SAFETY DECISION

Task: Evaluate three claims using the linked records, then choose a control that addresses replay. Read the operations note for the incident handoff context.

Evidence locker

operations-note.txt incident-events.json update-server.log vendor-bulletin.txt cloud-config.json firmware-strings.txt telemetry.jsonl

FINDING OPEN

Classify all three claims and select one evidence observation for each. Supported means the records establish the claim; contradicted means they conflict with it; not established means they do not justify it. Then choose one replay control. The event index is a reference; no event-ID sequence is required.

The matching checksum establishes that the vendor authorized this update.

Sources: update-server.log, vendor-bulletin.txt

Verdict

Evidence observationSensor-bus and probe health checks passed after installation.The digest matches, the signature block is absent, and vendor policy requires a trusted release signature.The target model matched and the install transaction was accepted.

The exposed diagnostic token proves someone could publish telemetry.

Sources: cloud-config.json, firmware-strings.txt

Verdict

Evidence observationThe diagnostic token is embedded in firmware and shared across a device group.The station is enabled and publishes telemetry every 60 seconds.The token has station-diagnostics:write scope; telemetry uses device-certificate authentication.

The repeated message provides a fresh measurement because it arrived later.

Sources: telemetry.jsonl, operations-note.txt

Verdict

Evidence observationBoth R14-0087 records have the same sensor time, sequence, payload and MAC, but different receipt times.The repeated record carries a quality value of ok.The second receipt timestamp is later than the first.

Which change addresses acceptance of repeated telemetry as fresh?Rotate the diagnostic upload token.Recalculate the update package checksum.Verify authenticated sequence numbers or timestamps against previously accepted messages; reject duplicates and stale readings.Reboot and wait for another normal reading.

SAFETY DECISION

Evidence locker

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