AUSCERT External Security Bulletin Redistribution

           Sec. Vulnerability in DNS resolver libraries (rev. 5)
                             12 September 2002


        AusCERT Security Bulletin Summary

Product:                DNS Resolver Libraries
Vendor:                 Hewlett-Packard
Operating System:       HP-UX 10.20
                        HP-UX 11.00
                        HP-UX 11.11
Platform:               HP9000
Impact:                 Execute Arbitrary Code/Commands
                        Denial of Service
Access Required:        Remote

Ref:                    ESB-2002.473

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

Document ID:  HPSBUX0208-209
Date Loaded:  20020811
      Title:  Sec. Vulnerability in DNS resolver libraries (rev. 5)

 **REVISED 05**
 Originally issued: 12 Aug 2002
 Last revised: 11 Sept 2002
 SSRT2316 Security Vulnerability in DNS resolver libraries

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.

 **REVISED 05**
PLATFORM: HP9000 Series 700/800 running HP-UX releases 11.00 and
          11.11 (11i) with products using DNS resolver libraries,
          including, but not limited to, BINDv920.INETSVCS-BIND,
          Bind-8.1.2. and libnss_dns.
          HP9000 Series 700/800 running HP-UX release 10.20

DAMAGE: Potential unauthorized access, denial of service.

SOLUTION: Until a product upgrade is available, download and
          install the preliminary fix, BIND920ver3.depot.
          Download and install the preliminary versions of
          the applicable patch.

                Install BIND920ver3.depot. 
                Install upgrade_bind812_v4.depot on 11.00.
                Install preliminary patch.
- -->>            Relink statically linked programs calling the
- -->>            DNS API on 10.20.

AVAILABILITY:  The depot is available now.
               The preliminary patches are available only
               from the ftp site (below) at this time.
               This bulletin will be 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
                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 information for 11.00.
                Rev.04 -  Added Bind-4.9.7 information for 10.20.
                Rev.05 -  Added libc information for 10.20.
 **REVISED 05**
 A. Background
    CERT advisory CA-2002-19 reports a buffer overflow
    vulnerability which may affect products on HP-UX release
    11.00 and release 11.11 (11i).  The vulnerable products 
    include BINDv920.INETSVCS-BIND.  This bulletin will be
    updated when solutions for other vulnerable products are
    Bind-8.1.2 is vulnerable.
    The libnss_dns.1 library is vulnerable.
    Bind-4.9.7 is vulnerable.
- -->>HP-UX 10.20 programs calling the DNS API are vulnerable.

 B. Recommended solution

     The following preliminary fixes are available:

**REVISED 05**
      HP-UX 10.20

       PHNE_27762.depot s700_800 10.20 Bind 4.9.7 components
- -->>   PHCO_26152.depot s700_800 10.20 libc

      HP-UX 11.00

       upgrade_bind812_v4.depot for 11.00
       PHNE_27748.depot s700_800 11.00 Bind 4.9.7 components
       PHNE_27646.depot s700_800 11.00 libnss_dns

      HP-UX 11.11

       BIND920ver3.depot for 11.11
       PHNE_25140.depot s700_800 11.11 Bind-8.1.2 patch
       PHNE_27647.depot s700_800 11.11 libnss_dns

     Note: BIND920ver3.depot also corrects potential problems
           reported in CERT advisory CA-2002-23.

    I. Until a product upgrade is available, download and install
       the BIND920ver3.depot. 

      1. Download BIND920ver3.depot.gz from the ftp site.
         This file is temporary and will be deleted when a 
         product upgrade is available from itrc.hp.com.

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

        FTP Access: ftp://bind:bind1@hprc.external.hp.com/
                or: ftp://bind:bind1@
        file: BIND920ver3.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

      2. Copy the BIND920ver3.depot.gz file to a protected
         directory and unpack it.
         If you wish to verify the md5 sum please refer to:

               Patch sums and the MD5 program

          The md5 sum for BIND920ver3.depot is:

      MD5 (BIND920ver3.depot) = 0108336cd2d84adf71eafbbe8e133c36
          The cksum output is:

      251480612 20725760 BIND920ver3.depot

      3. Install BIND920ver3.depot using swinstall.

    II. Until a product upgrade is available, download and install
        the upgrade_bind812_v4.depot for 11.00.  The instructions 
        for BIND920ver3.depot above apply.

            file: upgrade_bind812_v4.depot.gz

            MD5 (upgrade_bind812_v4.depot) = 

            cksum upgrade_bind812_v4.depot
            330647597 1116160 upgrade_bind812_v4.depot

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

 **REVISED 05**
      PHNE_27762.depot s700_800 10.20 Bind 4.9.7 components
- -->>  PHCO_26152.depot s700_800 10.20 libc patch
      PHNE_27646.depot s700_800 11.00 libnss_dns DNS backend patch
      PHNE_27748.depot s700_800 11.00 Bind 4.9.7 components
      PHNE_27647.depot s700_800 11.11 libnss_dns DNS backend patch
      PHNE_25140.depot s700_800 11.11 Bind-8.1.2 patch

     MD5 (PHNE_27762.depot) = 8e30ef19ed590f2554e1c373a189cd99
     cksum 1419159559 696320 PHNE_27762.depot

- -->> MD5 (PHCO_26152.depot) = fbd411fb4ca5f392722415868ee8b6cb
- -->> cksum 2238979170 9676800 PHCO_26152.depot

     MD5 (PHNE_27646.depot) = f15f7f0dd5098b55df363007197b9fcb
     cksum 891782754 61440 PHNE_27646.depot

     MD5 (PHNE_27748.depot) = d71c42cba7af8b8dcf6301dee003ec9c
     3120592593 675840 PHNE_27748.depot

     MD5 (PHNE_27647.depot) = e110ecb2a69bd3b669f993c552e80c0c
     cksum 2185197379 102400 PHNE_27647.depot

     MD5 (PHNE_25140.depot) = 9c729b48c146dd636941b5a6a2e65ae1
     cksum 1959995259 655360 PHNE_25140.depot

- -->> Note: On 10.20 the DNS API is contained in libc.  Programs
- -->>       which make DNS calls and are linked with libc.a 
- -->>       must be relinked.  So far as is known HP delivers
- -->>       no such programs.  
- -->>       Programs which are linked with ".a" libraries
- -->>        are statically linked.
- -->>       Statically linked programs may be tested as follows:
- -->>
- -->>    strings 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.

 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


    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.


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

    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:

    The security patch matrix is also available via anonymous


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

 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 security-alert@hp.com.

    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:  HPSBUX0208-209--------------------------------------

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content.  The decision to use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the original authors to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:


If you believe that your system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business 
                hours which are GMT+10:00 (AEST).  On call after hours 
                for member emergencies only.

Version: 2.6.3i
Charset: noconv
Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key