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                         AUSCERT Security Bulletin

                               ASB-2010.0194
                A vulnerability has been identified in Ruby
                              16 August 2010

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

Product:              Ruby prior to 1.9.1-p430
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact/Access:        Cross-site Scripting -- Remote with User Interaction
Resolution:           Patch/Upgrade
CVE Names:            CVE-2010-0541  
Member content until: Wednesday, September 15 2010
Reference:            ESB-2010.0536

OVERVIEW

        A vulnerability has been identified in Ruby prior to version 
        1.9.1-p430.


IMPACT

        The vendor has provided the following details regarding this 
        vulnerability which has been assigned CVE-2010-0541:
        
        "WEBrick have had a cross-site scripting vulnerability that allows an 
        attacker to inject arbitrary script or HTML via a crafted URI. This 
        does not affect user agents that strictly implement HTTP/1.1, however, 
        some user agents do not." [1]


MITIGATION

        The vendor recommends upgrading to the latest version of Ruby. [2]


REFERENCES

        [1] XSS in WEBrick (CVE-2010-0541)
            http://www.ruby-lang.org/en/news/2010/08/16/xss-in-webrick-cve-2010-0541/

        [2] Ruby 1.9.1-p430 is released
            http://www.ruby-lang.org/en/news/2010/08/16/ruby-1-9-1-p430-is-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.

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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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