Microsoft released security updates to fix a remote code execution vulnerability in
Exchange Server. The related knowledge base article is KB4018588.
More information is contained in the following Common Vulnerabilities and Exposures articles:
- CVE-2017-8521 – Scripting Engine Memory Corruption Vulnerability
- CVE-2017-8559 – Microsoft Exchange Cross-Site Scripting Vulnerability
- CVE-2017-8560 – Microsoft Exchange Cross-Site Scripting Vulnerability
Depending on the lifecycle status of the product, fixes are made available either through a Rollup or as a security fix for the following product levels:
As you might notice, the security fix is made available for the N-1 builds of Exchange 2013 and Exchange 2016. This could imply the issue was addressed in the latest builds of those products. I hope to receive official confirmation on this soon.
The issue is deemed Important, which means organizations are advised to apply these updates at the earliest opportunity. However, as with any update, it is recommended to thoroughly test updates and fixes prior to deploying them in a production environment.
Microsoft announced the release of four new edX online training courses for Microsoft Exchange Server 2016. If you plan to implement Exchange Server 2016 or Exchange Online, or if you want to make sure that your implementation was done right, the Exchange Server 2016 online training courses are for you.
Course offerings include:
Each Exchange course is targeted to the IT professional audience, with hands-on labs that reinforce student learning. Students are graded on completing each module, as well as on module assessment exams and a final course exam. A Certificate can be earned by completing each course with a passing grade. Courses are self-paced, allowing IT professionals to build Exchange skills at their own pace as their schedules permit.
The first course, CLD208.1x: Microsoft Exchange Server 2016 Infrastructure, is free. The remaining three courses are for-fee courses at $49 USD per course.
edX is a massive open online course (MOOC) provider that was developed by MIT and Harvard University. The Microsoft Learning Experiences team has created a wide range of online training courses for edX, and these four Exchange courses are the team’s latest Office releases. They are the first of seven courses that cover the core skills an Exchange administrator needs to proficiently design, implement and manage an Exchange 2016 and Exchange Online implementation.
Consider the following scenario that takes Microsoft Exchange Server 2013 as an example:
- The Mailbox server role is enabled in Exchange Server 2013.
- Exchange mailboxes use extended MAPI to communicate with the Exchange Server.
- The extended MAPI uses Microsoft RPC over HTTP (remote procedure call over HTTP) protocol.
- Many clients (such as mobile devices) are dropping connections to the Exchange Server.
In this scenario, the CPU usage on the Exchange server may reach 100 percent.\