Create README.md

squ1rrel-ctf-2024/json-store/README.md

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+# json store
+
+## problem
+
+![image](https://github.com/quasar098/ctf-writeups/assets/70716985/05620503-4f86-4615-bae5-f54a9c8d8397)
+
+see [./json-store.zip](./json-store.zip)
+
+## solution
+
+![image](https://github.com/quasar098/ctf-writeups/assets/70716985/29572fc3-d8d1-4921-8a91-8dcd8198547b)
+
+we are presented with this web app
+
+```js
+const express = require("express");
+const path = require("path");
+const TAFFY = require("taffydb").taffy;
+
+... etc
+```
+
+so this uses taffy in js.
+
+package.json below
+
+```json
+{
+  "name": "kv-store",
+  "version": "1.0.0",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "author": "",
+  "license": "AGPL-3.0",
+  "description": "",
+  "dependencies": {
+    "body-parser": "^1.20.2",
+    "express": "^4.19.2",
+    "taffydb": "^2.7.3"
+  }
+}
+
+```
+
+notably, we can see from the package.json that this is a taffy version that has vulnerabilities. see [here](https://security.snyk.io/vuln/SNYK-JS-TAFFY-546521)
+
+we can literally just put in the proof of concept, change the name to admin, and win
+
+![image](https://github.com/quasar098/ctf-writeups/assets/70716985/03ed56cd-5eb5-4099-b9c9-c9e2c09f6f97)
+