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Internet Explorer 6 / 7 bug exposed 50m PDF files

Microsoft’s Internet Explorer bug caused more than 50 million files stored online to leak potentially sensitive information that could compromise user privacy. Documents stored in Adobe’s PDF format display internal disk location where file’s stored, an oversight that can inadvertently expose real-world names and login IDs of users, operating system being used and other information. Google search expose almost four million documents residing on users’ C drives alone. This PDF, for example, was stored at C:\Program Files\Wids7\WizardReport.htm at time of printing. The path makes it clear that file was stored on a Windows machine that has software from Worldwide Instructional Design System installed. Other PDFs give up directory names that reveal authors, projects or other data that may’ve been designated confidential. The only way to remove the path is erase the text in an editor and save the document, revealed.

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