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AA-2009.0108                  AUSCERT Advisory

                             [Win][UNIX/Linux]
                     TWiki: Cross-site Request Forgery
                                1 May 2009
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        AusCERT Advisory Summary
        ------------------------

Product:              TWiki
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact:               Cross-site Request Forgery
Access:               Existing Account
CVE Names:            CVE-2009-1339
Member content until: Friday, May 29 2009

OVERVIEW:

       A vulnerability has been identified in TWiki, prior to version 4.3.1.


IMPACT:

       The vulnerability has been assigned CVE-2009-1339 and is described
       by the vendor as:

       "Attack can be done by editing wiki pages and by issuing HTTP GET 
       requests towards the TWiki server (usually port 80/TCP). Typically, 
       prior authentication is necessary (including anonymous TWikiGuest 
       accounts). The vulnerability exists because TWiki allows HTTP GET to
       save pages, which opens up CSRF (Cross-site request forgery) attacks.
       An image tag can be crafted that, when viewed, updates pages with the 
       attackers content in TWiki as the viewing user, including members of 
       the TWikiAdminGroup. This can be used to gain administrator privileges, 
       change access permissions and do other things." [1]


MITIGATION:

       The vendor recommends upgrading to the latest version of TWiki. [1]


REFERENCES:

       [1] Security Alert CVE-2009-1339: CSRF Vulnerability with Image Tag
           http://twiki.org/cgi-bin/view/Codev/SecurityAlert-CVE-2009-1339

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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