[German]ACROS Security has released a micropatch for the vulnerability CVE-2020-1113 (Windows Task Scheduler Security Feature Bypass) for Windows 7 and Server 2008 R2 (without ESU license).
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The vulnerability CVE-2020-1113
CVE-2020-1113 is a Windows Task Scheduler security feature bypass vulnerability. The vulnerability allows security features in Microsoft Windows to be bypassed. The vulnerability exists because the Task Scheduler service (task scheduling) does not properly verify client connections via RPC. An attacker who successfully exploited this vulnerability could execute arbitrary code as administrator. An attacker could then install programs, view, modify, or delete data, or create new accounts with full user rights.
Microsoft describes the vulnerability in this document and released security updates for Windows 7 through Windows 10 on May 12, 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 that Microsoft has released.
0patch-Fix for Windows 7 SP1/Server 2008 R2
ACROS Security has developed a micropatch for the vulnerability CVE-2020-1113. I got the information about the release of the micropatch for Windows 7 SP1 and Windows Server 2008 R2 on Twitter.
Windows 7 and Server 2008 R2 users without Extended Security Updates have just received a micropatch for CVE-2020-1113, a Windows Task Scheduler Security Feature Bypass. pic.twitter.com/hOGUi6neDf
— 0patch (@0patch) August 11, 2020
More information about the vulnerability and the micropatch can be found in further follow-up tweets and in this blog post.
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The vulnerability lies in Task Scheduler accepting RPC requests that can be relayed. An attacker can piggyback on such requests by having some logged-on user send an SMB request to their computer, and then act as man-in-the-middle.
— 0patch (@0patch) August 11, 2020
This patch is available for subscribers of the Pro and Enterprise versions. For information on how the 0patch agent, which loads the micro patches into memory at runtime of an application, works, please refer to the blog posts (e.g. here) which I have linked below.
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