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the stream

33C3 talk: Linux in my baseband?

Alexander Bochmann Sunday 05 of February, 2017
Ok, I missed this during 33C3: Harald Welte and Holger Freyther dissect a Quectel 3G/LTE modem that's based on the Qualcomm MDM9615 chipset...

The MDM9615 contains an ARM core that runs a bastardized Android kernel (including an adb shell) with busybox and OpenEmbedded userland, with lots of strange stuff that translates between the user-facing interface and the closed Qualcomm baseband core. A user can run programs on the ARM core using AT+QLINUXCMD... All the infrastructure (including firmware updates) is completely unprotected from manipulation...

Full talk on media.ccc.de: Dissecting modern (3G/4G) cellular modems

More info on the Osmocom wiki: http://osmocom.org/projects/quectel-modems/wiki