CISA Alerts

AA22-011A: Understanding and Mitigating Russian State-Sponsored Cyber Threats to U.S. Critical Infrastructure

Original release date: January 11, 2022 Summary Actions Critical Infrastructure Organizations Should Implement to Immediately Strengthen Their Cyber Posture. • Patch all systems. Prioritize patching known exploited vulnerabilities. • Implement multi-factor authentication. • Use antivirus software. • Develop internal contact lists and surge support. Note: this advisory uses the MITRE Adversarial Tactics, Techniques, and Common Knowledge …

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AA21-356A: Mitigating Log4Shell and Other Log4j-Related Vulnerabilities

Original release date: December 22, 2021 Summary The Cybersecurity and Infrastructure Security Agency (CISA), the Federal Bureau of Investigation (FBI), National Security Agency (NSA), Australian Cyber Security Centre (ACSC), Canadian Centre for Cyber Security (CCCS), the Computer Emergency Response Team New Zealand (CERT NZ), the New Zealand National Cyber Security Centre (NZ NCSC), and the …

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AA21-336A: APT Actors Exploiting CVE-2021-44077 in Zoho ManageEngine ServiceDesk Plus

Original release date: December 2, 2021 Summary This joint Cybersecurity Advisory uses the MITRE Adversarial Tactics, Techniques, and Common Knowledge (ATT&CK®) framework, Version 9. See the ATT&CK for Enterprise framework for referenced threat actor techniques and for mitigations. This joint advisory is the result of analytic efforts between the Federal Bureau of Investigation (FBI) and …

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AA21-321A: Iranian Government-Sponsored APT Cyber Actors Exploiting Microsoft Exchange and Fortinet Vulnerabilities in Furtherance of Malicious Activities

Original release date: November 17, 2021 Summary Actions to Take Today to Protect Against Iranian State-Sponsored Malicious Cyber Activity • Immediately patch software affected by the following vulnerabilities: CVE-2021-34473, 2018-13379, 2020-12812, and 2019-5591. • Implement multi-factor authentication. • Use strong, unique passwords. Note: this advisory uses the MITRE Adversarial Tactics, Techniques, and Common Knowledge (ATT&CK®) framework, …

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AA21-291A: BlackMatter Ransomware

Original release date: October 18, 2021 Summary Actions You Can Take Now to Protect Against BlackMatter Ransomware • Implement and enforce backup and restoration policies and procedures. • Use strong, unique passwords. • Use multi-factor authentication. • Implement network segmentation and traversal monitoring. Note: this advisory uses the MITRE Adversarial Tactics, Techniques, and Common Knowledge (ATT&CK®) …

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AA21-287A: Ongoing Cyber Threats to U.S. Water and Wastewater Systems

Original release date: October 14, 2021 Summary Immediate Actions WWS Facilities Can Take Now to Protect Against Malicious Cyber Activity • Do not click on suspicious links. • If you use RDP, secure and monitor it. • Use strong passwords. • Use multi-factor authentication. Note: This Alert uses the MITRE Adversarial Tactics, Techniques, and Common …

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AA21-265A: Conti Ransomware

Original release date: September 22, 2021 Summary Immediate Actions You Can Take Now to Protect Against Conti Ransomware • Use multi-factor authentication. • Segment and segregate networks and functions. • Update your operating system and software. Note: This Alert uses the MITRE Adversarial Tactics, Techniques, and Common Knowledge (ATT&CK®) framework, version 9. See the ATT&CK …

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AA21-259A: APT Actors Exploiting Newly Identified Vulnerability in ManageEngine ADSelfService Plus

Original release date: September 16, 2021 Summary This Joint Cybersecurity Advisory uses the MITRE Adversarial Tactics, Techniques, and Common Knowledge (ATT&CK®) framework, Version 8. See the ATT&CK for Enterprise for  referenced threat actor tactics and for techniques. This joint advisory is the result of analytic efforts between the Federal Bureau of Investigation (FBI), United States …

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AA21-229A: BadAlloc Vulnerability Affecting BlackBerry QNX RTOS

Original release date: August 17, 2021 Summary On August 17, 2021, BlackBerry publicly disclosed that its QNX Real Time Operating System (RTOS) is affected by a BadAlloc vulnerability—CVE-2021-22156. BadAlloc is a collection of vulnerabilities affecting multiple RTOSs and supporting libraries.[1] A remote attacker could exploit CVE-2021-22156 to cause a denial-of-service condition or execute arbitrary code …

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