US CERT: Current Activity

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A regularly updated summary of the most frequent, high-impact security incidents currently being reported to the US-CERT.
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2021. január 21.

Cisco Releases Advisories for Multiple Products

Original release date: January 21, 2021

Cisco has released security updates to address vulnerabilities in multiple Cisco products. A remote attacker could exploit these vulnerabilities to take control of an affected system. For updates addressing lower severity vulnerabilities, see the Cisco Security Advisories page.

CISA encourages users and administrators to review the following Cisco Advisories and apply the necessary updates:

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 21.

Drupal Releases Security Updates

Original release date: January 21, 2021

Drupal has released security updates to address a vulnerability affecting Drupal. An attacker could exploit this vulnerability to take control of an affected system.

CISA encourages users and administrators to review Drupal Advisory SA-CORE-2021-001 and apply the necessary updates or mitigations.

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 21.

CERT/CC and CISA Report Multiple Vulnerabilities in Dnsmasq

Original release date: January 21, 2021

CISA and the CERT Coordination Center (CERT/CC) are aware of multiple vulnerabilities affecting Dnsmasq version 2.82 and prior. Dnsmasq is a widely-used, open-source software that provides Domain Name Service forwarding and caching and is common in Internet-of-Things (IoT) and other embedded devices. A remote attacker could exploit some of these vulnerabilities to take control of an affected system.

CISA encourages users and vendors of IoT and embedded devices that use Dnsmasq to review CERT/CC VU#434904 and CISA ICSA-21-019-01 21 for more information and to apply the necessary update. Refer to vendors for appropriate patches, when available.

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 21.

Google Releases Security Updates for Chrome

Original release date: January 21, 2021

Google has released Chrome version 88.0.4324.96 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.

 

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 21.

Oracle Releases January 2021 Security Bulletin

Original release date: January 21, 2021

Oracle has released its Critical Patch Update for January 2021 to address 329 vulnerabilities across multiple products. A remote attacker could exploit some of these vulnerabilities to take control of an affected system.

CISA encourages users and administrators to review the Oracle January 2021 Critical Patch Update and apply the necessary updates.

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 15.

NSA Releases Guidance on Encrypted DNS in Enterprise Environments  

Original release date: January 15, 2021

The National Security Agency (NSA) has released an information sheet with guidance on adopting encrypted Domain Name System (DNS) over Hypertext Transfer Protocol over Transport Layer Security (HTTPS), referred to as DNS over HTTPS (DoH). When configured appropriately, strong enterprise DNS controls can help prevent many initial access, command and control, and exfiltration techniques used by threat actors.

CISA encourages enterprise owners and administrators to review the NSA Info Sheet: Adopting Encrypted DNS in Enterprise Environments and consider implementing the recommendations to enhance DNS security.

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 15.

Apache Releases Security Advisory for Tomcat

Original release date: January 15, 2021

The Apache Software Foundation has released a security advisory to address a vulnerability affecting multiple versions of Apache Tomcat. An attacker could exploit this vulnerability to obtain sensitive information.   

CISA encourages users and administrators to review the Apache security advisory for CVE-2021-24122 and upgrade to the appropriate version.  

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 14.

RCE Vulnerability Affecting Microsoft Defender

Original release date: January 14, 2021

Microsoft has released a security advisory to address a remote code execution vulnerability, CVE-2021-1647, in Microsoft Defender. A remote attacker can exploit this vulnerability to take control of an affected system. This vulnerability was detected in exploits in the wild.

CISA encourages users and administrators to review Microsoft Advisory for CVE-2021-1647 and apply the necessary updates. 

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 14.

Cisco Releases Security Updates for Multiple Products

Original release date: January 14, 2021

Cisco has released security updates to address vulnerabilities in Cisco products. A remote attacker could exploit some of these vulnerabilities to take control of an affected system. For updates addressing lower severity vulnerabilities see the Cisco Security Advisories page.

CISA encourages users and administrators to review the following Cisco Advisories and apply the necessary updates:

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 14.

Juniper Networks Releases Security Updates for Multiple Products

Original release date: January 14, 2021

Juniper Networks has released security updates to address vulnerabilities affecting multiple products. An attacker could exploit some of these vulnerabilities to cause take control of an affected system.

CISA encourages users and administrators to review the Juniper Networks security advisories page and apply the necessary updates.

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 13.

