# K17 CTF 2025

Link: [https://ctf.secso.cc/challenges](<https://ctf.secso.cc/challenges>)

CTFTime: [https://ctftime.org/event/2902](<https://ctftime.org/event/2902>)

Official Writeups: [https://github.com/unswsecsoc/2025-k17-ctf](<https://github.com/unswsecsoc/2025-k17-ctf>)

Result: 6319 Points, 5th Place

Solved Challenges:

Meta:

- [sanity check](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/sanity-check.html>)
- [discord](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/discord.html>)

Beginner:

- [radioactive](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/radioactive.html>)
- [smoothie](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/smootie.html>)
- [el camel](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/el-camel.html>)
- [pass me the salt](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/pass-me-the-salt.html>)
- [daily re](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/daily-re.html>)
- [ezwins](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/ezwins.html>)
- [jumping](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/jumping.html>)
- [dinner](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/dinner.html>)
- [vault](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/vault.html>)

Misc:

- [phished](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/phished.html>)
- [tunnel](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/tunnel.html>)

Crypto:

- [layers](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/layers.html>)
- [tricks](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/tricks.html>)
- [worsehelp](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/worsehelp.html>)

Reversing:

- [secure exam browser](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/secure-exam-browser.html>)
- [bait and switch](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/bait-and-switch.html>)
- [qna](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/qna.html>)

Web:

- [janus](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/janus.html>)
- [autofill](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/autofill.html>)
- [pwnable document format](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/pwnable-document-format.html>)

Pwn solved by @Rosayxy:

- [u get me write](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/u-get-me-write.html>)
- [singular hole](<https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/singular-hole.html>)

Thanks for the writeup prize!

```
Our official write-ups are now online hosted in our repository here. Congratulations to jiegec for winning the writeup prize, you can see their writeups here: https://jia.je/ctf-writeups/2025-09-19-k17-ctf-2025/.

We'll see you all again next for our CTF next year!
```