Saihat's Network Security Blog

Introduction Today we're doing a CTF writeup for the Buzz challenge from the NahamCon2021 CTF. Buzz is a file compression challenge and after we started the challenge we downloaded the associated file we checked what kind of file it was: file buzz Seems to be a compressed file, but no specific type is identified. We try decompressing it with Gzip , a common compression program: gzip -d buzz Gzip won't interact with any files that don't have the .gz file extension, so let's add it: mv buzz buzz.gz Now let's try again: gzip -d buzz Seems to have worked. Let's check the buzz file's type again: file buzz It worked. Let's read the file: cat buzz Summary The downloaded file appeared to be compressed upon inspection. Upon renaming the file to add a common file-compression extension, we were able to decompress the file and read it, accessing the objective flag string. Finish