Directory traversal vulnerability in the NeffyLauncher 1.0.5 ActiveX control (NeffyLauncher.dll) in CDNetworks Nefficient Download allows remote attackers to download arbitrary code onto a client system via a .. (dot dot) in the SkinPath parameter and a .zip URL in the HttpSkin parameter. NOTE: this can be leveraged for code execution by writing to a Startup folder.

The NeffyLauncher 1.0.5 ActiveX control (NeffyLauncher.dll) in CDNetworks Nefficient Download uses weak cryptography for a KeyCode that blocks unauthorized use of the control, which allows remote attackers to bypass this protection mechanism by calculating the required KeyCode. NOTE: this can be used by arbitrary web sites to host exploit code that targets this control.