## Full WriteUp
Full Writeup on our website: [https://www.aperikube.fr/docs/inshack_2019/jean_seb_bash/](https://www.aperikube.fr/docs/inshack_2019/jean_seb_bash/)
## TL;DR
Use the decryption oracle to decrypt a random valid ciphertext. Modify the first block to produce a valid command in the second block.