https://th3b0ywh0l1v3d.github.io/tags/flask/ Recent content in Flask on Th3B0yWh0L1v3d — Security Writeups Hugo en-us Mon, 08 Jun 2026 00:00:00 +0000 https://th3b0ywh0l1v3d.github.io/thm/plant-photographer/ Mon, 08 Jun 2026 00:00:00 +0000 https://th3b0ywh0l1v3d.github.io/thm/plant-photographer/ SSRF via a pycurl download endpoint chains into file:// LFI, Werkzeug debug PIN cracking, and full RCE on a Dockerised Flask app. https://th3b0ywh0l1v3d.github.io/ctf/dalctf-2026/web/chakravyuh-defense/ Sun, 07 Jun 2026 00:00:00 +0000 https://th3b0ywh0l1v3d.github.io/ctf/dalctf-2026/web/chakravyuh-defense/ A defensive web CTF where you patch the vulnerable source and the grader attacks your build: Secure the Login is fixed with parameterized queries, and Render & Plunder is sealed by binding SSTI input as render context plus adding an object-level authorization check to kill the IDOR. https://th3b0ywh0l1v3d.github.io/ctf/zer0d4yh31st/web/dead-vault/ Sat, 06 Jun 2026 00:00:00 +0000 https://th3b0ywh0l1v3d.github.io/ctf/zer0d4yh31st/web/dead-vault/ A Money Heist–themed Flask app hides a flag split into three fragments behind a server-side URL fetcher, bypassed with a DNS-based SSRF to reach the internal API and a privileged file-read endpoint. https://th3b0ywh0l1v3d.github.io/ctf/dalctf-2026/web/expensey-eats/ Sat, 06 Jun 2026 00:00:00 +0000 https://th3b0ywh0l1v3d.github.io/ctf/dalctf-2026/web/expensey-eats/ An alg:none JWT forgery grants admin, UNION-based SQLi reveals a hidden $99,999 vault dish, and a broken-authorization order flow lets the admin buy it for free — the flag arrives in a one-time Flask flash message. https://th3b0ywh0l1v3d.github.io/ctf/dalctf-2026/web/heart-part-7/ Sat, 06 Jun 2026 00:00:00 +0000 https://th3b0ywh0l1v3d.github.io/ctf/dalctf-2026/web/heart-part-7/ A Kendrick-themed Flask app chains UNION-based SQLi to leak admin creds, an admin panel exposes an internal cipher microservice, and a Heartbleed-style over-read bleeds the AES-256 master key from heap memory to decrypt the flag. https://th3b0ywh0l1v3d.github.io/ctf/zer0d4yh31st/web/la-casa-de-papel/ Sat, 06 Jun 2026 00:00:00 +0000 https://th3b0ywh0l1v3d.github.io/ctf/zer0d4yh31st/web/la-casa-de-papel/ A Flask/Jinja2 app renders user-supplied names directly into a template, enabling SSTI that dumps os.environ to leak the flag stored as an environment variable. https://th3b0ywh0l1v3d.github.io/ctf/gpn-ctf-2026/web/simple-food-notifications/ Sat, 06 Jun 2026 00:00:00 +0000 https://th3b0ywh0l1v3d.github.io/ctf/gpn-ctf-2026/web/simple-food-notifications/ A Flask meal-notification SSRF whose is_global filter is defeated by abusing urllib3’s retry-driven DNS re-resolution — a global IP that hangs on port 80 (8.8.8.8) outlasts dnsmasq’s 2s cache, so the retry re-resolves to 127.0.0.1 and reaches the localhost-only /vip-meal. https://th3b0ywh0l1v3d.github.io/ctf/gpn-ctf-2026/web/fancy-food-notifications/ Fri, 05 Jun 2026 00:00:00 +0000 https://th3b0ywh0l1v3d.github.io/ctf/gpn-ctf-2026/web/fancy-food-notifications/ Chaining a weak RNG seed (258 possible HMAC keys), an SSRF token leak, a urlparse vs urllib3 parser differential, and a URL-userinfo Basic-auth override to forge a VIP JWT and reach /vip-meal as localhost.