Feds issue emergency order for agencies to patch critical Windows flaw

Agencies that don’t update must disconnect all domain controllers from networks. …

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The US Department of Homeland Security is giving federal agencies until midnight on Tuesday to patch a critical Windows vulnerability that can make it easy for attackers to become all-powerful administrators with free rein to create accounts, infect an entire network with malware, and carry out similarly disastrous actions.

Zerologon, as researchers have dubbed the vulnerability, allows malicious hackers to instantly gain unauthorized control of the Active Directory. An Active Directory stores data relating to users and computers that are authorized to use email, file sharing, and other sensitive services inside large organizations. Zerologon is tracked as CVE-2020-1472. Microsoft published a patch last Tuesday.

An unacceptable risk

The flaw, which is present in all supported Windows server versions, carries a critical severity rating from Microsoft as well as a maximum of 10 under the Common Vulnerability Scoring System. Further raising that stakes was the release by multiple researchers of proof-of-concept exploit code that could provide a roadmap for malicious hackers to create working attacks.

Officials with the Cybersecurity and Infrastructure Security Agency, which belongs to the DHS, issued an emergency directive on Friday that warned of the potentially severe consequences for organizations that don’t patch. It states:

CISA has determined that this vulnerability poses an unacceptable risk to the Federal Civilian Executive Branch and requires an immediate and emergency action. This determination is based on the following: