---
title: "Discussion on \"0CTF 2025 chsys Writeup: FreeBSD Jail Escape using Directory Sabotage\" | Hashnode"
description: "Discussion on \"0CTF 2025 chsys Writeup: FreeBSD Jail Escape using Directory Sabotage\". Detailed walkthrough of the chsys FreeBSD Pwn challenge of 0CTF. Learn to bypass chroot restrictions using directory sabotage and execv fallback exploits."
url: "https://hashnode.com/posts/0ctf-2025-chsys-writeup-freebsd-jail-escape-using-directory-sabotage/694891131262d7c8b9f5a0af"
---

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# [0CTF 2025 chsys Writeup: FreeBSD Jail Escape using Directory Sabotage](https://ctfs.hashnode.dev/0ctf-2025-chsys-writeup-freebsd-jail-escape-using-directory-sabotage?utm_source=hashnode&utm_medium=feed)

Detailed walkthrough of the chsys FreeBSD Pwn challenge of 0CTF. Learn to bypass chroot restrictions using directory sabotage and execv fallback exploits.

Dec 22, 2025 · 5 min read · ctfs.hashnode.dev  
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-   [#0ctf](https://hashnode.com/tag/0ctf)
-   [#freebsd-jail-escape](https://hashnode.com/tag/freebsd-jail-escape)
-   [#ctf](https://hashnode.com/tag/ctf)
-   [#ctf-writeup](https://hashnode.com/tag/ctf-writeup)
-   [#capturetheflag](https://hashnode.com/tag/capturetheflag)
-   [#binary-exploitation](https://hashnode.com/tag/binary-exploitation)
-   [#pwnable](https://hashnode.com/tag/pwnable)
-   [#jail](https://hashnode.com/tag/jail)

## Written by

[Null Siryn](https://hashnode.com/@nullsiryn)

@nullsiryn · Uttar Pradesh, India

  
[View profile](https://hashnode.com/@nullsiryn)

Read it. Don't Overthink it.

Barely Tame CTF Player. Debugging Addict. Worshipper of Wi-Fi Signals. Human? Depends on the Ping.

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