Microsoft Windows zero-day vulnerability disclosed through Twitter | Social

Microsoft has quickly reacted to the disclosure of a previously unknown zero-day vulnerability in the Windows operating system.

On Monday, Twitter user SandboxEscaper revealed the existence of the bug on the microblogging platform. As reported by the Register, the user said:

“Here is the alpc bug as 0day. I don’t f**king care about life anymore. Neither do I ever again want to submit to MSFT anyway. F**k all of this shit.”

The user linked to a page on GitHub which appears to contain a proof-of-concept (PoC) for the vulnerability.

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Following the disclosure, on Tuesday, Will Dormann, vulnerability analyst at CERT/CC verified the bug, adding that the zero-day flaw works “well in a fully-patched 64-bit Windows 10 system.”

The Windows vulnerability is described as a local privilege escalation security flaw in the Microsoft Windows task scheduler caused by errors in the handling of Advanced Local Procedure Call (ALPC) systems.

If exploited, the zero-day bug permits local users to obtain system privileges. As ALPC is a local system, the impact is limited, but the public disclosure of a zero-day is still likely a headache for the Redmond giant.

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There are no known workarounds for the vulnerability, which has been awarded a CVSS score of 6.4 — 6.8.

SandboxEscaper’s tweet has since been deleted. However, Microsoft has acknowledged the zero-day, telling the publication that the firm will “proactively update impacted devices as soon as possible.”

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This is likely to take place on September 11, the next scheduled Microsoft Patch Tuesday, unless the firm decides to issue an out-of-schedule patch.

ZDNet has reached out to Microsoft and will update if we hear back.

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