Microsoft Exchange Validation Key Remote Code Execution Vulnerability
CVE-2020-0688 is fixed in 6 products on 1 platform, first by KB4536989, released February 11, 2020. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on November 3, 2021, with known ransomware use. Patch Radar priority: Patch now.
<p>A remote code execution vulnerability exists in Microsoft Exchange Server when the server fails to properly create unique keys at install time.</p> <p>Knowledge of a the validation key allows an authenticated user with a mailbox to pass arbitrary objects to be deserialized by the web application, which runs as SYSTEM.</p> <p>The security update addresses the vulnerability by correcting how Microsoft Exchange creates the keys during install.</p>
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Microsoft | |||
| Microsoft Exchange Server 2010 Service Pack 3 Update Rollup 30 | KB4536989 | Feb 11, 2020 | |
| Microsoft Exchange Server 2013 Cumulative Update 23 | KB4536988 | Feb 11, 2020 | |
| Microsoft Exchange Server 2016 Cumulative Update 14 | KB4536987 | Feb 11, 2020 | |
| Microsoft Exchange Server 2016 Cumulative Update 15 | KB4536987 | Feb 11, 2020 | |
| Microsoft Exchange Server 2019 Cumulative Update 3 | KB4536987 | Feb 11, 2020 | |
| Microsoft Exchange Server 2019 Cumulative Update 4 | KB4536987 | Feb 11, 2020 | |
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