Matching the Remote with Docker (glibc pinning)

Sun, 23 Aug 2026 14:30:00 +0100

Matching the Remote with Docker: glibc Pinning for Pwn

Here’s the failure mode that eats hours: your exploit works flawlessly on your machine, then does nothing against the remote. Nine times out of ten the culprit is the C library. libc offsets — the distance from a leaked puts to system, from system to a /bin/sh string, the exact one_gadget constraints — are specific to the exact glibc build on the target. Your local Ubuntu’s libc is almost never byte-identical to the challenge’s.

Pure Notes

Sat, 22 Aug 2026 12:18:50 +0200

Category: PWN

Difficulty: Medium-Hard

Author: Vincent

Challenge Description

My boss said that our current note taking solution isn’t productive and functional. So I made this purely functional note taking app.

We get the full Haskell source (Main.hs), a Dockerfile, and a flag.txt. The program is a classic heap-note menu — new, write, writehex, view, delete, list — but written in Haskell on top of the C FFI allocator.

Glibc on Adamino CTF Writeups

Matching the Remote with Docker (glibc pinning)

Matching the Remote with Docker: glibc Pinning for Pwn

Pure Notes

Challenge Description