Attackers Exploit Poor Cyber Hygiene to Compromise Cloud Security Environments

Original release date: January 13, 2021

CISA is aware of several recent successful cyberattacks against various organizations’ cloud services. Threat actors used a variety of tactics and techniques, including phishing and brute force logins, to attempt to exploit weaknesses in cloud security practices.

In response, CISA has released Analysis Report AR21-013A: Strengthening Security Configurations to Defend Against Attackers Targeting Cloud Services which provides technical details and indicators of compromise to help detect and respond to potential attacks.

CISA encourages users and administrators to review AR21-013A and apply the recommendations to strengthen cloud environment configurations.

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 12.

Microsoft Releases January 2021 Security Updates

Original release date: January 12, 2021

Microsoft has released updates to address multiple vulnerabilities in Microsoft software. A remote attacker can exploit some of these vulnerabilities to take control of an affected system.

CISA encourages users and administrators to review Microsoft’s January 2021 Security Update Summary and Deployment Information and apply the necessary updates.

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 12.

NSA Cybersecurity Directorate Releases 2020 Year in Review

Original release date: January 12, 2021

The National Security Agency (NSA) Cybersecurity Directorate has released its 2020 Year in Review, outlining key milestones and mission outcomes achieved during NSA Cybersecurity’s first full year of existence. Highlights include NSA Cybersecurity’s contributions to the 2020 elections, Operation Warp Speed, and the Department of Defense’s pandemic-influenced transition to telework.

For further details on those and other accomplishments, CISA encourages users and administrators to read the NSA Cybersecurity 2020 Year in Review.

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 12.

Mozilla Releases Security Update for Thunderbird

Original release date: January 12, 2021

Mozilla has released a security update to address a vulnerability in Thunderbird. An attacker could exploit this vulnerability to take control of an affected system.  

CISA encourages users and administrators to review the Mozilla Security Advisory for Thunderbird 78.6.1 and apply the necessary update.

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 12.

Adobe Releases Security Updates for Multiple Products

Original release date: January 12, 2021

Adobe has released security updates to address vulnerabilities in multiple Adobe products. An attacker could exploit some of these vulnerabilities to take control of an affected system.

CISA encourages users and administrators to review the following Adobe Security Bulletins and apply the necessary updates.

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 12.

SAP Releases January 2021 Security Updates

Original release date: January 12, 2021

SAP has released security updates to address vulnerabilities affecting multiple products. An attacker could exploit some of these vulnerabilities to take control of an affected system.

CISA encourages users and administrators to review the SAP Security Notes for January 2021 and apply the necessary updates.

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 11.

Microsoft Releases Security Updates for Edge

Original release date: January 11, 2021

Microsoft has released a security update to address multiple vulnerabilities in Edge (Chromium-based). An attacker could exploit some of these vulnerabilities to take control of an affected system.  

CISA encourages users and administrators to review the latest entry for Microsoft Security Advisory ADV200002 and apply the necessary updates. 

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 8.

CISA Releases New Alert on Post-Compromise Threat Activity in Microsoft Cloud Environments and Tools to Help Detect This Activity

Original release date: January 8, 2021

CISA has evidence of post-compromise advanced persistent threat (APT) activity in the cloud environment. Specifically, CISA has seen an APT actor using compromised applications in a victim’s Microsoft 365 (M365)/Azure environment and using additional credentials and Application Programming Interface (API) access to cloud resources of private and public sector organizations. This activity is in addition to what has been previously detailed in AA20-352A.

In response, CISA has released AA21-008A: Detecting Post-Compromise Threat Activity in Microsoft Cloud Environments to describe this malicious APT activity and offer guidance on three open-source tools—including a CISA-developed tool, Sparrow, released on December 24. Network defenders can use these tools to help detect and remediate malicious APT actor activity as part of the ongoing supply chain compromise.

CISA strongly encourages users and administrators to review the Activity Alert for additional information and detection countermeasures.

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 8.

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

Original release date: January 8, 2021

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.

CISA encourages users and administrators to review the MS-ISAC Advisory 2021-001 and Zyxel Security Advisory for CVE-2020-29583 and apply the necessary updates and mitigation recommendations.

This product is provided subject to this Notification and this Privacy & Use policy.

2021. január 7.

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

Original release date: January 7, 2021

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.

This product is provided subject to this Notification and this Privacy & Use policy.