AlertsMicrosoft Security Advisory

Number: AV21-352
Date: 22 July 2021

On 20 July 2021 Microsoft published an out-of-band Security Advisory to address a vulnerability in the following product:

  • Windows 10 – versions 1809 and later

Exploitation of this vulnerability could allow an actor with the ability to execute code on a victim system to obtain sensitive system information and elevate privileges.

The Cyber Centre encourages users and administrators to review the provided web links, perform the suggested mitigation after verifying potential business impacts and apply the necessary updates when available.

Windows Elevation of Privilege Vulnerability (CVE-2021-36934)
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2021-36934

Microsoft Windows 10 gives unprivileged user access to SAM, SYSTEM, and SECURITY files
https://www.kb.cert.org/vuls/id/506989

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.

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