0patch fixes CVE-2020-1015 in Windows 7/Server 2008 R2

win7[German]ACROS Security has released a micropatch for the CVE-2020-1015 vulnerability in the User-Mode Power Service of Windows 7 and Server 2008 R2 (without ESU license).


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The vulnerability CVE-2020-1015

CVE-2020-1015  is an Elevation of Privilege vulnerability in the user mode power service. It occurs because the user-mode power service (UMPS) incorrectly handles objects in memory. An attacker who successfully exploited the vulnerability could execute code with elevated privileges. However, to exploit the vulnerability, a locally authenticated attacker would have to execute a specially crafted application.

Microsoft describes the vulnerability in this document and released security updates for Windows 7 through Windows 10 on April 14, 2020. However, users of Windows 7 SP1 and Windows Server 2008 R2 who do not have an ESU license will no longer receive the security updates released by Microsoft. 

A security researcher has analyzed this and pointed out details including a proof of concept in the above tweet.

0patch-Fix for Windows 7 SP1/Server 2008 R2

ACROS Security has developed a micropatch for the vulnerability CVE-2020-1015. Mitja Kolsek from ACROS Security informed me privately that the micropatch for Windows 7 SP1 and Windows Server 2008 R2 has been released. There is now also a message on Twitter. 


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In further follow-up tweets ACROS Security gives further explanations about the vulnerability and the micropatch. This patch is available for subscribers of the Pro and Enterprise version. Hints on how the 0patch agent, which loads the micropatch into memory at runtime of an application, works can be found in the blog posts (e.g. here), which I have linked below. 

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