---
title: "Null Siryn (@nullsiryn) | Hashnode"
description: "Read it. Don't Overthink it. Read the latest articles by Null Siryn on Hashnode."
url: "https://hashnode.com/@nullsiryn"
---

@nullsiryn

# Null Siryn

@nullsiryn · Uttar Pradesh, India · Joined May 2025

Read it. Don't Overthink it.

### [Bits Krieg CTF: Cider Vault Solution & Linux Heap Exploitation Guide](https://ctfs.hashnode.dev/bits-krieg-ctf-cider-vault-solution-linux-heap-exploitation-guide?utm_source=hashnode&utm_medium=feed)

Learn to exploit the Cider Vault CTF using Use-After-Free, Tcache Poisoning, and FSOP. A class in Linux heap exploitation with full Python code.

11 min read · [ctfs.hashnode.dev](https://ctfs.hashnode.dev/bits-krieg-ctf-cider-vault-solution-linux-heap-exploitation-guide?utm_source=hashnode&utm_medium=feed)

[Feb 22](https://hashnode.com/posts/bits-krieg-ctf-cider-vault-solution-linux-heap-exploitation-guide/699aa2373dc17c486240b88a)

### [Solving LACTF Lazy Bigrams: Phonetic Bigram Substitution Challenge](https://ctfs.hashnode.dev/solving-lactf-lazy-bigrams-phonetic-bigram-substitution-challenge?utm_source=hashnode&utm_medium=feed)

Learn how to solve the LACTF Bigram Substitution challenge. This walkthrough covers phonetic mapping vulnerabilities and a Python script to recover the flag

3 min read · [ctfs.hashnode.dev](https://ctfs.hashnode.dev/solving-lactf-lazy-bigrams-phonetic-bigram-substitution-challenge?utm_source=hashnode&utm_medium=feed)

[Feb 8](https://hashnode.com/posts/solving-lactf-lazy-bigrams-phonetic-bigram-substitution-challenge/6988d63fba2be4f77422bc2b)

### [Solve LACTF Tic-Tac-No Challenge: OOB Write Exploit Guide](https://ctfs.hashnode.dev/solve-lactf-tic-tac-no-challenge-oob-write-exploit-guide?utm_source=hashnode&utm_medium=feed)

Beat the unbeatable Minimax AI in this LA CTF walkthrough. Learn to exploit an Out-of-Bounds write in C memory to manipulate game logic and capture the flag

3 min read · [ctfs.hashnode.dev](https://ctfs.hashnode.dev/solve-lactf-tic-tac-no-challenge-oob-write-exploit-guide?utm_source=hashnode&utm_medium=feed)

[Feb 8](https://hashnode.com/posts/solve-lactf-tic-tac-no-challenge-oob-write-exploit-guide/6988d637a5a39f20c3a57927)

### [Custom Packaging CTF Writeup: Decrypting the Custom KCF Container](https://ctfs.hashnode.dev/custom-packaging-ctf-writeup-decrypting-the-custom-kcf-container?utm_source=hashnode&utm_medium=feed)

Learn how to decrypt the Krampus Syndicate KCF container in this Forensics CTF walkthrough. Master RC4 decryption, SHA256 key derivation, and FAT parsing.

8 min read · [ctfs.hashnode.dev](https://ctfs.hashnode.dev/custom-packaging-ctf-writeup-decrypting-the-custom-kcf-container?utm_source=hashnode&utm_medium=feed)

[Jan 1](https://hashnode.com/posts/custom-packaging-ctf-writeup-decrypting-the-custom-kcf-container/695603dfa5ba95edd5ea35eb)

### [Trust Issues CTF Writeup: AWS IAM Privilege Escalation](https://ctfs.hashnode.dev/trust-issues-ctf-writeup-aws-iam-privilege-escalation?utm_source=hashnode&utm_medium=feed)

Learn to exploit AWS IAM trust misconfigurations in this CTF walkthrough. Step-by-step guide on privilege escalation, sts:AssumeRole, and S3 data exfiltrati

3 min read · [ctfs.hashnode.dev](https://ctfs.hashnode.dev/trust-issues-ctf-writeup-aws-iam-privilege-escalation?utm_source=hashnode&utm_medium=feed)

[Jan 1](https://hashnode.com/posts/trust-issues-ctf-writeup-aws-iam-privilege-escalation/695603b20e3d92df55b441a0)