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                         AUSCERT Security Bulletin

                               ASB-2012.0111
  A denial of service vulnerability has been fixed in Ruby on Rails 3.2.7
                               9 August 2012

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

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

Product:              Ruby on Rails
Operating System:     Windows
                      UNIX variants (UNIX, Linux, OSX)
Impact/Access:        Denial of Service -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2012-3424  
Member content until: Saturday, September  8 2012

OVERVIEW

        A denial of service vulnerability has been identified in Ruby on Rails
        prior to 3.2.7.


IMPACT

        The vendor has provided the following information:
        
        "There is a DoS vulnerability in Action Pack digest authentication
        handling in Rails. This vulnerability has been assigned the CVE
        identifier CVE-2012-3424." [1]
        
        "Impacted code uses any of the `with_http_digest` controller 
        helper methods." [1]


MITIGATION

        The vulnerability is fixed in Ruby on Rails 3.2.7. [2] There are also
        patches available for those unable to upgrade. [1]


REFERENCES

        [1] Ruby on Rails DoS Vulnerability in
            authenticate_or_request_with_http_digest (CVE-2012-3424)
            https://groups.google.com/group/rubyonrails-security/browse_thread/thread/bf1263adcd79a983

        [2] Rails version 3.2.7 has been released!
            http://weblog.rubyonrails.org/2012/7/26/ann-rails-3-2-7-has-been-released/

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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