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                         AUSCERT Security Bulletin

                               ASB-2013.0028
         A number of vulnerabilities have been identified in Ruby
                             25 February 2013

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

        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-2013-0269  
Member content until: Wednesday, March 27 2013

OVERVIEW

        A number of vulnerabilities have been identified in Ruby prior to 
        versions 1.9.3 patchlevel 392 and 2.0.0 patchlevel 0. [1, 2]


IMPACT

        The vendor has provided the following details regarding these 
        vulnerabilities:
        
        "Unrestricted entity expansion can lead to a DoS vulnerability in 
        REXML." [1]
        
        "There is a denial of service and unsafe object creation 
        vulnerability in the json bundled with ruby. This vulnerability has
        been assigned the CVE identifier CVE-2013-0269." [2]


MITIGATION

        The vendor recommends updating to the latest version of Ruby to
        correct these issues. [1, 2]


REFERENCES

        [1] Entity expansion DoS vulnerability in REXML (XML bomb)
            http://www.ruby-lang.org/en/news/2013/02/22/rexml-dos-2013-02-22/

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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