AUSCERT External Security Bulletin Redistribution

      SSRT2316 Sec. Vulnerability in DNS and resolver lib's (rev.10)
                               16 April 2003


        AusCERT Security Bulletin Summary

Product:                DNS Resolver Libraries
Vendor:                 Hewlett-Packard
Operating System:       HP-UX 10.10
                        HP-UX 10.20
                        HP-UX 10.24
                        HP-UX 11.00
                        HP-UX 11.04
                        HP-UX 11.11
Platform:               HP9000 Series 700/800
Impact:                 Execute Arbitrary Code/Commands
                        Denial of Service
Access Required:        Remote
CVE Names:              CAN-2002-0651, CAN-2002-0684

Ref:                    ESB-2003.0131

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Hash: SHA1

 **REVISED 10**
 Originally issued: 12 August 2002
 Last revised: 14 April 2003
 SSRT2316 Sec. Vulnerability in DNS and resolver lib's (rev.10)

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: 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, Bind 9.x, Bind-8.1.2,
          and libnss_dns.
          HP9000 Series 700/800 running HP-UX release 10.20
          HP9000 Series 700/800 running HP-UX release 10.10
          HP9000 Series 700/800 running HP-UX release 10.24
          or 11.04 (VVOS)

IMPACT: Potential unauthorized access, denial of service.

SOLUTION: Until a product upgrade is available, download and
          install appropriate preliminary updates and the
          appropriate preliminary or final patches.

                Install the applicable upgrades and patches
                listed in the "Recommended solutions"
                section (below).

**REVISED 10**
AVAILABILITY:  The depots are available now.
               BIND9.2.0 is available now. (11.11)
               BIND-920 is available now. (11.00)
               BIND812 is available now. (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_27882 for 10.24 (VVOS)
 -->>            PHNE_27795 for 11.00
 -->>            PHNE_28450 for 11.11.
               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
                Rev.02 -  A patch was incorrectly listed,
                          PHNE_27647.depot is the correct number.
                          New version available,
                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.
                Rev.06 -  Corrected "strings" to "strings -a"
                Rev.07 -  Added 11.04 and 10.24 information.
                Rev.08 -  BIND9.2.0 version
                          Updated to latest patches.
                          Added 10.10 information.
                Rev.09 -  BIND812 version B.
                          BIND-920 version B.
                          Added PHNE_27796 for 11.11.
                          Removed PHNE_27647.depot for 11.11.
                          Clarified 10.10 information.
                          Added CERT VU#738331 information.
                Rev.10 -  Added PHNE_27795 for 11.00.
                          Removed PHNE_27646.depot for 11.00.
                          Added PHNE_28450 for 11.11.
                          Removed PHNE_27794.depot for 11.11.
                          Added note that both client and server
                          systems are affected.

 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 Bind 9.x.  This bulletin will be
    updated when solutions for other vulnerable products are
    CERT VU#738331 is fixed by the patches referenced below.
    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.
    HP-UX 10.10 programs calling the DNS API are vulnerable.

**REVISED 10**
 -> Note: These fixes should be applied to all systems using
 ->       DNS, including those systems with client programs only.
 B. Recommended solution

     The following preliminary fixes are available:

      HP-UX 10.10

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

      HP-UX 10.20

       PHNE_27792.depot s700_800 10.10/10.20 Bind 4.9.7 components
       PHCO_26152.depot s700_800 10.20 libc

     HP-UX 10.24

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

      HP-UX 11.00

**REVISED 10**
       BIND812 version B.  or
       subsequent from http://software.hp.com.
       BIND-920 version B. or
       subsequent from http://software.hp.com.
       PHNE_27793.depot s700_800 11.00 Bind 4.9.7 components

 -->>  PHNE_27795 s700_800 11.00 libnss_dns

      HP-UX 11.04

       PHNE_28415 s700_800 11.04 (VVOS) Bind 4.9.7 components
       PHNE_27881.depot s700_800 11.04 (VVOS) libnss_dns

      HP-UX 11.11

       BIND9.2.0 version or
       subsequent from http://software.hp.com.
 -->>  PHNE_28450 s700_800 11.11 Bind-8.1.2 patch

       PHNE_27796 s700_800 11.11 libnss_dns

     Note: BIND9.2.0 version also corrects
           potential problems reported in CERT advisory

    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  (
        Login:     bind
        Password:  bind1

        FTP Access: ftp://bind:bind1@hprc.external.hp.com/
                or: ftp://bind:bind1@
        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
      PHCO_26152.depot s700_800 10.20 libc patch
      PHNE_27879.depot s700_800 10.24 (VVOS) BIND 4.9.7 components
      PHNE_27793.depot s700_800 11.00 Bind 4.9.7 components
      PHNE_28415 s700_800 11.04 (VVOS) Bind 4.9.7 components
      PHNE_27881.depot s700_800 11.04 (VVOS) libnss_dns

     Note: If you wish to verify the md5 sum and you do not
           have a copy of md5, please refer to:
               Patch sums and the MD5 program
     Note: Using your itrc account security bulletins can be
          found here:

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

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

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

     MD5 (PHNE_27793.depot) = 6f0f0f34c7a51688f6506c56da636689
     cksum 4222745255 675840 PHNE_27793.depot

     MD5 (PHNE_28415) = b07cd934bdcac2bf9cdfcbb2b44644de
     cksum 1939013995 973906 PHNE_28415

     MD5 (PHNE_27881.depot) = d53a774092f72e98cb62607b5882b576
     cksum 1828722320 61440 PHNE_27881.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.

**REVISED 09**
    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 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.

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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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