Capture The Flag

This page includes a list of Capture The Flag (CTF) challenges I've authored since 2019.

CTF challenges

Challenges 2024

  • hxp_silicon_foundaries_hack1 | miscellaneous, cryptography | ctftime | download | writeup

    Exploitation of the Xor-Encrypt cipher mode in first AMD SME, SEV implementations

  • hxp_silicon_foundaries_hack2 | miscellaneous, exploitation | ctftime | download | writeup

    Exploitation of the lack of confidentiality and integrity of registers in AMD SEV

  • hxp_silicon_foundaries_hack3 | exploitation | ctftime | download | writeup

    Exploitation of the lack of memory integrity of AMD SEV

  • hxp_silicon_foundaries_hack4 | exploitation | ctftime | download | writeup

    QEMU VM-escape through various bugs in a custom CPU extension

  • suboptimal_pwning | exploitation | ctftime | download | writeup

    Exploitation of a SUBLEQ interpreter, hardened with ASan and UBSan (co-authored with sandr0)
Challenges 2022

  • true_web_assembly | web | ctftime | download | writeup

    0day web challenge targeting the asmbb platform.

  • shadertoy_plus_plus | exploitation | ctftime | download | writeup

    0day exploitation challenge for exploiting Google's ANGLE and SwiftShader GFX libraries.

  • hypersecure | exploitation | ctftime | download | writeup

    Hypervisor-escape challenge for a custom AMD SVM-based hypervisor.

  • browser_insanity | exploitation | ctftime | download | writeup

    0day browser exploitation challenge for the browser used in KolibriOS.
Challenges 2021
Challenges 2020
Challenges 2019

  • tetres2019 | reverse engineering | ctftime | download | writeup

    A tetris game written in a GLSL compute shader. Beat it to get the flag.