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                         AUSCERT Security Bulletin

                              ASB-2009.1043.3
        A vulnerability has been identified in the BIND server used
                            by BIG-IP products
                               7 August 2009

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

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

Product:              BIG-IP GTM versions 9.3 - 9.3.1
                      BIG-IP GTM versions 9.4 - 9.4.7
                      BIG-IP GTM versions 10.0.0 - 10.0.1
                      BIG-IP LTM versions 9.3 - 9.3.1
                      BIG-IP LTM versions 9.4 - 9.4.7
                      BIG-IP LTM versions 9.6 - 9.6.1
                      BIG-IP LTM versions 10.0.0 - 10.0.1
                      BIG-IP ASM versions 9.3 - 9.3.1
                      BIG-IP ASM versions 9.4 - 9.4.7
                      BIG-IP ASM versions 10.0.0 - 10.0.1
                      BIG-IP Link Controller versions 9.3 - 9.3.1
                      BIG-IP Link Controller versions 9.4 - 9.4.7
                      BIG-IP Link Controller versions 10.0.0 - 10.0.1
                      BIG-IP WebAccelerator versions 9.4 - 9.4.7
                      BIG-IP WebAccelerator versions 10.0.0 - 10.0.1
                      BIG-IP PSM versions 9.4.5 - 9.4.7
                      BIG-IP PSM versions 10.0.0 - 10.0.1
                      BIG-IP WAN Optimization versions 10.0.0 - 10.0.1
                      Enterprise Manager versions 1.6 - 1.8
Operating System:     Network Appliance
Impact/Access:        Denial of Service -- Remote/Unauthenticated
Resolution:           Mitigation
CVE Names:            CVE-2009-0696  
Member content until: Friday, September  4 2009
Reference:            ASB-2009.1033

Revision History:     August 7 2009: Additional hotfixes released
                      August 6 2009: Additional hotfixes released
                      August 5 2009: Initial Release

OVERVIEW

        A vulnerability has been identified in the BIND server used by BIG-IP 
        products that can allow an attacker to crash the BIND server. [1]
        
        The following products are known to be subject to this vulnerability:
        
        	* BIG-IP GTM versions 9.3 - 9.3.1
           	* BIG-IP GTM versions 9.4 - 9.4.7
            	* BIG-IP GTM versions 10.0.0 - 10.0.1 
        
        The following products use a vulnerable version of BIND, however
        according to the vendor, the vulnerable code is not used by default, 
        and these products are "... only vulnerable if BIND was manually 
        configured and enabled to be the master for one or more zones..." [1]:
        
        	* BIG-IP LTM versions 9.3 - 9.3.1
        	* BIG-IP LTM versions 9.4 - 9.4.7
        	* BIG-IP LTM versions 9.6 - 9.6.1
        	* BIG-IP LTM versions 10.0.0 - 10.0.1 
        	* BIG-IP ASM versions 9.3 - 9.3.1
        	* BIG-IP ASM versions 9.4 - 9.4.7
        	* BIG-IP ASM versions 10.0.0 - 10.0.1 
        	* BIG-IP Link Controller versions 9.3 - 9.3.1
        	* BIG-IP Link Controller versions 9.4 - 9.4.7
        	* BIG-IP Link Controller versions 10.0.0 - 10.0.1 
        	* BIG-IP WebAccelerator versions 9.4 - 9.4.7
        	* BIG-IP WebAccelerator versions 10.0.0 - 10.0.1 
        	* BIG-IP PSM versions 9.4.5 - 9.4.7
        	* BIG-IP PSM versions 10.0.0 - 10.0.1 
        	* BIG-IP WAN Optimization versions 10.0.0 - 10.0.1 
        	* Enterprise Manager versions 1.6 - 1.8


IMPACT

        This vulnerability in BIND 9 could cause the BIND service to crash. [2]


MITIGATION

        The vendor states that the "... issue was fixed in 
        Hotfix-BIGIP-9.3.1-74.0-HF7 issued for BIG-IP version 9.3.1 and in 
        Hotfix-BIGIP-9.4.7-326.0-HF1 issued for BIG-IP version 9.4.7. You may 
        download these hotfixes or later versions of the hotfixes from the F5 
        Networks Downloads site." Hotfixes have also been released for version 
        9.4.5, 9.4.6 and 10.0.1 to correct this vulnerability.
        
        The vendor has also provided a workaround for versions where hotfixes
        have not been provided, involving a "...packet filter workaround to
        filter and reject dynamic update packets by inspecting the opcode
        (operation code) of a DNS packet for updates." [1] Full details of
        how to implement this workaround can be found in F5's SOL10366 
        advisory. [1]


REFERENCES

        [1] SOL10366: BIND vulnerability - CVE-2009-0696
            https://support.f5.com/kb/en-us/solutions/public/10000/300/sol10366.html

        [2] BIND Dynamic Update DoS
            https://www.isc.org/node/474

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.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

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