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                         AUSCERT Security Bulletin

                               ASB-2011.0102
                New vulnerability found and patched in BIND
                             17 November 2011

===========================================================================

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

Product:              BIND
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact/Access:        Denial of Service -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2011-4313  
Member content until: Saturday, December 17 2011
Reference:            ESB-2011.1155

Comment: This vulnerability is being actively exploited.
         
         Vendors will likely be releasing patches shortly, Debian has already
         released the patch (see: ESB-2011.1155).

OVERVIEW

        A denial of service vulnerability has been identified in all current
        versions of BIND 9. [1]


IMPACT

        Various organisations have reported to ISC that their BIND 9 servers
        have been crashing after performing recursive queries. ISC has stated
        that the problem is that BIND would cache an invalid record for which
        subsequent queries would trigger the crash. [1]


MITIGATION

        ISC has released mitigation patches that help mitigate this. The
        patches stop the inconsistent data from being returned from the cache
        and also detect and prevent a crash if the inconsistent data is found. [1]
        
        The patched versions of BIND are:
         - BIND 9.8.1-p1
         - BIND 9.7.4-p1
         - BIND 9.6-ESV-R5-p1
         - BIND 9.4-ESV-R5-p1


REFERENCES

        [1] BIND 9 Resolver crashes after logging an error in query.c
            https://www.isc.org/software/bind/advisories/cve-2011-4313

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours 
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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