SSRT2316 Sec. Vulnerability in DNS and resolver libraries (rev.8)

SSRT2316 Sec. Vulnerability in DNS and resolver libraries (rev.8)

Post by Security Ale » Fri, 20 Dec 2002 00:58:40

Hash: SHA1

 **REVISED 08**
 Originally issued: 12 Aug 2002
 Last revised: 18 Dec 2002
 SSRT2316 Security Vulnerability in DNS and resolver libraries

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.

 **REVISED 08**
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.

 **REVISED 08**
                Install the applicable upgrades and patches
                listed in the "Recommended solutions"
                section (below).

AVAILABILITY:  The depots are available now.
               BIND9.2.0 version is available now.
               PHCO_27882 for 10.24 (VVOS) is available
               now from the itrc.
               The preliminary patches (depot files) 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.
                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.

 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
    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.

 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

- -->>   BIND812_v4.depot for 11.00
- -->>   PHNE_27793.depot s700_800 11.00 Bind 4.9.7 components
       PHNE_27646.depot 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
- -->>   PHNE_27794.depot s700_800 11.11 Bind-8.1.2 patch
       PHNE_27647.depot s700_800 11.11 libnss_dns

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

- -->>I. Install BIND9.2.0 version or
- -->>   subsequent from

    II. Until a product upgrade is available, download and install
- -->>    the BIND812_v4.depot for 11.00.  

- -->>  1. Download BIND812_v4.depot.gz from the ftp site.
         This file is temporary and will be deleted when a
         product upgrade is available from

        System:  (
        Login:     bind
        Password:  bind1

        FTP Access:
                or: ftp://bind:bi...@
        file: 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

- -->>  2. Copy the BIND812_v4.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 BIND812_v4.depot is:

- -->>        MD5 (BIND812_v4.depot) =
- -->>                db894b51d6af9855b56150db118bc59f

          The cksum output is:

- -->>        cksum BIND812_v4.depot
- -->>        2493565620 1116160 BIND812_v4.depot

- -->>  3. Install BIND812_v4.depot using swinstall.

      III. 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
      PHCO_27882: s700_800 10.24 (VVOS) libc
      PHNE_27646.depot s700_800 11.00 libnss_dns DNS backend patch
- -->>  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
      PHNE_27647.depot s700_800 11.11 libnss_dns DNS backend patch
- -->>  PHNE_27794.depot s700_800 11.11 Bind-8.1.2 patch

- -->> 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_27646.depot) = f15f7f0dd5098b55df363007197b9fcb
     cksum 891782754 61440 PHNE_27646.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

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

- -->> MD5 (PHNE_27794.depot) = aa2d467e274ef5637bbd16a96730383e
- -->> cksum 540047999 665600 PHNE_27794.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.

- -->>  IV.  Install libc.1.1010 and libc.a.1010 on HP-UX 10.10.

- -->>       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.

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

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

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(c) Copyright 2002 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
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Version: PGP Personal Security 7.0.3


Yours truly,
HP S/W Security Team
WTEC Cupertino, California