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A collection of write-ups and solutions for Sheffield Ethical Hackers Society GroceryTF CTF 2022.

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Sheffield Ethical Hackers Society GroceryTF CTF 2022

Thurs 31st March 12:00 BST - Sat 2nd April 17:00 BST

Guess who's back, back again

Registration

  • Register on GroceryTF using a university email.

Leaderboard

Challenge Writeups

These have been organized in order they appear on the site:

Cryptography

50pts 100pts 150pts 200pts 250pts
64 Raspberries Tapped Into System John's Birthday #3 Vinegar Requirements Secretly Analysed
2 Attempts John's Birthday #2 Tyger Tyger, Burning Bright
Caesar Salad
John's Birthday #1

Reversing

200pts
Chocolate Log

OSINT

150pts
Open Source Intelligence

Web

50pts 110pts 150pts
Robotic Closing Time Cache Me Outside
Hasbrowns

GEOINT

100pts
Geographically Exposed

Forensics

100pts
Private Investigitter Part 1 - Bad Habits
Private Investigitter Part 2 - Unfocused
Private Investigitter Part 3 - Cloudy with a Chance of Secrets
Private Investigitter Part 4 - Not Even Remotely Secure

Miscellaneous

25pts
Easy Peasy
Read the Rules

Steganography

65pts
A Strange Caterpillar Message

Boot2Root

50pts 100pts
Heist Part 1 - Where's our Console Heist Part 2 - Bad Hygiene

Event Info & Code of Conduct

Event Info

After a disaster last year, the SESH Bakery has improved their security practices (slightly) and made an ambitious expansion to a full-blown grocery store - frESH Groceries!

However, they still have some leaks to plug! Their employees have bunked off the mandatory awareness training, and their web developers are still making sloppy mistakes (which will teach frESH not to use UoS Software Hut students for cheap labour...).

Can you help them identify the holes in their infrastructure and various websites to prevent a full-blown cyber attack occurring again?

There's also a side quest: the SESH committee has also made some improvements to their CTF infrastructure after their Raspberry Pi got stolen last year! Can you find your way into their CTF Management Panel again, and even discover some adjacent systems that they'd really rather not be found?

SESH{EasyP34sYLem0nSque3zy}

Rules

  • Don't attack other players
  • Don't attack our infrastructure
    • On the boot to root, don't attack our cloud services once you have the root flag
    • Only attack the endpoints given to you in challenges
    • If you're not sure if something is in scope, DM an admin on Discord
    • Please read the AWS Penetration Testing Policy and familiarise yourself with their prohibited activities - if you have any questions, just ask
  • No asking committee for hints - sorry!
  • If you think a challenge is broken, please report it - but if it's working correctly, still no hints!
  • Try to limit brute force scanning and automation tools so you don't crash the server
  • No sharing flags in between teams
  • Flags are in the format SESH{*}
  • Be nice to each other in the Discord
  • Good luck! Here's a flag for reading the rules: SESH{y0u_r34d_th3_rules}

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A collection of write-ups and solutions for Sheffield Ethical Hackers Society GroceryTF CTF 2022.

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