KLA12342 Multiple vulnerabilities in Microsoft Server Software

Multiple vulnerabilities were found in Microsoft Server Software. Malicious users can exploit these vulnerabilities to perform cross-site scripting attack, execute arbitrary code, spoof user interface.

Below is a complete list of vulnerabilities:

1. A spoofing vulnerability in Microsoft Exchange Server can be exploited remotely to spoof user interface.
2. A remote code execution vulnerability in Microsoft Exchange Server can be exploited remotely to execute arbitrary code.

Original advisories

CVE-2021-41349

CVE-2021-42321

CVE-2021-42305

Exploitation

Public exploits exist for this vulnerability.

Malware exists for this vulnerability. Usually such malware is classified as Exploit. More details.

Related products

Microsoft-Exchange-Server

CVE list

CVE-2021-41349 high

CVE-2021-42321 critical

CVE-2021-42305 high

KB list

5007409

Solution

Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)

Impacts

• ACE

Arbitrary code execution. Exploitation of vulnerabilities with this impact can lead to executing by abuser any code or commands at vulnerable machine or process.

• XSS/CSS

Cross site scripting. Exploitation of vulnerabilities with this impact can lead to partial interception of information transmitted between user and site.

• SUI

Spoof user interface. Exploitation of vulnerabilities with this impact can lead to changes in user interface to beguile user into inaccurate behavior.

Affected Products

• Microsoft Exchange Server 2019 Cumulative Update 10Microsoft Exchange Server 2019 Cumulative Update 11Microsoft Exchange Server 2013 Cumulative Update 23Microsoft Exchange Server 2016 Cumulative Update 22Microsoft Exchange Server 2016 Cumulative Update 21