CTF-Playground Writeup

This is a guide on each of the problems for CTF-Playground so far, thank you to our CTF-Officer Phillip for making this!

Welcome

• In this challenge, you need to find the answer contained in a text file. Download the file from the link below, find the answer, and submit it below.
• Flag is found in the text file

Meowers

• In this challenge, you'll need to extract a hidden message (flag) from the image provided below.
• Plugged into aperisolve.com and found flag in the zsteg section

Airplane Friend

• My friend is testing my skills again, he's sent me a photo of him on a window seat of a plane. Can you help me find out where he is based on the photo?
• Plugged photo into Google Lens and ended up finding a reddit post about a city and it was right
• https://www.reddit.com/r/montreal/comments/166bbhi/montreal_from_sky_at_night/

TrynFindme

• theres a contest to find out what's the name of that highlighted building,
• Google Lens it and found a reddit thread with a very similar picture
• https://www.reddit.com/r/HelpMeFind/comments/1g2jopw/hi_help_me_look_for_what_airplane_model_this_is/
• From there I found the plane and located the building across the street

TrynFindme(Alt Version)

• Use google lens to find the plane
• Found a website where every type of that plane is
• https://en.wikipedia.org/wiki/Lockheed_A-12
• Went thru all 9 till i found familiar surrounds and found the building across the street

Hackercat

• This is an odd image, is it hiding something?
• Aperisolve in the zsteg section

Convoluted Text Hunt

• A long, convoluted text file hides a valuable flag. Many false flags lie in wait, but only one is real.
• Big text file put into cyberchef and use the From Base64 recipe to find flag

Encrypception

• Theres this really really long message, and it looks weird…
• Used a combination of CyberChef and https://www.dcode.fr/cipher-identifier to find the flag
• Full recipe

RSAHackUTA

• We found these odd numbers scribbled in one of the rooms in the ERB, I found N and E scribbled on sticky notes, can you decode this?
• Use dcode.fr rsa decoder or write a script to decode the rsa or chatgpt

Vulnerable Program

• You’ve been given a vulnerable .exe program. Can you figure out how to exploit it and reveal the hidden flag?
• Program says you have a 32 buffer so I just held down a for longer than 32 times and flag was printed

Where’s Waldo

• In this challenge, you need to analyze the provided evidence file to uncover hidden information.
• You can find the flag if you look around for the red text

Hidden Bit

• Find out what's going on with the attached file.
• Used a website change the image a bit to reveal the hidden flag
• https://stegonline.georgeom.net/

Hex protect

• Uh oh, looks like my friend thought using multiple crypto algorithms meant he'd be safer! Show him it's quality over quantity!
• Used cyberchef and got the recipe from there
• Full Recipe

RSA Office keys

• These three numbers from my office are suspicious. I found N and c scribbled on sticky notes at Bob's desk, and d at Alice's desk. Are my coworkers hiding something from me?
• Use the rsa solver from dcode

Interwebs

• In this challenge, you need to identify and exploit web vulnerabilities. Start by modifying the cookie to gain admin access to the embedded web application below.
• You can inspect element to check what is needed
• Once you make and change the cookie to the right thing the flag will be shown

Airport Criminal

• The police found a leaked photo of the man on the run, but they can't quiet narrow down which airport he is in. Find out where he is.
• Google lens found me a linkedin post that said the location
• https://www.linkedin.com/posts/seanaahrenscpp\_stairs-of-death-at-ohare-why-the-stairs-activity-7177709774459867137-1eut/

You've Been Hacked!

• You can use a variety of linux commands shown in the prompt
• you can use ls to view inside of directories and folders!