Microsoft security advisory

Number: AV19-211
Date: 23 September 2019

On 23 September 2019 Microsoft released two out-of-band patches to address recently disclosed vulnerabilities in Internet Explorer and Windows Defender. These vulnerabilities are being tracked as CVE-2019-1367 and CVE-2019-1255, respectively.

The vulnerability VulnerabilityA flaw or weakness in the design or implementation of an information system or its environment that could be exploited to adversely affect an organization's assets or operations. in Internet Explorer could allow a remote, unauthenticated actor to run arbitrary code with the same privileges as the user.

The vulnerability in Windows Defender could allow an actor to cause a denial of service condition on the victim machine by preventing users from executing legitimate system binaries. It should be noted that the actor would first require execution privileges on the victim machine.

The Cyber Centre encourages users and administrators to review the appropriate Microsoft update webpages and apply the necessary updates:

Internet Explorer:https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1367

Windows Defender:https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1367

Note to Readers

The Canadian Centre for Cyber Security Cyber securityThe protection of digital information, as well as the integrity of the infrastructure housing and transmitting digital information. More specifically, cyber security includes the body of technologies, processes, practices and response and mitigation measures designed to protect networks, computers, programs and data from attack, damage or unauthorized access so as to ensure confidentiality, integrity and availability. (Cyber Centre) operates as part of the Communications Security Establishment. We are Canada’s national authority on cyber security and we lead the government’s response to cyber security events. As Canada's national computer security incident response team, the Cyber Centre works in close collaboration with government departments, critical infrastructure Critical infrastructureProcesses, systems, facilities, technologies, networks, assets, and services essential to the health, safety, security, or economic well-being of Canadians and the effective functioning of government. Critical infrastructure can be stand-alone or interconnected and interdependent within and across provinces, territories, and national borders. Disruptions of critical infrastructure could result in catastrophic loss of life, adverse economic effects, and significant harm to public confidence. , Canadian businesses and international partners to prepare for, respond to, mitigate, and recover from cyber events. We do this by providing authoritative advice and support, and coordinating information sharing and incident response. The Cyber Centre is outward-facing, welcoming partnerships that help build a stronger, more resilient cyber space in Canada.