Microsoft Office Vulnerability Follina Discovered

Nao_sec has identified a zero-day vulnerability in Office and/or Windows in a document from Belarus.

“Interesting malloc was submitted from Belarus. It uses Word’s external link to load the HTML and then uses the “ms-msdt” scheme to execute PowerShell code,” said Nao_sec.

Security researcher Kevin Beaumont first named the exploit Follina but Microsoft later assigned the identifier CVE-2022-30190 and published a public advisory about it. 

“A remote code execution vulnerability exists when MSDT is called using the URL protocol from a calling application such as Word. An attacker who successfully exploits this vulnerability can run arbitrary code with the privileges of the calling application. The attacker can then install programs, view, change, or delete data, or create new accounts in the context allowed by the user’s rights,” said Microsoft. 

Microsoft advised users to disable the MSDT URL protocol and use cloud-based protection and automatic sample submission.

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