

     The following preliminary fixes are available:

      HP-UX B.10.10
      =============

       PHNE_27792.depot s700_800 10.10/10.20 Bind 4.9.7 components
         AND
       libc.1.1010, libc.a.1010 10.10 libc files


      HP-UX B.10.20
      =============

       PHNE_27792.depot s700_800 10.10/10.20 Bind 4.9.7 components
         AND
       PHCO_26158 s700_800 10.20 libc

     HP-UX B.10.24
     =============

      PHNE_27879.depot s700_800 10.24 (VVOS) BIND 4.9.7 components
         AND
      PHCO_27882: s700_800 10.24 (VVOS) libc

     HP-UX B.11.00 Bind 9.2.0
     ========================

       BIND-920 version B.11.00.01.001 or subsequent
       from http://software.hp.com.
          AND
      PHNE_27795 s700_800 11.00 libnss_dns

     HP-UX B.11.00 Bind 8.1.2
     ========================

       BIND812 version B.11.00.01.004  or subsequent
       from http://software.hp.com.
          AND
      PHNE_27795 s700_800 11.00 libnss_dns

     HP-UX B.11.00 Bind 4.9.7
     ========================

      PHNE_28449 s700_800 11.00 Bind 4.9.7 components
          AND
      PHNE_27795 s700_800 11.00 libnss_dns

**REVISED 15**
     HP-UX B.11.04
     =============

 -->   PHNE_29634 s700_800 11.04 (VVOS) Bind 4.9.7 components
         AND
       PHNE_27881 s700_800 11.04 (VVOS) libnss_dns DNS backend

     HP-UX B.11.11 Bind 9.2.0
     ========================
       BIND9.2.0 version 11.11.2.0.200209 or subsequent
       from http://software.hp.com.
       Note: 11.11.01.002 is subsequent to 11.11.2.0.200209.
             However, in order to install 11.11.01.002
             on a system with 11.11.2.0.200209, the
             "-x allow_downdate=true" option to swinstall
             must be used.
          AND
       PHNE_27796 s700_800 11.11 libnss_dns

     Note: BIND9.2.0 version 11.11.2.0.200209 also corrects
           potential problems reported in CERT advisory
           CA-2002-23.

     HP-UX B.11.11 Bind 8.1.2
     ========================

       PHNE_28450 s700_800 11.11 Bind-8.1.2 patch
          AND
       PHNE_27796 s700_800 11.11 libnss_dns

     HP-UX B.11.22
     =============

     PHNE_28490 s700_800 11.22 Bind 9.2.0 components
          AND
     PHNE_27842.depot s700_800 11.22 libnss_dns DNS backend patch



    Note: The files mentioned below can be downloaded from
          the following site.  This site is temporary and
          will be removed when the fixes become available
          from the itrc.

        System:    hprc.external.hp.com  (192.170.19.51)
        Login:     bind
        Password:  bind1

        FTP Access: ftp://bind:bind1@hprc.external.hp.com/
                or: ftp://bind:bind1@192.170.19.51/
        file: upgrade_bind812_v4.depot.gz

        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


    Download and install the appropriate preliminary patch
    from the ftp site listed above:

      PHNE_27792.depot s700_800 10.10/10.20 Bind 4.9.7 components
      Note: PHNE_27792 is also available as as site specific patch
            from HP Response Centers.
      PHNE_27879.depot s700_800 10.24 (VVOS) BIND 4.9.7 components
      PHNE_27842.depot s700_800 11.22 libnss_dns DNS backend patch


     Note: If you wish to verify the md5 sum and you do not
           have a copy of md5, please refer to:
               HPSBUX9408-016
               Patch sums and the MD5 program
     Note: Using your itrc account security bulletins can be
          found here:
     http://itrc.hp.com/cki/bin/doc.pl/screen=ckiSecurityBulletin


     MD5 (PHNE_27792.depot) = 613aa5827f0b4df4f51188857b5834d0
     cksum 4143672841 696320 PHNE_27792.depot

     MD5 (PHNE_27879.depot) = 90a570964b5cf48dadcd427f69bfdd16
     cksum 2889539873 747520 PHNE_27879.depot

     MD5 (PHNE_27842.depot) = 79958aa9fdd13614c0564ef60e121ba9
     cksum 73665367 266240 PHNE_27842.depot


     Note: On 10.10 and 10.20 the DNS API is contained in libc.
           Programs which make DNS calls and are linked with
           libc.a must be relinked.
           Programs which are linked with ".a" libraries
            are statically linked.
           Statically linked programs may be tested as follows:

      strings -a suspect_program | grep "Too many addresses (%d)"

           If the program contains the string it may make
           DNS API calls and should be relinked with the
           fixed version of libc.a.

    Download libc.1.1010 and libc.a.1010 from the ftp
    site mentioned above.

     MD5 (libc.1.1010) = 87be3ba33250be16ad39345ed38f9875
     cksum 1642516484 1716224 libc.1.1010
     MD5 (libc.a.1010) = b680e1861a4b3ea4fc8fe55da63d62d2
     cksum 4179986886 2280612 libc.a.1010

     Install on B.10.10 as follows:


           1. Go to init state 2.  Copy libc.1.1010 and
              libc.a.1010 to a secure directory such as /.

           2. cd /usr/lib
              /usr/sbin/cp libc.1 libc.1.orig
              /usr/sbin/cp /libc.1.1010 libc.1
              /usr/sbin/cp libc.a libc.a.orig
              /usr/sbin/cp /libc.a.1010 libc.a

           3. Reboot the system.

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

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

    Use your browser to get to the HP IT Resource Center page
    at:

       http://itrc.hp.com

    Use the 'Login' tab at the left side of the screen to login
    using your ID and password.  Use your existing login or the
    "Register" button at the left to create a login, in order to
    gain access to many areas of the ITRC.  Remember to save the
    User ID assigned to you, and your password.

    In the left most frame select "Maintenance and Support".

    Under the "Notifications" section (near the bottom of
    the page), select "Support Information Digests".

    To -subscribe- to future HP Security Bulletins or other
    Technical Digests, click the check box (in the left column)
    for the appropriate digest and then click the "Update
    Subscriptions" button at the bottom of the page.

    or

    To -review- bulletins already released, select the link
    (in the middle column) for the appropriate digest.

    NOTE: Using your itrc account security bulletins can be
          found here:
    http://itrc.hp.com/cki/bin/doc.pl/screen=ckiSecurityBulletin


    To -gain access- to the Security Patch Matrix, select
    the link for "The Security Bulletins Archive".  (near the
    bottom of the page)  Once in the archive the third link is
    to the current Security Patch Matrix. Updated daily, this
    matrix categorizes security patches by platform/OS release,
    and by bulletin topic.  Security Patch Check completely
    automates the process of reviewing the patch matrix for
    11.XX systems.

    For information on the Security Patch Check tool, see:
    http://www.software.hp.com/cgi-bin/swdepot_parser.cgi/cgi/
    displayProductInfo.pl?productNumber=B6834AA

    The security patch matrix is also available via anonymous
    ftp:

    ftp://ftp.itrc.hp.com/export/patches/hp-ux_patch_matrix/

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

 D. To report new security vulnerabilities, send email to

    security-alert@hp.com

    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 security-alert@hp.com.

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

(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.

 ________________________________________________________________

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