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                         AUSCERT Security Bulletin

                               ASB-2012.0007
        A denial of service vulnerability has been fixed in BIG-IP
                              12 January 2012

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

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

Product:              BIG-IP LTM
Operating System:     Network Appliance
Impact/Access:        Denial of Service -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2011-3192  
Member content until: Saturday, February 11 2012
Reference:            ASB-2011.0076.2
                      ESB-2011.0870.2

Comment: Please note that this vulnerability is being actively exploited.

OVERVIEW

        A denial of service vulnerability has been fixed in BIG-IP.


IMPACT

        The National Vulnerability Database describes CVE-2011-3192 as follows:
        
        "The byterange filter in the Apache HTTP Server 1.3.x, 2.0.x through
        2.0.64, and 2.2.x through 2.2.19 allows remote attackers to cause a
        denial of service (memory and CPU consumption) via a Range header that
        expresses multiple overlapping ranges, as exploited in the wild in
        August 2011..." [1]


MITIGATION

        The vendor has provided the following information about the
        fix:
        
        "Byte Range requests sent to the Admin GUI or an APM login page are now
        limited to at most 5 byte range sets, to prevent the vulnerability
        described in CVE-2011-3192." [2][3]
        
        The fix is included in versions 10.2.3 and 11.1.0. [2][3]


REFERENCES

        [1] Vulnerability Summary for CVE-2011-3192
            http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2011-3192

        [2] Release Note: BIG-IP LTM and TMOS version 10.2.3
            http://support.f5.com/kb/en-us/products/big-ip_ltm/releasenotes/product/relnotes-LTM-10-2-3.html

        [3] Release Note: BIG-IP LTM and TMOS version 11.1.0
            http://support.f5.com/kb/en-us/products/big-ip_ltm/releasenotes/product/relnote-ltm-11-1-0.html

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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