The FBI this month reportedly issued an alert to its private industry partners, warning that a probable nation-state hacking group had recently compromised the networks of two U.S. municipalities via unpatched, vulnerable Microsoft SharePoint servers.

According to the report, from ZDNet, the flaw the hackers reportedly abused was CVE-2019-0604, a remote code execution bug caused by a failure to check the source markup of an application package. Microsoft began issuing patches for this vulnerability in March 2019.

The culprit reportedly exfiltrated user information, elevated privileges and dropped web shells, enabling them to gain remote access and establish persistence.

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