![]() NT AUTHORITY\SYSTEM, a system-level user with no limitations.įurthermore, the service is included by default on all recent Windows operating system, exposing hundreds of millions of PCs to remote hacking. This is because the service runs without sandboxing - a basic and very efficient security feature -, but also because the service runs as "Vulnerabilities in MsMpEng are among the most severe possible in Windows, due to the privilege, accessibility, and ubiquity of the service," Tavis Ormandy, one of the Google researchers says. This includes scenarios such as sending an email with the exploit included in the message's body, hosting malicious JavaScript code inside a web page, or by delivering a JS exploit to thousands or millions on users, via ads on reputable sites. The researchers say the issue can be exploited with no user interaction needed. The two experts say that NScript mishandles how it interprets some JavaScript object types, which allows them to deliver an exploit that can use the Microsoft Malware Protection Engine to execute malicious code. Microsoft Forefront Endpoint Protection 2010Īccording to the Google experts, the bug is a "type confusion" vulnerability in NScript, the MsMpEng component that handles "any filesystem or network activity that looks like JavaScript.".Microsoft Forefront Security for SharePoint Service Pack 3.Microsoft System Center Endpoint Protection.Vulnerability affects Microsoft Malware Protection EngineĪs per the two sources, the bug affects the Microsoft Malware Protection Engine (MsMpEng), a core service that ships with Windows 7, Windows 8.1, Windows 10, and Windows Server 2016, and which is the core of many of Microsoft security tools, such as: While initially the two Google experts didn't reveal what Windows feature the bug was found in, the veil of mystery lifted yesterday when both Microsoft and the two experts shared more details about the issue. In an emergency out-of-band update released late last night, Microsoft fixed a vulnerability in the Microsoft Malware Protection Engine discovered by two Google security experts over the weekend, and which the two described as " crazy bad" and "the worst Windows remote code exec in recent memory."
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