Nahamsec Interviews Jobert Abma

Note that during these interviews I also moderate thus quality may vary.

Profile 🐝

Genesis when 13 years old
Visual Basics book
Website got defaced -> learned about hacking and perform hacking
Started company after graduating, worked for Dutch government and companies etc.

deep dive
read docs
ask questions
always be learning
take a lot of notes
what’s interesting -> defenses that are in place
read up on company -> what is impact for bug besides technical
look for one bug type at a time (a lot of work)
- helps you go deeper on each iteration
- better coverage
use knowledge for continuous integration

Never stop learning
Be eager to understand what you’re looking at
Focus on learning to keep you motivated
Focus on one target -> leverage information to find more
Use what you know
- GitLab uses similar stack as HackerOne
Pay for features once you feel confident in bug hunting
- Mention it in bug report for clarity and perhaps reimburstment or bonus
Attack surface not always in new additions but in deleted ones
IDOR
- Don’t use existing ID’s authorization is already in place
Beginners
- Hack your own code
  - sunny day vs rainy day
    - write test with random input for example
- Try all the things that you expect to go wrong
- Try to break it
- Think outside of the box
- Structure it for yourself and focus on learning
Security is thinking about defensive programming – anticipate tampering and how you handle these cases.
book atomic habits