The US-CERT Current Activity web page is a regularly updated summary of the most frequent, high-impact types of security incidents currently being reported to the US-CERT.

MS-ISAC Releases Cybersecurity Advisory on Zyxel Firewalls and AP Controllers

The Multi-State Information Sharing and Analysis Center (MS-ISAC) has released an advisory on a vulnerability in Zyxel firewalls and AP controllers. A remote attacker could exploit this vulnerability to take control of an affected system.

Mozilla Releases Security Updates for Firefox, Firefox for Android, and Firefox ESR

Mozilla has released security updates to address a vulnerability in Firefox, Firefox for Android, and Firefox ESR. An attacker could exploit this vulnerability to take control of an affected system.  

CISA encourages users and administrators to review the Mozilla Security Advisory and apply the necessary updates.

Google Releases Security Updates for Chrome

Google has released Chrome version 87.0.4280.141 for Windows, Mac, and Linux. This version addresses vulnerabilities that an attacker could exploit to take control of an affected system.

CISA encourages users and administrators to review the Chrome Release and apply the necessary updates.

CISA Updates Emergency Directive 21-01 Supplemental Guidance and Activity Alert on SolarWinds Orion Compromise

CISA has released Emergency Directive (ED) 21-01 Supplemental Guidance version 3: Mitigate SolarWinds Orion Code Compromise, providing guidance that supersedes Required Action 4 of ED 21-01 and Supplemental Guidance versions 1 and 2.

NSA Releases Guidance on Eliminating Obsolete TLS Protocol Configurations

The National Security Agency (NSA) has released a Cybersecurity Information (CSI) sheet on eliminating obsolete Transport Layer Security (TLS) configurations. The information sheet identifies strategies to detect obsolete cipher suites and key exchange mechanisms, discusses recommended TLS configurations, and provides remediation recommendations for organizations using obsolete TLS configurations.

CISA Releases Free Detection Tool for Azure/M365 Environment

CISA has created a free tool for detecting unusual and potentially malicious activity that threatens users and applications in an Azure/Microsoft O365 environment. The tool is intended for use by incident responders and is narrowly focused on activity that is endemic to the recent identity- and authentication-based attacks seen in multiple sectors.

CISA strongly encourages users and administrators to visit the following GitHub page for additional information and detection countermeasures.