JFFS2 Firmware Modification - IoT Pentesting Tips and Tricks

In this video, I show a unique problem I encountered during an IoT pentest when trying to modify a JFFS2 filesystem on a flash chip with a smaller than usual eraseblock size.

random internet post about JFFS2 that help me:
https://alice.physi.uni-heidelberg.de/svn/Embedded_Systems/generic/mtd/branches/dcsboard/html/jffs2-eraseblocks.html

Need IoT pentesting or reverse engineering services?
Please consider Brown Fine Security:
https://brownfinesecurity.com/

IoT Hackers Hangout Community Discord Invite:
https://discord.com/invite/vgAcxYdJ7A

🛠️ Stuff I Use 🛠️

🪛 Tools:
Raspberry PI Pico: https://amzn.to/3XVMS3K
XGecu Universal Programmer: https://amzn.to/4dIhNWy
Multimeter: https://amzn.to/4b9cUUG
Power Supply: https://amzn.to/3QBNSpb
Oscilloscope: https://amzn.to/3UzoAZM
Logic Analyzer: https://amzn.to/4a9IfFu
USB UART Adapter: https://amzn.to/4dSbmjB
iFixit Toolkit: https://amzn.to/44tTjMB

🫠 Soldering & Hot Air Rework Tools:
Soldering Station: https://amzn.to/4dygJEv
Microsoldering Pencil: https://amzn.to/4dxPHwY
Microsoldering Tips: https://amzn.to/3QyKhrT
Rework Station: https://amzn.to/3JOPV5x
Air Extraction: https://amzn.to/3QB28yx

🔬 Microscope Setup:
Microscope: https://amzn.to/4abMMao
Microscope 0.7X Lens: https://amzn.to/3wrV1S8
Microscope LED Ring Light: https://amzn.to/4btqiTm
Microscope Camera: https://amzn.to/3QXSXsb

About Me:
My name is Matt Brown and I'm an Hardware Security Researcher and Bug Bounty Hunter. This channel is a place where I share my knowledge and experience finding vulnerabilities in IoT systems.

- Soli Deo Gloria

💻 Social:
website: https://brownfinesecurity.com/
twitter: https://twitter.com/nmatt0
linkedin: https://www.linkedin.com/in/mattbrwn/
github: https://github.com/nmatt0/

#hacking #iot #cybersecurity