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SUPPORT COMMUNICATION - SECURITY BULLETIN

Document ID: c00668546

Version: 1

HPSBUX02117 SSRT2400 rev.1 - HP-UX Running BINDv4 Domain Name Server (DNS) Remote Unauthorized Access, Denial of Service (DoS)

NOTICE: The information in this Security Bulletin should be acted upon as soon as possible.

Release Date: 2006-05-09
Last Updated: 2006-05-12

Potential Security Impact: Remote unauthorized access, Denial of Service (DoS) 

Source: Hewlett-Packard Company, HP Software Security Response Team

VULNERABILITY SUMMARY
A potential security vulnerability has been identified with HP-UX running the 
BINDv4 Domain Name Server (DNS). The vulnerability could be exploited to 
poison the DNS cache leading to remote unauthorized access or Denial of Service 
(DoS). 

References: CERT VU#457875, HPSBGN01156

SUPPORTED SOFTWARE VERSIONS*: ONLY impacted versions are listed.
HP-UX B.11.00. 

BACKGROUND
For a PGP signed version of this security bulletin please write to: security-alert@hp.com 

CERT VU#457875 ( https://www.kb.cert.org/vuls/id/457875) reports a potential security 
vulnerability in the BINDv4 Domain Name Server (DNS). 

HP-UX B.11.00 may be affected by this vulnerability if the BINDv4 Domain Name Server 
(DNS) is configured to do both of the following:

  * support recursive requests and cache the results 
  * respond to DNS requests made by untrusted systems 

To determine if an HP-UX system has an affected version, search the output of 
"swlist -a revision -l fileset" for one of the filesets listed below. For affected 
systems verify that the recommended action has been taken.

AFFECTED VERSIONS

HP-UX B.11.00
=============
InternetSrvcs.INETSVCS-RUN
action: add "options no-recursion" to /etc/named.boot

END AFFECTED VERSIONS

RESOLUTION
The potential vulnerability may be avoided by blocking access to the system from 
untrusted systems or by disabling DNS recursion. 

To disable DNS recursion, add the following to /etc/named.boot:

  options no-recursion 

The option will take effect when named is restarted.

Note: This issue has been previously reported in HPSBGN01156 SSRT2400 rev.0 (7 August 2003). HPSBGN01156 did not have the Affected Versions for the HP-UX Security Patch Check. The Affected Versions information is contained in this Security Bulletin.

MANUAL ACTIONS: Yes - NonUpdate
add "options no-recursion" to /etc/named.boot

PRODUCT SPECIFIC INFORMATION 
HP-UX Security Patch Check: Security Patch Check revision B.02.00 analyzes all HP-issued Security Bulletins to provide a subset of recommended actions that potentially affect a specific HP-UX system. For more information: https://software.hp.com/portal/swdepot/displayProductInfo.do?productNumber=B6834AA 

HISTORY 
Version: 1 (rev.1) - 15 May 2006 Initial release

Support: For further information, contact normal HP Services
support channel.

Report: To report a potential security vulnerability with any HP
supported product, send Email to: security-alert@hp.com.  It is
strongly recommended that security related information being
communicated to HP be encrypted using PGP, especially exploit
information.  To get the security-alert PGP key, please send an
e-mail message as follows:
  To: security-alert@hp.com
  Subject: get key

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To review previously published Security Bulletins visit:
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* The Software Product Category that this Security Bulletin
relates to is represented by the 5th and 6th characters of the
Bulletin number in the title:

    GN = HP General SW,
    MA = HP Management Agents,
    MI = Misc. 3rd party SW,
    MP = HP MPE/iX,
    NS = HP NonStop Servers,
    OV = HP OpenVMS,
    PI = HP Printing & Imaging,
    ST = HP Storage SW,
    TL = HP Trusted Linux,
    TU = HP Tru64 UNIX,
    UX = HP-UX,
    VV = HP Virtual Vault


System management and security procedures must be reviewed
frequently to maintain system integrity. HP is continually
reviewing and enhancing the security features of software products
to provide customers with current secure solutions.

"HP is broadly distributing this Security Bulletin in order to
bring to the attention of users of the affected HP products the
important security information contained in this Bulletin. HP
recommends that all users determine the applicability of this
information to their individual situations and take appropriate
action. HP does not warrant that this information is necessarily
accurate or complete for all user situations and, consequently, HP
will not be responsible for any damages resulting from user's use
or disregard of the information provided in this Bulletin. To the
extent permitted by law, HP disclaims all warranties, either
express or implied, including the warranties of merchantability
and fitness for a particular purpose, title and non-infringement."


(c)Copyright 2006 Hewlett-Packard Development Company, L.P.
Hewlett-Packard Company shall not be liable for technical or
editorial errors or omissions contained herein. The information
provided is provided "as is" without warranty of any kind. To the
extent permitted by law, neither HP nor its affiliates,
subcontractors or suppliers will be liable for incidental, special
or consequential damages including downtime cost; lost profits;
damages relating to the procurement of substitute products or
services; or damages for loss of data, or software restoration.
The information in this document is subject to change without
notice. Hewlett-Packard Company and the names of Hewlett-Packard
products referenced herein are trademarks of Hewlett-Packard
Company in the United States and other countries. Other product
and company names mentioned herein may be trademarks of their
respective owners.

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