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Microsoft Patches Windows Zero-Day Disclosed via Twitter

September 12, 2018

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Microsoft’s Patch Tuesday updates for September 2018 address over 60 vulnerabilities, including a zero-day disclosed by a researcher and exploited shortly after by a threat actor.

The actively exploited flaw, identified as CVE-2018-8440, was disclosed on August 27 by a researcher who uses the online moniker SandboxEscaper. The security hole was not reported to Microsoft before its existence was disclosed via Twitter as SandboxEscaper was apparently frustrated with the company’s vulnerability reporting process.

The privilege escalation vulnerability, which according to Microsoft exists when Windows improperly handles calls to the Advanced Local Procedure Call (ALPC) interface of the Task Scheduler, can be exploited by an authenticated attacker to execute code with elevated privileges.

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