Number: AV20-300
Date: 12 August 2020
On 11 August 2020 Microsoft released security updates to address vulnerabilities in multiple products. Included were critical patches for the following:
- ChakraCore
- Internet Explorer 11
- .NET Framework
- Microsoft Outlook
- Microsoft Edge (EdgeHTML-based)
- Microsoft Windows
- Microsoft Windows Server
Of note are two zero-day vulnerabilities that Microsoft has reported as being actively exploited and have since been patched. CVE-2020-1380 is a remote code execution vulnerability in Internet Explorer 11 that could allow a malicious actor to execute arbitrary code in the context of the current user. CVE-2020-1464 is the result of incorrect validation of file signatures in Windows and could allow a malicious actor to bypass security features and load improperly signed files.
The Cyber Centre encourages users and administrators to review the following web links and apply the necessary updates as soon as possible.
https://portal.msrc.microsoft.com/en-us/security-guidance
August 2020 Release Notes
https://portal.msrc.microsoft.com/en-us/security-guidance/releasenotedetail/2020-Aug
Note to Readers
The Canadian Centre for Cyber Security (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, 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.