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Home > Web Hosting > Patch for Microsoft Exchange vulnerability released

Patch for Microsoft Exchange vulnerability released

Microsoft patched an actively exploited high severity vulnerability that impacts Microsoft Exchange servers.

Erdem Yasar by Erdem Yasar
November 24, 2021
in Web Hosting
1 min read
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Microsoft released November 2021 security updates for Exchange Server that addresses actively exploited high severity vulnerabilities reported by security partners and found through Microsoft’s internal processes. Microsoft also admitted that one of these vulnerabilities (CVE-2021-42321) is currently under attack. It is a post-authentication vulnerability found in Exchange 2016 and 2019.

On-premises Microsoft Exchange Servers

Microsoft stated that these vulnerabilities affect on-premises Microsoft Exchange Server, including servers in Exchange Hybrid mode. However, Exchange Online users are safe and don’t need to take action against vulnerabilities. Microsoft also urged users to install the updates as soon as possible.

Approximately two weeks after Microsoft’s release, a cybersecurity researcher, published a proof-of-concept exploit for the high severity vulnerability.

As many ppl requested,
Here is the PoC of CVE-2021-42321, Exchange Post-Auth RCE
This PoC just pop mspaint.exe on the target, can be use to recognize the signature pattern of a successful attack event https://t.co/mTbOFz94qM

— Janggggg (@testanull) November 21, 2021

Users who want to check if any of your vulnerable Exchange servers have already been targeted by this vulnerability can run the following PowerShell query on each server to detect specific events:

Get-EventLog -LogName Application -Source "MSExchange Common" -EntryType Error | Where-Object { $_.Message -like "*BinaryFormatter.Deserialize*" }

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Erdem Yasar

Erdem Yasar

Erdem Yasar is a news editor at Cloud7 News. Erdem started his career by writing video game reviews in 2007 for PC World magazine while he was studying computer engineering. In the following years, he focused on software development with various programming languages. After his graduation, he continued to work as an editor for several major tech-related websites and magazines. During the 2010s, Erdem Yasar shifted his focus to cloud computing, hosting, and data centers as they were becoming more popular topics in the tech industry. Erdem Yasar also worked with various industry-leading tech companies as a content creator by writing blog posts and other articles. Prior to his role at Cloud7 News, Erdem was the managing editor of T3 Magazine.

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