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             AUSCERT External Security Bulletin Redistribution

              ESB-2005.0077 -- UNIRAS ALERTS 03/05 and 04/05
          Denial of Service Vulnerabilities in BIND 8 and BIND 9
                              27 January 2005

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           BIND 8.4.4, 8.4.5 and 9.3.0
Publisher:         UNIRAS
Operating System:  UNIX variants
                   Linux variants
Impact:            Denial of Service
Access:            Remote/Unauthenticated
CVE Names:         CAN-2005-0033 CAN-2005-0034

Original Bulletin: http://www.niscc.gov.uk/niscc/vulnAdv-en.html

Comment: This bulletin contains two separate advisories, for BIND 8 and 
         BIND 9 respectively.

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

- ----------------------------------------------------------------------------------
      UNIRAS (UK Govt CERT) ALERT - 03/05 dated 25.01.05  Time: 14:10  
 UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
- ---------------------------------------------------------------------------------- 
  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
- ----------------------------------------------------------------------------------

Title
=====

Vulnerability Issues with the BIND 8 Software

Detail
====== 

NISCC Vulnerability Advisory 454305/NISCC/BIND8

Vulnerability Issues with the BIND 8 Software

Version Information
- -------------------
Advisory Reference  454305/NISCC/BIND8
Release Date	    25 Jan 2005
Last Revision	    21 Jan 2005
Version Number	    1.0

What is affected?
- -----------------
The vulnerability only affects BIND v8.4.4 and v8.4.5.

Severity 
- --------
This is rated as low, although if exploited this could potentially result in a 
denial-of-service.

Summary
- -------
A remote buffer overrun vulnerability concerning BIND 8 have been discovered by the Internet 
Systems Consortium, Inc. (ISC).

ISC have solutions available that can rectify these issues, please refer to the 
'Solution' section for further information.

[Please note that revisions to this advisory will not be notified by email. All 
subscribers are advised to regularly check the NISCC website 
(http://www.niscc.gov.uk/niscc/vulnAdv-en.html) for updates to this notice.]

Details
- -------
CVE ID: CAN-2005-0033

BIND uses a certain array to track nameservers/addresses that have been queried; it is possible to remotely overrun the buffer for
this array and hence cause a denial-of-service.

Mitigation
- ----------
ISC have recommended the following work-around:

- - Disable recursion and glue fetching

Solution
- --------
ISC have released an updated version of BIND to rectify this issue:

- - BIND 8.4.6

This is available from the ISC website at http://www.isc.org/sw/bind/.

ISC have also produced a patch for users who cannot upgrade to BIND 8.4.6; please contact
the NISCC Vulnerability Team at vulteam@niscc.gov.uk if you wish to receive the patch.

Vendor Information
- ------------------
Internet Systems Consortium, Inc. (ISC) is a non-profit public benefit corporation 
dedicated to supporting the infrastructure of the Internet. Please visit
http://www.isc.org for further information regarding ISC.

Credits
- -------
The NISCC Vulnerability Team would like to thank ISC for reporting this issue to NISCC and 
for their assistance in the handling of this vulnerability.


- ----------------------------------------------------------------------------------
      UNIRAS (UK Govt CERT) ALERT - 04/05 dated 25.01.05  Time: 14:10 
 UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
- ---------------------------------------------------------------------------------- 
  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
- ----------------------------------------------------------------------------------

Title
=====

Vulnerability Issues with the BIND 9 Software

Detail
====== 

NISCC Vulnerability Advisory 731920/NISCC/BIND9

Vulnerability Issues with the BIND 9 Software

Version Information
- -------------------
Advisory Reference  731920/NISCC/BIND9
Release Date	    25 Jan 2005
Last Revision	    21 Jan 2005
Version Number	    1.0

What is affected?
- -----------------
The vulnerability only affects BIND v9.3.0.

Severity 
- --------
This is rated as low, although if exploited this could potentially result in a 
denial-of-service.

Summary
- -------
A weakness in the self-check function of BIND 9 have been discovered by the Internet 
Systems Consortium, Inc. (ISC).

ISC have solutions available that can rectify these issues, please refer to the 
'Solution' section for further information.

[Please note that revisions to this advisory will not be notified by email. All 
subscribers are advised to regularly check the NISCC website 
(http://www.niscc.gov.uk/niscc/vulnAdv-en.html) for updates to this notice.]

Details
- -------
CVE ID: CAN-2005-0034

An incorrect assumption in the validator can result in an internal consistency test failing
and this can cause named to terminate abnormally.

Mitigation
- ----------
ISC have recommended the following work-around:

- - Disable dnssec validation (off by default) at	the Options/View level

Solution
- --------
ISC have released an updated version of BIND to recitify this issue:

- - BIND 9.3.1

This is available from the ISC website at http://www.isc.org/sw/bind/.

ISC have also produced a patch for users who cannot upgrade to BIND 9.3.1; please contact
the NISCC Vulnerability Team at vulteam@niscc.gov.uk if you wish to receive the patch.

Vendor Information
- ------------------
Internet Systems Consortium, Inc. (ISC) is a non-profit public benefit corporation 
dedicated to supporting the infrastructure of the Internet. Please visit
http://www.isc.org for further information regarding ISC.

Credits
- -------
The NISCC Vulnerability Team would like to thank ISC for reporting this issue to NISCC and 
for their assistance in the handling of this vulnerability.

What is NISCC?
- --------------
For further information regarding the UK National Infrastructure Security Co-ordination Centre, please visit http://www.niscc.gov.uk.
 
Reference to any specific commercial product, process, or service by trade name, trademark manufacturer, or otherwise, does not constitute or imply its endorsement, recommendation, or favouring by NISCC. The views and opinions of authors expressed within this notice shall 
not be used for advertising or product endorsement purposes.

Neither shall NISCC accept responsibility for any errors or omissions contained within 
this advisory. In particular, they shall not be liable for any loss or damage whatsoever, 
arising from or in connection with the usage of information contained within this notice.

C 2005 Crown Copyright 
- ----------------------------------------------------------------------------------
UNIRAS wishes to acknowledge the contributions of ISC for the information 
contained in this Briefing. 
- ----------------------------------------------------------------------------------
This Briefing contains the information released by the original author. Some 
of the information may have changed since it was released. If the vulnerability 
affects you, it may be prudent to retrieve the advisory from the canonical site 
to ensure that you receive the most current information concerning that problem.

Reference to any specific commercial product, process, or service by trade 
name, trademark manufacturer, or otherwise, does not constitute or imply 
its endorsement, recommendation, or favouring by UNIRAS or NISCC.  The views 
and opinions of authors expressed within this notice shall not be used for 
advertising or product endorsement purposes.

Neither UNIRAS or NISCC shall also accept responsibility for any errors 
or omissions contained within this briefing notice. In particular, they shall 
not be liable for any loss or damage whatsoever, arising from or in connection 
with the usage of information contained within this notice.

UNIRAS is a member of the Forum of Incident Response and Security Teams (FIRST) 
and has contacts with other international Incident Response Teams (IRTs) in 
order to foster cooperation and coordination in incident prevention, to prompt 
rapid reaction to incidents, and to promote information sharing amongst its 
members and the community at large. 
- ----------------------------------------------------------------------------------
- --------------------------END INCLUDED TEXT--------------------

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===========================================================================
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The University of Queensland
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