Microsoft confirms new Exchange zero-days are used in attacks
Microsoft has confirmed that two recently reported zero-day vulnerabilities in Microsoft Exchange Server 2013, 2016, and 2019 are being exploited in the wild. [...]
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Background for this topic.
Exchange Server is a Microsoft server platform for organizational email, calendars, contacts, and mailbox storage. It may run within an organization or as part of a hybrid environment, and commonly exposes web, mail-transfer, and administration interfaces. Because it stores business communications and can mediate access to accounts, it is a high-value system for security teams.
Security concerns include exploitation of vulnerabilities in internet-facing services, theft or misuse of privileged accounts, and unauthorized mailbox access through weak authentication or compromised credentials. Protection requires prompt, tested security updates; minimizing and monitoring external exposure; strong authentication for administrators and remote access; and careful separation of administrative privileges. Logs from web access, authentication, mailbox activity, and mail flow support detection and investigation. Organizations should also maintain tested backups and recovery procedures, while applying retention, access-control, and privacy requirements to stored messages and attachments.
Microsoft has confirmed that two recently reported zero-day vulnerabilities in Microsoft Exchange Server 2013, 2016, and 2019 are being exploited in the wild. [...]