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                         AUSCERT Security Bulletin

                               ASB-2009.1074
                      Two XSS exploits in DotNetNuke
                             7 September 2009

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

Product:              DotNetNuke
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact/Access:        Cross-site Scripting -- Remote/Unauthenticated
Resolution:           Patch/Upgrade
Member content until: Wednesday, October  7 2009

OVERVIEW

        Two security vulnerabilities have been corrected in DotNetNuke.


IMPACT

        The vendor has provided the following information regarding these
        vulnerabilities:
        
        "To support switching between languages via the Language skin object,
        the skin object renders the existing page path along with the relevant
        country flag and a language token. It also supports the ability to
        supply replaceable tokens. The language skin object failed to encode
        the newly generated paths which meant that a hacker could inject
        html/script to perform cross-site scripting attacks." [1]
        
        "The DotNetNuke ClientAPI is a combination of client and server code,
        that allow developers to create a rich client-side experience. It's
        usage predates many of the more modern Ajax libraries. There are a
        number of places where the ClientAPI did not encode the contents of
        data passed to it, and echoed it back to the client. This unvalidated
        input could lead to html and script injections such as cross-site
        scripting." [2]


MITIGATION

        This vulnerability has been corrected in DotNetNuke 4.9.5/5.1.2.
        
        Note: The vendor recommends upgrading to DotNetNuke 5.1.2 as it
        "contains additional defensive coding to harden the ClientAPI against
        potential future issues" [2]


REFERENCES

        [1] HTML/Script Code Injection Vulnerability when working with multiple
            languages
            http://www.dotnetnuke.com/News/SecurityPolicy/securitybulletinno28/tabid/1363/Default.aspx

        [2] HTML/Script Code Injection Vulnerability in ClientAPI
            http://www.dotnetnuke.com/News/SecurityPolicy/securitybulletinno29/tabid/1364/Default.aspx

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.

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

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