| CTF | Infobahn CTF 2025 (CTFtime) |
| Author | 0xM4hm0ud |
| Category | Beginner |
| Solves | 29 |
| Files | handout.zip |
There are no bound checks when editing a book. You can use negative or positive indexes. There is a callback pointer saved somewhere in the binary. You can edit it and change it to GetFlag. After overwriting, you can get the flag with option 5.
See solve.py.