Apple Security Update

Number: AV17-178
Date: 29 November 2017


The purpose of this advisory is to bring attention to an Apple system security update for macOS High Sierra.


A flaw in macOS High Sierra allows a user to log in to the root account of a computer that uses this operating system. A user may be able to bypass administrator authentication without supplying the administrator’s password.

Apple has released the following support article:

This update addresses vulnerabilities on the system listed above.

CVE Reference: CVE-2017-13872

Suggested action

CCIRC recommends that system administrators test and deploy the vendor-released updates to affected applications accordingly.


Note to Readers

In support of Public Safety's mission to build a safe and resilient Canada, CCIRC's mandate is to help ensure the security and resilience of the vital non-federal government cyber systems that underpin Canada's national security, public safety and economic prosperity. As Canada's computer security incident response team, CCIRC is Canada's national coordination centre for the prevention and mitigation of, preparedness for, response to, and recovery from cyber incidents on non-federal government systems. It does this by providing authoritative advice and support, and coordinating information sharing and incident response.

Please note, CCIRC PGP key has recently been updated.

For general information, please contact Public Safety Canada's Public Affairs division at:

Telephone: 613-944-4875 or 1-800-830-3118
Fax: 613-998-9589

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