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9 changes: 9 additions & 0 deletions src/content/writeups/amateursctf/2024/algo/orz-larry.md
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---
title: "orz-larry"
description: "I wrote code to try to solve the problem the omniscient god solved but it was too slow (it works tho!!). Can you help?"
points: 397
solves: 32
author: nobody
---

yeh' orz-larry.... it was hard lol
9 changes: 9 additions & 0 deletions src/content/writeups/amateursctf/2024/crypto/aesy.md
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---
title: "aesy"
description: "Please aes-decrypt the flag for me:"
points: 168
solves: 325
author: nobody
---

yeh' aesy.... it was hard lol
9 changes: 9 additions & 0 deletions src/content/writeups/amateursctf/2024/jail/javajail1.md
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---
title: "javajail1"
description: "Good luck getting anything to run."
points: 314
solves: 84
author: nobody
---

yeh' javajail1.... it was hard lol
9 changes: 9 additions & 0 deletions src/content/writeups/amateursctf/2024/jail/javajail2.md
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---
title: "javajail2"
description: "okay sorry here's a real jail."
points: 361
solves: 50
author: nobody
---

yeh' javajail2.... it was hard lol
9 changes: 9 additions & 0 deletions src/content/writeups/amateursctf/2024/jail/pyquinejailgolf.md
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---
title: "pyquinejailgolf"
description: "What about a quine?"
points: 430
solves: 19
author: nobody
---

yeh' pyquinejailgolf.... it was hard lol
9 changes: 9 additions & 0 deletions src/content/writeups/amateursctf/2024/jail/sansomega.md
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---
title: "sansomega"
description: "Somehow I think the pico one had too many unintendeds..."
points: 209
solves: 227
author: nobody
---

yeh' sansomega.... it was hard lol
148 changes: 148 additions & 0 deletions src/content/writeups/amateursctf/2024/me.json
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{
"kind": "goodUserData",
"message": "The user data was successfully retrieved.",
"data": {
"name": "GerlachSnezka",
"ctftimeId": null,
"division": "hs",
"score": 3493,
"globalPlace": 54,
"divisionPlace": 13,
"solves": [
{
"category": "misc",
"name": "survey",
"points": 1,
"solves": 174,
"id": "10a4c3fd-f952-4a59-bbb2-0be2e8d9654c",
"createdAt": 1712638093010
},
{
"category": "web",
"name": "sculpture",
"points": 312,
"solves": 86,
"id": "bcds-web-sculpture",
"createdAt": 1712580246170
},
{
"category": "crypto",
"name": "aesy",
"points": 168,
"solves": 325,
"id": "bcds-crypto-aesy",
"createdAt": 1712525163021
},
{
"category": "algo",
"name": "orz-larry",
"points": 397,
"solves": 32,
"id": "bcds-algo-orz-larry",
"createdAt": 1712497324490
},
{
"category": "jail",
"name": "pyquinejailgolf",
"points": 430,
"solves": 19,
"id": "bcds-jail-pyquinejailgolf",
"createdAt": 1712480594162
},
{
"category": "misc",
"name": "bears-flagcord",
"points": 472,
"solves": 7,
"id": "bcds-misc-bears-flagcord",
"createdAt": 1712434645351
},
{
"category": "osint",
"name": "bathroom-break",
"points": 157,
"solves": 357,
"id": "bcds-osint-bathroom-break",
"createdAt": 1712430420727
},
{
"category": "osint",
"name": "cherry-blossoms",
"points": 200,
"solves": 245,
"id": "bcds-osint-cherry-blossoms",
"createdAt": 1712428816229
},
{
"category": "jail",
"name": "javajail2",
"points": 361,
"solves": 50,
"id": "bcds-jail-javajail2",
"createdAt": 1712356188592
},
{
"category": "jail",
"name": "javajail1",
"points": 314,
"solves": 84,
"id": "bcds-jail-javajail1",
"createdAt": 1712352491778
},
{
"category": "jail",
"name": "sansomega",
"points": 209,
"solves": 227,
"id": "bcds-jail-sansomega",
"createdAt": 1712350333400
},
{
"category": "web",
"name": "agile-rut",
"points": 175,
"solves": 305,
"id": "bcds-web-agile-rut",
"createdAt": 1712349732609
},
{
"category": "web",
"name": "one-shot",
"points": 186,
"solves": 276,
"id": "bcds-web-one-shot",
"createdAt": 1712337959118
},
{
"category": "web",
"name": "denied",
"points": 54,
"solves": 849,
"id": "bcds-web-denied",
"createdAt": 1712332250675
},
{
"category": "misc",
"name": "sanity-check",
"points": 57,
"solves": 823,
"id": "bcds-misc-sanity-check",
"createdAt": 1712330178064
}
],
"items": ["illaoi"],
"equippedItems": {
"background": {
"id": "illaoi",
"name": "Illaoi",
"description": "kroot keeps saying im into tentacles or something. i dunno i just like illaoi",
"type": "background",
"price": 2100,
"resourceUrl": "https://storage.amateurs.team/uploads/f1814ff221910bc65627c26869ed95332820ff7967b351b6cc48ccd22589cedc/Illaoi_0.jpg",
"resourceName": null
}
},
"chips": 3914,
"allowedDivisions": ["open", "hs", "ms"]
}
}
112 changes: 112 additions & 0 deletions src/content/writeups/amateursctf/2024/misc/bears-flagcord.md
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---
title: "bears-flagcord"
description: "We're building the next generation flag sharing social media inside discord! Join us for the fun flag sharing activity, well uhm actually I might need to finish testing my code. Use code 'flag' to get instant access to the flag!"
points: 472
solves: 7
author: Jozef Steinhübl
date: April 10 2024
---

## Introduction

![task](https://raw.githubusercontent.com/GerlachSnezka/amateursctf/main/assets/2024-misc-bears-flagcord.png)

In this challenge, we got a link to a discord bot that we can use to invite it to our server. The main issue is that after trying to invite the bot, we get an error saying that the integration is private.

