FOSS BUFF3R CTF WRITEUP

I organized my second CTF named, FOSS BUFF3R CTF in collaboration with FOSS VJCET. The event was 10 hours online from 19–05–2023 10:00 AM IST to 08:00 PM IST.

The writeup for the challenges are as follows:

Solution:

1. Open request in burpsuite

GET / HTTP/2
Host: web1.buff3r.in
Cache-Control: max-age=0
Sec-Ch-Ua: "Not:A-Brand";v="99", "Chromium";v="112"
Sec-Ch-Ua-Mobile: ?0
Sec-Ch-Ua-Platform: "Linux"
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.5615.50 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Sec-Fetch-Site: none
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8

2. Change the request method from “GET” to “POST”

POST / HTTP/2
Host: web1.buff3r.in
Cache-Control: max-age=0
Sec-Ch-Ua: "Not:A-Brand";v="99", "Chromium";v="112"
Sec-Ch-Ua-Mobile: ?0
Sec-Ch-Ua-Platform: "Linux"
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/112.0.5615.50 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7
Sec-Fetch-Site: none
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8

Flag: BUFF3RCTF{4bf5fcf7–80ad-4421–98c0–687b67662486}

1. Open the link
2. Check the cookie — “flavor = c3RyYXdiZXJyeQ”
3. Decode the base64 string — strawberry
4. Encode the string “Chocolate” to base64 and supply as “flavor” cookie

Flag — BUFF3RCTF{4ec96591-af43–4cf9–83a7–79b46995f24b}

1. Check https://ctf.buff3r.in/robot.txt

NDIgNTUgNDYgNDYgMzMgNTIgNDMgNTQgNDYgN2IgNjMgMzcgMzcgMzEgMzggMzEgMzggMzAgMmQgNjYgMzUgNjMgNjMgMmQgMzQgNjQgNjUgMzAgMmQgNjEgNjQgMzAgNjIgMmQgNjYgNjMgMzggMzcgMzcgMzYgMzkgMzYgMzIgMzEgNjIgMzggN2Q

2. Decode it from base64 , then with hex

Flag- BUFF3RCTF{c7718180-f5cc-4de0-ad0b-fc87769621b8}

1. Buteforce the password of admin user

Password is: password123

Flag — BUFF3RCTF{5c055c38–84eb-4203–8026–68b537107c8d}

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1. The file contains JsFuck
2. Just execute on the console of browser to get the flag

Flag — BUFF3RCTF{ac65da5e-481a-44c3–8497–89df116c9a67}

1. American online sharing and social media platform — Here refer to Youtube!
2. Check for Foss Youtube Channel

Flag is: BUFF3RCTF{77fed601-dc6f-429c-9f59-fb713e554ce3}

1. Here boss name is “bufferCE0" -> there is a user with this username on twitter!

2. You can see a link tweeted by him -> pay.buff3r.in

3. By analysing it’s DNS records, you can see a TXT record with flag value in it.

Flag -> BUFF3RCTF{756ba684–7188–43a6-b6fc-8da4b7751473}

1. Here by searching “Foss VJCET Study note” you can see a github hosted website -> https://fossvjcet.github.io/
2. There you can access the Collaborative study note section

3. Now there is a clue called “CST206” which is a subject code as per KTU syllabus.

4. So move to that page

5. The flag is written in white text, so it is not visible, either check source code, or select the whole page vby clicking ctrl+A

Flag -> BUFF3RCTF{7692d5c6-bdb7–4568–90cf-212c282aea53}

1. It is told “our ctf theme designer” -> refers to the actual theme designer of FOSS CTF.
2. His hyperlink to github profile is on the footer

3. So we need to find his email id and username, which is his login credentials. as no login page is given, it should refers to the CTF platform itself.

username:0xdevsachin

email(password):sachin00011@gmail.com

4. login to platform

Flag is: BUFF3RCTF{1b37d47f-e1eb-4279-bbf3–204a01c1d3ed}

1. Just visit home page of CTF platform(https://ctf.buff3r.in) and view source code

Flag — BUFF3RCTF{140d5c9e-1f5f-42ec-bef9–022621a2a580}

1. By visiting the link, you can see an email on a static page
2. Send an email to that mail id with a phishing link (phishing link is must)
3. You will get the flag in repsonse.
4. Falg — BUFF3RCTF{ae5eff4e-87aa-4949-a102–60e4362c9d2d}

1. Just decode with base32 and you will get the flag

Flag- BUFF3RCTF{1e6ecd46–82ed-409e-8d8b-12c255483663}

1. It is a Kenny code, Just decode it with kenny

Make it in correct flag format — BUFF3RCTF{UUID-STRING}

Flag — BUFF3RCTF{8cb9c3d9-38e7-4e8c-a822-5a827f2ea0dc}

1. A hex value and a secret key in ASCII value is given.
2. Do a XOR with both key and hex value given
3. convert to ascii

Flag — BUFF3RCTF{4aaed8e0-ebe8–45de-9422-f5047117e402}

1. An image is given

2. By taking metadata of image, we can see a password called “fossishere”

3. By using steghide with that password, we can see this image

4. so we will XOR with this binary value with that encoded string given on the challenge description

1. It is a morbit encoding, Just decode it and convert to correct flag format
2. flag format — BUFF3RCTF{UUID-STRING}
3. Flag — BUFF3RCTF{26AFBD43–1D2A-4A06-A721-F93B507A1B1A}

1. Here, you will get a binary file.
2. just check the strings.

Flag — BUFF3RCTF{788fc055–2e70–4276–905f-3f72a05ba682}

That’s it, it was a nice experience in hosting this CTF. But I was not able to make it foolproof, Some of the contestants claimed the hints by registering alternate accounts, But, I pointed out such participants and eliminated as many as possible.

Even though the CTF was very beginner friendly, It was very challenging for the new ones to the field of cybersecurity, and from their feedback, we came to know that, they loved the CTF a lot.

Finally, I would like to thank the Foss VJCET backend team especially Mr.Jebin for the huge support throughout the event.