CVE-2020-16875

A remote code execution vulnerability exists in Microsoft Exchange server due to improper validation of cmdlet arguments.

An attacker who successfully exploited the vulnerability could run arbitrary code in the context of the System user. Exploitation of the vulnerability requires an authenticated user in a certain Exchange role to be compromised.

The security update addresses the vulnerability by correcting how Microsoft Exchange handles cmdlet arguments.

Recent assessments:

ccondon-r7 at September 09, 2020 6:14pm UTC reported:

There’s more info in Rapid7’s analysis here, but as @tsellers-r7 and**@smcintyre-r7** pointed out privately today, need for authenticated session + exposed PowerShell endpoint + user who belongs to specific Exchange groups = less opportunity for wide-scale attacks than something like February’s Exchange vuln. I’m interested to see how Steven Seeley’s exploit works if he releases it, though. Might be cause for quick re-evaluation.

Assessed Attacker Value: 5
Assessed Attacker Value: 5Assessed Attacker Value: 4