Allocation of Resources Without Limits or Throttling Affecting starlette package, versions [,0.40.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
Do your applications use this vulnerable package?
In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.
Test your applicationsSnyk Learn
Learn about Allocation of Resources Without Limits or Throttling vulnerabilities in an interactive lesson.
Start learning- Snyk IDSNYK-PYTHON-STARLETTE-8186175
- published15 Oct 2024
- disclosed15 Oct 2024
- creditMarcel Hellkamp
Introduced: 15 Oct 2024
CVE-2024-47874 (opens in a new tab)How 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'