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Daniel Wang danielwangksu

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@hackermondev
hackermondev / zendesk.md
Last active June 25, 2025 20:26
1 bug, $50,000+ in bounties, how Zendesk intentionally left a backdoor in hundreds of Fortune 500 companies

hi, i'm daniel. i'm a 15-year-old with some programming experience and i do a little bug hunting in my free time. here's the insane story of how I found a single bug that affected over half of all Fortune 500 companies:

say hello to zendesk

If you've spent some time online, you’ve probably come across Zendesk.

Zendesk is a customer service tool used by some of the world’s top companies. It’s easy to set up: you link it to your company’s support email (like [email protected]), and Zendesk starts managing incoming emails and creating tickets. You can handle these tickets yourself or have a support team do it for you. Zendesk is a billion-dollar company, trusted by big names like Cloudflare.

Personally, I’ve always found it surprising that these massive companies, worth billions, rely on third-party tools like Zendesk instead of building their own in-house ticketing systems.

your weakest link

@kconner
kconner / macOS Internals.md
Last active July 2, 2025 14:28
macOS Internals

macOS Internals

Understand your Mac and iPhone more deeply by tracing the evolution of Mac OS X from prelease to Swift. John Siracusa delivers the details.

Starting Points

How to use this gist

You've got two main options:

@tykurtz
tykurtz / grokking_to_leetcode.md
Last active July 8, 2025 10:28
Grokking the coding interview equivalent leetcode problems

GROKKING NOTES

I liked the way Grokking the coding interview organized problems into learnable patterns. However, the course is expensive and the majority of the time the problems are copy-pasted from leetcode. As the explanations on leetcode are usually just as good, the course really boils down to being a glorified curated list of leetcode problems.

So below I made a list of leetcode problems that are as close to grokking problems as possible.

Pattern: Sliding Window

@Hakky54
Hakky54 / openssl_commands.md
Last active June 9, 2025 12:54 — forked from p3t3r67x0/openssl_commands.md
OpenSSL Cheat Sheet

OpenSSL Cheat Sheet 🔐

Install

Install the OpenSSL on Debian based systems

sudo apt-get install openssl
@dnoliver
dnoliver / enrollment.sh
Last active July 3, 2023 12:31
TPM 2.0 Device Identity Attestation Samples
#!/bin/bash
# Dependencies
# tpm2-tools-4.0.1-1.fc31.x86_64
# tpm2-tss-2.3.1-1.fc31.x86_64
# tpm2-tss-engine-master
set -euxo pipefail
export TPM2TOOLS_TCTI="device:/dev/tpmrm0"
@JoeyBurzynski
JoeyBurzynski / sysctl.conf
Created December 11, 2019 07:13
sysctl.conf Optimization / Ubuntu 18.04
# Kernel sysctl configuration file for Linux
#
# Version 1.14 - 2019-04-05
# Michiel Klaver - IT Professional
# http://klaver.it/linux/ for the latest version - http://klaver.it/bsd/ for a BSD variant
#
# This file should be saved as /etc/sysctl.conf and can be activated using the command:
# sysctl -e -p /etc/sysctl.conf
#
# For binary values, 0 is disabled, 1 is enabled. See sysctl(8) and sysctl.conf(5) for more details.
#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <unistd.h>
#include "config.h"
#include "test.h"
#if HAVE_OPENSSL_SHA_H
@mjbnz
mjbnz / nginx-rproxy-with-sso.md
Last active April 18, 2025 01:15
Nginx Reverse Proxy with simple SSO

Nginx Reverse Proxy for homelab services using SSO

NOTE: This document has now been added to the nginx-sso wiki, here. Any further updates will be made there.

Using:

Usage

export MACOS_UNIVERSAL=no
pip install capstone # or something depends on capstone

Fore more detail...

Refer to this issue: capstone-engine/capstone#1235

@nadavrot
nadavrot / Matrix.md
Last active July 4, 2025 09:02
Efficient matrix multiplication

High-Performance Matrix Multiplication

This is a short post that explains how to write a high-performance matrix multiplication program on modern processors. In this tutorial I will use a single core of the Skylake-client CPU with AVX2, but the principles in this post also apply to other processors with different instruction sets (such as AVX512).

Intro

Matrix multiplication is a mathematical operation that defines the product of