Microsoft explains why Teams, Xbox Live, and Office 365 went down this week

Earlier this week, an Azure Active Directory outage caused several major Microsoft services to get down, including Teams, Xbox Live, and Office 365. The outage impacted hundreds of millions of people who rely on the services for work, pedagogy, and amusement. Microsoft recently published a preliminary root crusade anaylsis for the outage (via ZDNet.

Here is Microsoft's summary of the cause of the outage:

Preliminary Root Crusade: The preliminary assay of this incident shows that an mistake occurred in the rotation of keys used to support Azure AD'south use of OpenID, and other, Identity standard protocols for cryptographic signing operations. As function of standard security hygiene, an automated system, on a time-based schedule, removes keys that are no longer in use. Over the last few weeks, a particular fundamental was marked as "retain" for longer than normal to support a complex cross-cloud migration. This exposed a issues where the automation incorrectly ignored that "retain" state, leading it to remove that item key.

Metadata about the signing keys is published by Azure AD to a global location in line with Net Identity standard protocols. One time the public metadata was changed at xix:00 UTC, applications using these protocols with Azure AD began to selection up the new metadata and stopped trusting tokens/assertions signed with the key that was removed. At that point, end users were no longer able to access those applications.

The crux of the issue was an error surrounding keys. A fundamental was marked as "retain" for longer than normal, which exposed a bug that acquired the "retain" state to be ignored. The key was removed when information technology shouldn't have been, which acquired the issues.

Microsoft is working on a multi-phase attempt to forbid these types of bug. Correct now, Microsoft is in the second phase of that process. Microsoft explains the try in the same post:

Azure AD is in a multi-phase try to apply additional protections to the backend Safe Deployment Procedure (SDP) system to prevent a course of risks including this trouble. The first phase does provide protections for adding a new key, just the remove key component is in the second stage which is scheduled to be finished past mid-twelvemonth. A previous Azure Advertizement incident occurred on September 28th, 2022 and both incidents are in the course of risks that will be prevented once the multi-stage SDP effort is completed.

Microsoft outlines its upcoming steps, which should forestall these types of outages once finished. Microsoft has put additional safeguards in place to assist prevent outages until the second stage of its effort is consummate.

Microsoft will publish a full root cause assay of the outage once its investigation is complete.

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Source: https://www.windowscentral.com/microsoft-explains-why-teams-xbox-live-and-office-365-went-down-week

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