The DGSE (Direction Générale de la Sécurité Extérieure) and another french engineer school Mines Telecom Paris Sud have organized a cybersecurity challenge in May 2022. Many challenges were presents for cyber passionates to evaluate their skills by resolving them and capturing the flag to earn points. Write ups of successful challenges are presented here.

Here are the write-ups of the challenges I have succeded:

• Floppy (Disk Analysis)
• Un Agent Compromis (DNS Exfiltration)

• Trop Facile (Buffer Overflow)
• Sans Protection (Return to Stack)
• Cache Cache (Format String Vulnerability)
• Patchwork (Return to Libc)

• Collaborateur Suspect
• Nous sommes infiltrés !