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    Home » CrowdStrike’s faulty update crashed 8.5 million Windows devices, says Microsoft
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    CrowdStrike’s faulty update crashed 8.5 million Windows devices, says Microsoft

    News RoomBy News RoomJuly 20, 20242 Mins Read
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    CrowdStrike’s faulty update caused a worldwide tech disaster that affected 8.5 million Windows devices on Friday, according to Microsoft. Microsoft says that’s “less than one percent of all Windows machines,” but it was enough to create problems for retailers, banks, airlines, and many other industries, as well as everyone who relies on them.

    CrowdStrike’s breakdown explains the configuration file that was at the heart of the issue:

    The configuration files mentioned above are referred to as “Channel Files” and are part of the behavioral protection mechanisms used by the Falcon sensor. Updates to Channel Files are a normal part of the sensor’s operation and occur several times a day in response to novel tactics, techniques, and procedures discovered by CrowdStrike. This is not a new process; the architecture has been in place since Falcon’s inception.

    CrowdStrike explained that the file is not a kernel driver but is responsible for “how Falcon evaluates named pipe1 execution on Windows systems.” Security researcher and Objective See founder Patrick Wardle says that the explanation aligns with the earlier analysis he and others provided about the cause of the crash, as the problem file “C-00000291- “triggered a logic error that resulted in an OS crash” (via CSAgent.sys).”

    Other excerpts from CrowdStrike’s blog explain more about what went wrong:

    On July 19, 2024 at 04:09 UTC, as part of ongoing operations, CrowdStrike released a sensor configuration update to Windows systems. Sensor configuration updates are an ongoing part of the protection mechanisms of the Falcon platform. This configuration update triggered a logic error resulting in a system crash and blue screen (BSOD) on impacted systems.

    And which systems were affected and when:

    Systems running Falcon sensor for Windows 7.11 and above that downloaded the updated configuration from 04:09 UTC to 05:27 UTC – were susceptible to a system crash.

    CrowdStrike’s channel file updates were pushed to computers regardless of any settings meant to prevent such automatic updates, Wardle noted.

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