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Zero-Day Vulnerability Affecting Microsoft Exchange Server

Zero-Day Vulnerability Affecting Microsoft Exchange Server


Security researchers have discovered two zero-day vulnerabilities (CVE-2022-41040 and CVE-2022-41082) affecting Microsoft Exchange Server 2013, 2016 and 2019. These vulnerabilities are reportedly being actively exploited in the wild.

Successful exploitation of the vulnerability could allow an authenticated attacker to perform unauthorized remote code execution (RCE) on a compromised system.

A patch for the vulnerability is not currently available. As a workaround, system administrators of affected on-premises Microsoft Exchange servers can use the Internet Information Services (IIS) server’s URL Rewrite Rules module to add a rule to block requests that indicate an attack and publish We recommend that you block the remote PowerShell ports that are ( HTTP: 5985 and HTTPS: 5986 ) as soon as possible until a patch is available.

Microsoft has confirmed that system administrators can refer to the following URL rewriting instructions to break the current attack chain.

Open IIS Manager. Expand Default Web Site. Select Auto Detect. In function view,[URL 書き換え]Click.Right[操作]in the window,[ルールの追加]Click.[リクエストのブロック]and select[OK]Click. Add the string “.*autodiscover\.json.*\@.*Powershell.*” (without quotes) and[OK]Click. Expand the rules, select the rule with the pattern “.*autodiscover\.json.*\@.*Powershell.*”,[条件]and[編集]Click. Change the condition input from {URL} to {REQUEST_URI}.

System administrators may also consider running the following PowerShell command to search IIS logs to determine if their Exchange server has been compromised by a zero-day vulnerability.

Get-ChildItem -Recurse -Path -Filter “*.log” | Select-String -Pattern ‘powershell.*autodiscover\.json.*\@.*200

System administrators are encouraged to visit Microsoft’s website for updated detection technology and patches for the vulnerability.

For more information, see:

Customer Guidance for Reported Zero-day Vulnerabilities in Microsoft Exchange Server




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