In addition to that, these vulnerable servers provide direct access to a great number of user hashes/passwords and email inbox contents of the entire organization. This default configuration does not employ the principle of least privilege and is made even more dangerous as these web applications are created with the intent to be exposed to the public internet and not protected by other basic means like network access control lists. “Running as a low-privileged account is a good security practice because then a software bug can't be used by a malicious user to take over the whole system.”īecause this service runs with the highest level of permission by default, it should be hardened and receive additional levels of monitoring. One of the major reasons these latest vulnerabilities are so dangerous and appealing to attackers is that they allow them to go directly from the public internet to executing processes as SYSTEM, the most privileged user, on the victim's system. In recent weeks, there has been quite a lot of reporting on the exploitation of the latest disclosed vulnerabilities in Microsoft’s Exchange Server by an attacker referred to as HAFNIUM.
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