Home Blog Category Security Capture The Flag Flagvent Flagvent 2025 Category: Flagvent 2025 Dive into the 2025 Flagvent CTF challenges, part of the annual festive security event.
Posts Showing 24 posts in this category.
Flagvent 2025: Day 25 Flagvent 2025 4 0 Providing CTF feedback unlocks a prize page, where a spinning Christmas tree asset hides the flag in plain sight. Flagvent 2025: Day 24 Flagvent 2025 3 0 Learn how xortool statistically analyses a multi-byte XOR cipher to recover a 24-byte key and reveal the plain text. Flagvent 2025: Day 23 Flagvent 2025 3 0 Find out how to transform MusicXML measures into a 25×25 QR code grid hiding a secret CTF flag. Flagvent 2025: Day 22 Flagvent 2025 1 0 Uncover how DNA encoding works and decode it with a simple base-to-binary mapping, turning 4-letter chunks into ASCII. Flagvent 2025: Hidden 4 Flagvent 2025 2 0 Explore how whitespace-based steganography in an HTML can hide secret messages! Flagvent 2025: Day 21 Flagvent 2025 3 0 Abuse UUIDv7 timestamp ordering to predict cursor pagination, letting you jump to the earliest entries on Santa’s Nice List and recover a shiny flag. Flagvent 2025: Day 20 Flagvent 2025 2 0 SantaOS got intercepted! Decode a VCD signal with UART, crack a Pigpen key, and break AES-256-CBC to unwrap the hidden message. Flagvent 2025: Day 19 Flagvent 2025 4 0 Learn how to hijack BGP with FRRouting (vtysh) and reroute traffic via longest-prefix match to steal a brainrot flag. Flagvent 2025: Day 18 Flagvent 2025 3 0 Explore how a web server can be exploited in two phases: first, a User-Agent SQL injection (MySQL updatexml) to enumerate and dump the database; then an @everyone chat logic trick to reveal the remaining flag fragment. Flagvent 2025: Day 17 Flagvent 2025 2 0 Learn how a Tail-Breach Compression Oracle Attack can leak secrets via Content-Length, using only HEAD requests and gzip-enabled responses. Flagvent 2025: Hidden 3 Flagvent 2025 2 0 Sneaky Elves hide the flag in a Docker image manifest label, discovered by checking the referenced ghcr.io challenge image. Flagvent 2025: Day 14 Flagvent 2025 4 0 Break a custom linear hash and invert HMAC leaks to recover RNG seeds and grab the flag. Flagvent 2025: Day 13 Flagvent 2025 2 0 Learn how to exploit Kubernetes debug output to leak a Vault token, escalate to admin, and mint a k8s JWT with elevated privileges to access cluster-scoped secrets. Flagvent 2025: Hidden 2 Flagvent 2025 2 0 Discover FV25.H2 Santa’s Secret Tree by spotting extra data appended to an image file, then decoding it to reveal the hidden flag. Flagvent 2025: Day 10 Flagvent 2025 4 0 Exploit a D-Link ShareCenter RCE, drop a PHP web shell, then use a cron tar wildcard injection to escalate privileges to the santa user. Flagvent 2025: Day 9 Flagvent 2025 3 0 Optimise Elf survival probabilities to 1 on the Quantum Transformer Operator website. Experiment with operators, craft a valid input, and retrieve the daily CTF flag. Flagvent 2025: Day 7 Flagvent 2025 2 0 Explore how modem audio was decoded into ASCII with minimodem, leading us to a hidden webpage concealing the flag. Flagvent 2025: Hidden 1 Flagvent 2025 2 0 A hidden flag is found in Day 6 Santa's Wishlist by decoding hex in package.json to ASCII to reveal it. Flagvent 2025: Day 6 Flagvent 2025 3 0 Explore how a window.name XSS exploit was used to steal a flag stored in localStorage Flagvent 2025: Day 5 Flagvent 2025 2 0 Learn how APNG frames can hide data in the blue channel's LSB and how each frame can contain a secret ASCII character. Flagvent 2025: Day 4 Flagvent 2025 2 0 Discover how a corrupted MP4 was repaired and analysed to reveal a hidden SSTV audio signal that decodes into an image containing a secret flag. Flagvent 2025: Day 3 Flagvent 2025 2 0 Automating a symlink maze in a Linux CTF challenge using sudo-permitted commands to walk a symlink chain. Flagvent 2025: Day 2 Flagvent 2025 2 0 Learn how to crack a gyat-themed CTF by converting gyat code to Python and reversing XOR logic to recover the original password. Flagvent 2025: Day 1 Flagvent 2025 4 0 Reconstruct QR code puzzle pieces decorating a Christmas tree to uncover the secret flag message. 