Microsoft fixes remote hacking imperfection in Windows Malware Protection Engine

The engine is used by Windows Defender, the malware scanner preinstalled on Windows 7 and later, as well as by other Microsoft consumer and enterprise security products: Microsoft Security Essentials, Microsoft Forefront Endpoint Protection 2010, Microsoft Endpoint Protection, Microsoft Forefront Security for SharePoint Service Pack 3, Microsoft System Center Endpoint Protection and Windows Intune Endpoint Protection. According to a Microsoft security advisory published Monday, the vulnerability can be triggered when the Microsoft Malware Protection Engine scans a specially crafted file. Users should check that the Microsoft Malware Protection Engine version used in their products is 1.1.10701.0 or later. "Enterprise administrators should also verify that the latest version of the Microsoft Malware Protection Engine and definition updates are being actively downloaded, approved and deployed in their environment." Because the Microsoft Malware Protection Engine runs with LocalSystem privileges, successful exploitation of this vulnerability could allow hackers to take full control of the underlying OS.


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MsMpEng: Remotely Exploitable Type Confusion in Windows 8, 8.1, 10, Windows Server, SCEP, Microsoft Security Essentials, and more.

This code is executed by MsMpEng, which runs as NT AUTHORITY\SYSTEM, and is enabled by default on Windows 8, 8.1, 10, Windows Server 2008 and Windows Server 2012. JavaScriptLog(): yes > for (i in document) log(i) JavaScriptLog(): appendChild JavaScriptLog(): attributes JavaScriptLog(): childNodes JavaScriptLog(): createElement JavaScriptLog(): createTextNode JavaScriptLog(): getElementById JavaScriptLog(): getElementsByTagName JavaScriptLog(): write JavaScriptLog(): writeln JavaScriptLog(): referrer JavaScriptLog(): cookie JavaScriptLog(): location JavaScriptLog(): undefined > window.ScriptEngineBuildVersion JavaScriptLog(): [object Function] > window.ScriptEngineBuildVersion() JavaScriptLog(): 8831 We have discovered that the function JsDelegateObject_Error::toString() reads the "message" property from the this object, but fails to validate the type of the property before passing it to JsRuntimeState::triggerShortStrEvent(). JavaScriptLog(): yes > for (i in document) log(i) JavaScriptLog(): appendChild JavaScriptLog(): attributes JavaScriptLog(): childNodes JavaScriptLog(): createElement JavaScriptLog(): createTextNode JavaScriptLog(): getElementById JavaScriptLog(): getElementsByTagName JavaScriptLog(): write JavaScriptLog(): writeln JavaScriptLog(): referrer JavaScriptLog(): cookie JavaScriptLog(): location JavaScriptLog(): undefined > 6 * 9 JavaScriptLog(): 54 > window.ScriptEngineBuildVersion JavaScriptLog(): [object Function] > window.ScriptEngineBuildVersion() JavaScriptLog(): 8831 We have discovered that the function JsDelegateObject_Error::toString() reads the "message" property from the this object, but fails to validate the type of the property before passing it to JsRuntimeState::triggerShortStrEvent(). JavaScriptLog(): yes > for (i in document) log(i) JavaScriptLog(): appendChild JavaScriptLog(): attributes JavaScriptLog(): childNodes JavaScriptLog(): createElement JavaScriptLog(): createTextNode JavaScriptLog(): getElementById JavaScriptLog(): getElementsByTagName JavaScriptLog(): write JavaScriptLog(): writeln JavaScriptLog(): referrer JavaScriptLog(): cookie JavaScriptLog(): location JavaScriptLog(): undefined > window.ScriptEngineBuildVersion JavaScriptLog(): [object Function] > window.ScriptEngineBuildVersion() JavaScriptLog(): 8831 While testing, we have discovered that the function JsDelegateObject_Error::toString() reads the "message" property from the this object, but fails to validate the type of the property before passing it to JsRuntimeState::triggerShortStrEvent(). Additionally, Microsoft Security Essentials, System Centre Endpoint Protection and various other Microsoft security products also use MPENGINE.




The buggy output occurs when printing from the Windows 10 'Microsoft Print to PDF' feature in Edge. The Edge user who reported the bug, a Matthias I, posted two PDFs to demonstrate the issue, which he says is present in Microsoft Edge 38.14393.1066.0, Microsoft EdgeHTML 14.14393 and Edge 40.15063, EdgeHTML 15.15063. Multiple users have reported experiencing the same problem on Microsoft's Edge bug tracker page. "Edge displays PDF correctly but printed content differs notably," Mattias I wrote. One user who reported experiencing the same issue with Edge said that switching to Adobe Acrobat Reader resolved the issue.


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collected by :Andro Alex