Booru.allthefallen.more May 2026

[+] Token extracted: boru_block_survive [+] Flag: flagb0oru_4ll_th3_f4ll3n_m0r3 | Technique | Why it mattered | |-----------|-----------------| | Directory brute‑forcing (ffuf/DirBuster) | Discovered the hidden /more endpoint. | | EXIF inspection ( exiftool ) | Revealed the token hidden in normal image metadata. | | Base64 decoding | Turned the encoded token into a usable string. | | Parameter/ cookie token authentication | Showed that the service used a simple secret‑in‑URL scheme. | | Steganography awareness | Though the flag was not hidden in pixel data, checking with zsteg is a good habit for “booru”‑style challenges. |

# 1️⃣ Grab a random thumbnail to extract the token thumb=$(curl -s "$BASE/" | grep -oP '(?<=src=")/static/img/[^"]+\.jpg' | head -n1) booru.allthefallen.more

# 2️⃣ Download the image and extract the token from EXIF curl -s "$BASE$thumb" -o thumb.jpg token=$(exiftool -UserComment thumb.jpg | awk -F': ' 'print $2') echo "[+] Token extracted: $token" | | Parameter/ cookie token authentication | Showed

curl -s "https://booru.allthefallen.more/more?token=boru_block_survive" The server responded with a 200 OK and an HTML page that listed a single hidden image: booru.allthefallen.more

boru_block_survive That string looked like a plausible token for the hidden endpoint. 3.1 Crafting the request The /more endpoint required the token to be supplied either as a query string ( ?token=… ) or as a cookie. Trying both:

Write‑up by YourName – 2023

zsteg hidden_flag.jpg No hidden data were found; the flag was solely stored in the EXIF comment, confirming the intended solution. #!/usr/bin/env bash set -euo pipefail