Actively Exploited Zero-Day Bug Patched by Microsoft

Microsoft’s May Patch Tuesday roundup also included critical fixes for a number of flaws found in infrastructure present in many enterprise and cloud environments.

Microsoft has revealed 73 new patches for May’s monthly update of security fixes, including a patch for one flaw–a zero-day Windows LSA Spoofing Vulnerability rated as “important”—that is currently being exploited with man-in-the-middle attacks.

The software giant’s monthly update of patches that comes out every second Tuesday of the month–known as Patch Tuesday—also included fixes for seven “critical” flaws, 65 others rated as “important,” and one rated as “low.”

Given that Microsoft released a record number of patches in April, May’s patch tally is relatively low, but still includes a number of notable flaws that deserve attention, researchers said.

“Although this isn’t a large number, this month makes up for it in severity and infrastructure headaches,” observed Chris Hass, director of security at security firm Automox, in an email to Threatpost. “The big news is the critical vulnerabilities that need to be highlighted for immediate action.”

Of the seven critical flaws, five allow for remote code execution (RCE) and two give attackers elevation of privilege (EoP). The remainder of the flaws also include a

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