A data source object (DSO) exploit is a form of spyware that takes advantage of data binding to gain access to the hard drive of a computer connected to the Internet. Such spyware can be difficult to detect and eradicate, and if it is successfully removed, it often returns.
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DSO exploits can affect Microsoft Internet Explorer, Outlook, and Outlook Express. In Internet Explorer versions 5.5 and later, a DSO exploit can operate even when ActiveX controls have been disabled.