Ruby: Denial of Service -- Remote/Unauthenticated

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                         AUSCERT Security Bulletin

                               ASB-2012.0157
                     Ruby 1.9.3-p27 has been released
                             12 November 2012

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

Product:              Ruby
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact/Access:        Denial of Service -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
CVE Names:            CVE-2012-5371  
Member content until: Wednesday, December 12 2012

OVERVIEW

        Ruby 1.9.3-p327 has been released, fixing a hash-flooding denial of
        service vulnerability. [1]


IMPACT

        The following vulnerability information is from the Ruby website:
        
        CVE-2012-5371:
        "Carefully crafted sequence of strings can cause a denial of service
        attack on the service that parses the sequence to create a Hash object
        by using the strings as keys. For instance, this vulnerability affects
        web application that parses the JSON data sent from untrusted
        entity." [2]


MITIGATION

        All users should upgrade to the latest version. [1]


REFERENCES

        [1] Ruby 1.9.3-p327 is released
            http://www.ruby-lang.org/en/news/2012/11/09/ruby-1-9-3-p327-is-released/

        [2] Hash-flooding DoS vulnerability for ruby 1.9 (CVE-2012-5371)
            http://www.ruby-lang.org/en/news/2012/11/09/ruby19-hashdos-cve-2012-5371/

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
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