"While this prevents malicious files from being viewed in Windows Explorer, it does not prevent a local, authenticated user from running a specially crafted program to exploit this vulnerability", Microsoft cautions.
On Windows 10 devices successfully exploiting the two zero-day vulnerabilities will only lead to code execution with limited privileges and capabilities within an AppContainer sandbox context according to Microsoft's advisory.
The company said: "There are multiple ways an attacker could exploit the vulnerability, such as convincing a user to open a specially crafted document or viewing it in the Windows Preview pane".
Microsoft says that it's not aware of any known issues with these optional patches, but keep in mind that you'll still get all these fixes if you wait for next month's Patch Tuesday update.
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The flaws exist in the Windows Adobe Type Manager Library, which allows apps to manage and render fonts available from Adobe Systems. This occurs on the second Tuesday of each month, meaning the next update would not be until April.
The more worrying problem here is that Microsoft says it is aware of "limited target attacks" that are leveraging this vulnerability and has listed it as a critical vulnerability. The update is not being released to all Windows 7 customers since the operating system reached end of support on January 14, 2020. Although Windows 7 is also affected, only enterprise users with extended security support will receive patches.
Until then, Microsoft suggests a few workarounds: disable the preview and details pane in Windows Explorer, disable the WebClient service, and rename ATMFD.DLL or disable the file from the registry. When this service is disabled, Microsoft said WebDAV requests aren't transmitted and services that depend on the WebClient service won't start. However, Microsoft said users will be prompted for confirmation before opening arbitrary programs from the Internet. Doing so will prevent Windows from automatically displaying OTF fonts. The company is now working on a patch to solve the issue.