On Patch Tuesday of last November, Microsoft released advisories to address several vulnerabilities in Active-Directory. Analysis of these vulnerabilities showed that by combining CVE-2021-42278 and CVE-2021-42287 it is possible, under default conditions, for a regular user to easily impersonate a domain admin. This means that any domain user can effectively become a domain administrator, which makes these vulnerabilities extremely severe. Moreover, there are already several Github repositories with free-to-use PoC code that facilitates the exploitation of these vulnerabilities.
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Rascals are always sociable, and the chief sign that a man has any nobility in his character is the little pleasure he takes in others company. Arthur Schopenhauer