Microsoft security advisory – September 2019 monthly rollup

Number: AV19-200
Date: 10 septembre 2019

On 10 September 2019 Microsoft released security updates to address multiple vulnerabilities affecting some of its products. This rollup provides fixes for several critical vulnerabilities, including vulnerabilities in its Remote Desktop Client (RDC) and Microsoft SharePoint.

The RDC vulnerabilities would allow for arbitrary code execution on the local machine if that machine was to connect to a compromised or malicious server using the RDC. There is no method of forcing a machine to connect to a server, although machines could be tricked into connecting through social engineering Social engineeringThe practice of obtaining confidential information by manipulation of legitimate users. A social engineer will commonly use the telephone or internet to trick people into revealing sensitive information. For example, phishing is a type of social engineering. campaigns or man-in-the-middle attacks.

Another critical 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. is in Microsoft SharePoint. This vulnerability could allow a remote actor to upload a specially crafted SharePoint application package to a vulnerable SharePoint server and run arbitrary code.

The Cyber Centre encourages users and administrators to review the Microsoft Security Updates webpage and apply the necessary updates:

https://portal.msrc.microsoft.com/en-us/security-guidance/releasenotedetail/24f46f0a-489c-e911-a994-000d3a33c573

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.

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