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What to know about ToolShell, the SharePoint threat under mass exploitation


Easy to exploit. Unauthenticated access. Massive reach. ToolShell has it all.

Government agencies and private industry have been under siege over the past four days following the discovery that a critical vulnerability in SharePoint, the widely used document-sharing app made by Microsoft, is under mass exploitation. From there, the webshell extracts tokens and other credentials that allow the attackers to gain administrative privileges, even when systems are protected by multifactor authentication and single sign-on. Dan Goodin is Senior Security Editor at Ars Technica, where he oversees coverage of malware, computer espionage, botnets, hardware hacking, encryption, and passwords.

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