Microsoft Defender now automatically mitigates a major issue used by Exchange attackers

Microsoft continues to take steps to address vulnerabilities utilized past the recent attacks on its Exchange Server software. The company released emergency fixes on March 2 and released a one-click mitigation tool to reduce the risk of an assault on vulnerable servers. Now, Microsoft has updated Microsoft Defender to address a vulnerability.

Microsoft Defender Antivirus and Arrangement Center Endpoint Protection volition at present automatically mitigate ane consequence on vulnerable Exchange Servers. Microsoft outlines the step in a security blog post (via ZDNet):

Today, nosotros have taken an additional step to further support our customers who are still vulnerable and have not yet implemented the complete security update. With the latest security intelligence update, Microsoft Defender Antivirus and System Center Endpoint Protection volition automatically mitigate CVE-2021-26855 on any vulnerable Commutation Server on which it is deployed. Customers exercise non need to take activity beyond ensuring they accept installed the latest security intelligence update (build one.333.747.0 or newer), if they do not already have automatic updates turned on.

Specifically, Microsoft Defender automatically mitigates CVE-2021-26855, which is a astringent vulnerability. It is one of 4 vulnerabilities related to the assault on Exchange servers.

Microsoft emphasizes that the Commutation security update is a meliorate style to protect servers:

The Commutation security update is still the nigh comprehensive mode to protect your servers from these attacks and others fixed in earlier releases. This interim mitigation is designed to aid protect customers while they have the fourth dimension to implement the latest Exchange Cumulative Update for their version of Exchange.

Contempo reports country that threat actors are increasing their attacks on vulnerable servers. People who manage servers should check to see if their systems accept been afflicted and take appropriate action to address whatever bug.

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