Introduction to IoT Reverse Engineering
summary
Hands-on firmware reverse engineering of a D‑Link router with firmware from ADB: identifies an ARM Cortex‑A9 1GHz, 256MB RAM, 256MB NAND device, extracts JFFS2 (LZMA) rootfs with binwalk and jefferson, builds an emulation image using QEMU vexpress‑a9 + Buildroot (2014), runs sig_verify under gdb to inspect libcrypto calls and reconstruct the public key but cannot recover the private key, pivots to on‑device escalation via a CM management XML trick, edits rootfs, and finally loads unsigned firmware by using a bind‑mount to replace the upgrade script so the update succeeds.
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chapters (11)
- 0:00Introduction to IoT reverse engineering
- 1:08What is reverse engineering
- 2:34Information gathering process
- 8:20Repurposing interfaces
- 10:05Extracting firmware files
- 17:16Building emulation environment
- 23:23Analyzing firmware upgrade
- 26:11Bypassing signature checks
- 30:07Gaining root access
- 35:31Modifying the firmware
- 38:05Conclusion and resources
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