KBID 285 - GraphQL Mutations

Running the app
$ sudo docker pull blabla1337/owasp-skf-lab:graphql-mutations
​
```text
$ sudo docker run -ti -p 127.0.0.1:5000:5000 blabla1337/owasp-skf-lab:graphql-mutations
Or alternatively build yourself!
docker build . -t graphql/mutations && docker run -ti -p 5000:5000 graphql/mutations
The docker should be up in no time and we should now be able to browse the application on http://0.0.0.0:5000/
Now that the app is running let's go hacking!
Running the app Python3
First, make sure python3 and pip are installed on your host machine. After installation, we go to the folder of the lab we want to practise "i.e /skf-labs/XSS/, /skf-labs/jwt-secret/ " and run the following commands:
$ pip3 install -r requirements.txt
$ python3 <labname>
Now that the app is running let's go hacking!
Docker Image and write-up thanks to defev!
Reconnaissance
The application implements a very basic mutation to create a new post on the blog. The mutation used is the following
mutation {
  createPost(input: {body: "' -- ", title: "test_title", authorId: 2}) {
    post {
      body
      authorId
      title
    }
  }
}
If we look at the code we have a class CreatePost that will implement our logic to create a post.
class CreatePost(graphene.Mutation):
    """Mutation to create a post."""
    post = graphene.Field(lambda: PostObject, description="Post created by this mutation.")
​
    class Arguments:
​
        input = CreatePostInput(required=True)
​
    def mutate(self, info, input):
​
        post = Post(**input)
        db.session.add(post)
        db.session.commit()
​
        return CreatePost(post=post)
The method mutate will just get the new Post object and insert an instance in the database.
Exploit
What can you exploit? ;)
KBID 285 - GraphQL Introspection
KBID 7006 - JWT Null
Last updated 3 months ago