terjanq

Postviewer v5² Writeup by @terjanq

Google CTF 2025

Introduction

Postviewer challenges have become a highlight of the Web category of Google CTF, and this year featured yet another continuation of the series—Postviewer v5². There were two versions of the same challenge; the core challenge was for Chrome, and the other was for Firefox, called Postviewer v5² (FF).

This year, I intended the core challenge to be difficult, and this was indeed the case, given that only two teams managed to retrieve the flag: justCatTheFish and Friendly Maltese Citizens.

mistrasteos

ARG GCC_VERSION=11

FROM gcc:${GCC_VERSION} AS builder

ARG REDIS_VERSION=stable

# from https://redis.io/topics/quickstart
RUN wget https://download.redis.io/releases/redis-${REDIS_VERSION}.tar.gz && \
    tar xvzf redis-${REDIS_VERSION}.tar.gz && \
    cd redis-${REDIS_VERSION} && \

JamesHopbourn

玩法文章

• Hum 151010 URL Schemes 使用详解
• Hum 160427 OmniFocus 的 URL Schemes 用法
• Hum 171115 通过 Bear 来认识 Launch Center Pro 的进阶用法
• Hum 171122 通过 Bear 来认识 Drafts 的 [[line]] 用法
• Hum 180518 入门 iOS 自动化：读懂 URL Schemes
• Hum 180823 Universal Link 使用详解
• Hum 181229 x-callback-URL 的使用方法
• JamesHopbourn 210204 Drafts + vim = URL Scheme 复用
• JamesHopbourn 210405 Drafts 5 与 Bear 联手，让我可以快速追加笔记

rkttu

FROM mcr.microsoft.com/windows:1903 AS build

WORKDIR C:\\odtsetup
ADD https://download.microsoft.com/download/2/7/A/27AF1BE6-DD20-4CB4-B154-EBAB8A7D4A7E/officedeploymenttool_11617-33601.exe odtsetup.exe
RUN odtsetup.exe /quiet /norestart /extract:C:\\odtsetup

FROM mcr.microsoft.com/windows:1903 AS download

WORKDIR C:\\odtsetup
COPY --from=build C:\\odtsetup\\setup.exe .

angristan

Elasticsearch settings for single-node cluster

1 shard, 0 replica.

For future indices

Update default template:

curl -X PUT http://localhost:9200/_template/default -H 'Content-Type: application/json' -d '{"index_patterns": ["*"],"order": -1,"settings": {"number_of_shards": "1","number_of_replicas": "0"}}' 

steven2358

FFmpeg cheat sheet

A list of useful commands for the FFmpeg command line tool.

Download FFmpeg: https://www.ffmpeg.org/download.html

Full documentation: https://www.ffmpeg.org/ffmpeg.html

Basic conversion

norswap

package demo;

public interface Node {}

christoph-daehne

import org.springframework.http.HttpMethod
import org.springframework.http.HttpStatus
import org.springframework.stereotype.Component
import org.springframework.web.server.ServerWebExchange
import org.springframework.web.server.WebFilter
import org.springframework.web.server.WebFilterChain
import reactor.core.publisher.Mono

@Component
class CorsFilter : WebFilter {

lukebakken

#!/usr/bin/env bash

set -o errexit
set -o nounset

declare -r passwd="${1:-newpassword}"

declare -r tmp0="$(mktemp)"
declare -r tmp1="$(mktemp)"

felipeochoa

How the DOCX spec works

The standard can be downloaded from the ISO website at [this direct link][iso direct link]

DOCX documents are a zipped folder containing several interacting components in a word doc. The main ones are:

• word/document.xml: The main document content
• word/styles.xml: Name style information (e.g. "Header 1"), similar to CSS