Organizations with unpatched Windows 10 systems in their inventory now have an extra-large target on their corporate backs. According to a new alert from the Cybersecurity and Infrastructure Security Agency (CISA), an agency of the Department of Homeland Security, the target is in the shape of CVE-2020-0796 due to new proof-of-concept exploit code posted to GitHub.
The vulnerability is in the Microsoft Server Message Block 3.1.1 (SMBv3) protocol, a protocol used to allow Windows to communicate with a variety of devices. The vulnerability exploit, called SMBGhost, could allow an attacker to execute arbitrary code on the targeted server. To make matters worse, the exploit is "wormable," meaning that it can use infected hosts to spread copies of the exploit across an organization's network.
Microsoft issued a patch for CVD-2020-0796 in March, but tens of thousands of Windows 10 computers remain unpatched around the world. The release of the proof of concept into the wild means that these unpatched systems have made their owners victims-in-waiting. The DHS and Microsoft each urge owners to update their systems immediately.