0patch fixes CVE-2021-26877 in the DNS server of Windows Server 2008 R2

[German]ACROS Security has released a micropatch for the CVE-2021-26877 vulnerability in the Windows Server 2008 R2 DNS server. This vulnerability was patched by Microsoft in March 2021 via a security update. The 0patch solution is for people who do not have an ESU license.


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The vulnerability CVE-2021-26877

CVE-2021-26877 is a remote code execution (RCE) vulnerability in Windows DNS Server. Attack compatibility is rated low by Microsoft and no user interaction is required. Microsoft anticipates that the vulnerability is likely to be exploited.

Microsoft has released security updates for Windows Server 2008 R2 through Windows Server 2004 and 20H2 as of March 9, 2021. However, Windows Server 2008 R2 systems will only receive this security update if a valid ESU license is present.

0patch Micropatch for Windows Server 2008 R2

Mitja Kolsek from ACROS Security points out in the following tweet that there is a micropatch for the vulnerability in the DNS server for Windows Server 2008 R2.

0patch für Schwachstelle CVE-2021-2687

The micropatch is available for systems running Windows Server 2008 R2 that do not have Extended Security Update support (ESU) from Microsoft, but do have an opatch Pro subscription (for 23 Euro+VAT/year). Notes on how the 0patch agent works, which loads the micropatches into memory at an application’s runtime, can be found in blog posts (such as here).


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