Date: 2017-04-09 08:49 am (UTC)
ewx: (Default)
From: [personal profile] ewx
Without having looked inside the signed images at all and only having superficially looked at version_info.json, I don't see anything that obviously contributes to freshness checking; if this is indeed missing then it might be possible for an attacker to silently prevent legitimates updates reaching the device or (depending what other checks are done elsewhere) roll firmware back.
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Matthew Garrett

About Matthew

Power management, mobile and firmware developer on Linux. Security developer at Google. Ex-biologist. @mjg59 on Twitter. Content here should not be interpreted as the opinion of my employer.

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