AUSCERT External Security Bulletin Redistribution

           Sec. Vulnerability in DNS resolver libraries (rev. 1)
                              20 August 2002


        AusCERT Security Bulletin Summary

Product:                DNS resolver libraries
Vendor:                 Hewlett-Packard
Operating System:       HP-UX 11.11
                        HP-UX 11.00
Platform:               HP9000 Series 700
                        HP9000 Series 800
Impact:                 Execute Arbitrary Code/Commands
                        Denial of Service
Access Required:        Remote

Ref:                    ESB-2002.424

Comment: This bulletin has been updated to include information on
         Bind-8.1.2 and libnss_dns.

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

 **REVISED 01**
 Originally issued: 12 Aug 2002
 Last revised: 19 Aug 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.

**REVISED 01**

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, BINDv920.INETSVCS-BIND,
- -->>      Bind-8.1.2. and libnss_dns.

DAMAGE: Potential unauthorized access, denial of service.

SOLUTION: Until a product upgrade is available, download and
          install the preliminary fix, BIND920ver2.depot.
- -->>      Download and install the preliminary versions of
- -->>      the applicable patch.

MANUAL ACTIONS: Install BIND920ver2.depot. 
- -->>            Install upgrade_bind812_v4.depot on 11.00.
- -->>            Install preliminary patch.

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.
**REVISED 01**
 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.

 B. Recommended solution

**REVISED 01**
- -->> The following preliminary fixes are available:

- -->>  HP-UX 11.11

- -->>   BIND920ver2.depot for 11.11
- -->>   PHNE_25140.depot s700_800 11.11 Bind-8.1.2 patch
- -->>   PHNE_26747.depot s700_800 11.11 libnss_dns

- -->>  HP-UX 11.00

- -->>   upgrade_bind812_v4.depot for 11.00
- -->>   PHNE_27646.depot s700_800 11.00 libnss_dns


- -->>I. Until a product upgrade is available, download and install
       the BIND920ver2.depot. 

      1. Download BIND920ver2.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: BIND920ver2.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 BIND920ver2.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 BIND920ver2.depot is:

  MD5 (BIND920ver2.depot) = b5c7a1d3c18c83d015edb56da2eb0080
          The cksum output is:

  1311390197 20582400 BIND920ver2.depot

      3. Install BIND920ver2.depot using swinstall.

**REVISED 01**
- -->>II. Until a product upgrade is available, download and install
- -->>    the upgrade_bind812_v4.depot for 11.00.  The instructions 
- -->>    for BIND920ver2.depot above apply.

- -->>        file: upgrade_bind812_v4.depot.gz

- -->> MD5 (upgrade_bind812_v4.depot) = 
- -->>                45edb888017394aa8a206fb8ac292a04
- -->> cksum upgrade_bind812_v4.depot
- -->> 330647597 1116160 upgrade_bind812_v4.depot

**REVISED 01**
- -->>  III. Download and install the appropriate preliminary patch
- -->>       from the ftp site listed above:

- -->>  PHNE_27646.depot s700_800 11.00 libnss_dns DNS backend patch
- -->>  PHNE_26747.depot s700_800 11.11 libnss_dns DNS backend patch
- -->>  PHNE_25140.depot s700_800 11.11 Bind-8.1.2 patch

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

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

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

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- -----End of Document ID:  HPSBUX0208-209--------------------------------------

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

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