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AA-2009.0128                  AUSCERT Advisory

                             [Win][UNIX/Linux]
                    DotNetNuke: Execute Arbitrary Code
                                27 May 2009
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        AusCERT Advisory Summary
        ------------------------

Product:              DotNetNuke
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact:               Execute Arbitrary Code/Commands
                      Inappropriate Access
Access:               Remote/Unauthenticated
Member content until: Wednesday, June 24 2009

OVERVIEW:

       Two security vulnerabilities have been corrected in DotNetNuke.


IMPACT:

       The vendor has provided the following information regarding these
       vulnerabilities:

       "Whilst installing DotNetNuke if an error occurs, as the custom error 
       handling system may not be in place a redirect is performed to an 
       error handling page. The error handling page optionally reads back a 
       querystring parameter that may contain additional error information. 
       Whilst this parameter is typically encoded, an invalid tag could be 
       used to bypass the filter, potentially to unencoded content being 
       echoed to the screen and could allow for script or html injection 
       issues." [1]

       "DotNetNuke has a custom errorpage for handling displaying information 
       to users. The errorpage contains details of the current running 
       version. This information could be useful to hackers attempting to 
       profile an application." [2] 


MITIGATION:

       This vulnerability has been corrected in DotNetNuke 4.9.4.


REFERENCES:

       [1] HTML/Script Code Injection Vulnerability
           http://www.dotnetnuke.com/News/SecurityPolicy/securitybulletinno27/tabid/1276/Default.aspx

       [2] Errorpage information leakage
           http://www.dotnetnuke.com/News/SecurityPolicy/securitybulletinno26/tabid/1275/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

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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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