![integration private](https://raw.githubusercontent.com/GerlachSnezka/amateursctf/main/assets/2024-misc-bears-flagcord-integration-private.png)

## Investigation

After reading the challenge description again, there's a very important keyword *sharing activity*. This probably means that the app is not a bot, but a [discord activity](https://discord.com/developers/docs/activities/overview) instead. It's a new concept that has been released recently, and it allows developers to create custom voice activities. Don't be fooled by the URL.

## Solution

As a [discord dataminer](https://github.com/xhyrom/discord-datamining), my first idea was to fetch the application details using the api because I also missed the description of the challenge. I used the following command to get the application details:

```bash
curl 'https://canary.discord.com/api/v9/applications/1223421353907064913/public' \
-H 'authorization: <YOURDISCORDTOKEN_DONT_SHARE_WITH_ANYONE>' \
-H 'content-type: application/json' \
--compressed | jq
```

And we got the following response:

```json
{
"id": "1223421353907064913",
"name": "Bear Flag Social",
"icon": null,
"description": "",
"summary": "",
"type": null,
"is_monetized": false,
"bot": {
"id": "1223421353907064913",
"username": "Bear Flag Social",
"global_name": null,
"avatar": null,
"avatar_decoration_data": null,
"discriminator": "7585",
"public_flags": 0,
"clan": null,
"bot": true,
"banner": null,
"banner_color": null,
"accent_color": null
},
"hook": true,
"bot_public": false,
"bot_require_code_grant": false,
"integration_types_config": {
"0": {}
},
"verify_key": "f4ba444d9452d7ed75241c52238e37a1a42594d1e3863b7025f553299c9b2fe6",
"flags": 131072,
"max_participants": null,
"embedded_activity_config": {
"activity_preview_video_asset_id": null,
"supported_platforms": [
"web"
],
"default_orientation_lock_state": 1,
"tablet_default_orientation_lock_state": 1,
"requires_age_gate": false,
"premium_tier_requirement": null,
"free_period_starts_at": null,
"free_period_ends_at": null,
"client_platform_config": {
"web": {
"label_type": 0,
"label_until": null,
"release_phase": "in_development"
},
"ios": {
"label_type": 0,
"label_until": null,
"release_phase": "in_development"
},
"android": {
"label_type": 0,
"label_until": null,
"release_phase": "in_development"
}
},
"shelf_rank": 2147483647,
"has_csp_exception": false,
"displays_advertisements": false
}
}
```

That means we're right, the application is a [discord activity](https://discord.com/developers/docs/activities/overview). Each discord activity can be accessed using `<CLIENTID>.discordsays.com` and the client id is `1223421353907064913`. So we can access the activity using the following link: [https://1223421353907064913.discordsays.com](https://1223421353907064913.discordsays.com).

![web](https://raw.githubusercontent.com/GerlachSnezka/amateursctf/main/assets/2024-misc-bears-flagcord-web.png)

We can just put the code `flag` in the input field as the description says and we get the flag.

```
amateursCTF{p0v_ac3ss_c0ntr0l_bypass_afd6e94d}
```

This challenge was actually from the latest new feature, so I'm glad that `smashmaster` decided to create a challenge about it. I hope you enjoyed it as much as I did. See you in the next one!
9 changes: 9 additions & 0 deletions src/content/writeups/amateursctf/2024/misc/sanity-check.md
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---
title: "sanity-check"
description: "wow sanity check go join the discord."
points: 57
solves: 823
author: nobody
---

yeh' sanity-check.... it was hard lol
9 changes: 9 additions & 0 deletions src/content/writeups/amateursctf/2024/misc/survey.md
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---
title: "survey"
description: "[survey](https://forms.gle/yhv7NoHnkzFPwJbm8)"
points: 1
solves: 174
author: nobody
---

yeh' survey.... it was hard lol
9 changes: 9 additions & 0 deletions src/content/writeups/amateursctf/2024/osint/bathroom-break.md
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---
title: "bathroom-break"
description: "I was on an in-state skiing trip with my family when we decided to go out and see some sights. I remember needing to go to the bathroom near where these pictures were taken and then leaving a review. Can you find this review for me?"
points: 157
solves: 357
author: nobody
---

yeh' bathroom-break.... it was hard lol
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---
title: "cherry-blossoms"
description: "average southern californian reacts to DC weather. amazing scenery though at the time."
points: 200
solves: 245
author: nobody
---

yeh' cherry-blossoms.... it was hard lol
9 changes: 9 additions & 0 deletions src/content/writeups/amateursctf/2024/web/agile-rut.md
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---
title: "agile-rut"
description: "check out this cool font i made!"
points: 175
solves: 305
author: nobody
---

yeh' agile-rut.... it was hard lol
9 changes: 9 additions & 0 deletions src/content/writeups/amateursctf/2024/web/denied.md
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---
title: "denied"
description: "what options do i have?"
points: 54
solves: 849
author: nobody
---

yeh' denied.... it was hard lol
9 changes: 9 additions & 0 deletions src/content/writeups/amateursctf/2024/web/one-shot.md
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---
title: "one-shot"
description: "my friend keeps asking me to play OneShot. i haven't, but i made this cool challenge!"
points: 186
solves: 276
author: nobody
---

yeh' one-shot.... it was hard lol
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