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Security Advisories: GSA_kwCzR0hTQS1mOTZoLXBtZnItNjZ2d84ABARh
Starlette Denial of service (DoS) via multipart/form-data
Summary
Starlette treats multipart/form-data
parts without a filename
as text form fields and buffers those in byte strings with no size limit. This allows an attacker to upload arbitrary large form fields and 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, or the OS terminates the server process with an OOM error. Uploading multiple such requests in parallel may be enough to render a service practically unusable, even if reasonable request size limits are enforced by a reverse proxy in front of Starlette.
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'
Impact
This Denial of service (DoS) vulnerability affects all applications built with Starlette (or FastAPI) accepting form requests.
Permalink: https://github.com/advisories/GHSA-f96h-pmfr-66vwJSON: https://advisories.ecosyste.ms/api/v1/advisories/GSA_kwCzR0hTQS1mOTZoLXBtZnItNjZ2d84ABARh
Source: GitHub Advisory Database
Origin: Unspecified
Severity: High
Classification: General
Published: about 6 hours ago
Updated: about 4 hours ago
Identifiers: GHSA-f96h-pmfr-66vw, CVE-2024-47874
References:
- https://github.com/encode/starlette/security/advisories/GHSA-f96h-pmfr-66vw
- https://github.com/encode/starlette/commit/fd038f3070c302bff17ef7d173dbb0b007617733
- https://nvd.nist.gov/vuln/detail/CVE-2024-47874
- https://github.com/advisories/GHSA-f96h-pmfr-66vw
Blast Radius: 0.0
Affected Packages
pypi:starlette
Dependent packages: 709Dependent repositories: 29,789
Downloads: 51,689,308 last month
Affected Version Ranges: < 0.40.0
Fixed in: 0.40.0
All affected versions: 0.1.0, 0.1.1, 0.1.2, 0.1.3, 0.1.4, 0.1.5, 0.1.6, 0.1.7, 0.1.8, 0.1.9, 0.1.10, 0.1.11, 0.1.12, 0.1.13, 0.1.14, 0.1.15, 0.1.16, 0.1.17, 0.2.0, 0.2.1, 0.2.2, 0.2.3, 0.3.0, 0.3.1, 0.3.2, 0.3.3, 0.3.4, 0.3.5, 0.3.6, 0.3.7, 0.4.0, 0.4.1, 0.4.2, 0.5.0, 0.5.1, 0.5.2, 0.5.3, 0.5.4, 0.5.5, 0.6.0, 0.6.1, 0.6.2, 0.6.3, 0.7.0, 0.7.1, 0.7.2, 0.7.3, 0.7.4, 0.8.0, 0.8.1, 0.8.2, 0.8.3, 0.8.4, 0.8.5, 0.8.6, 0.8.7, 0.8.8, 0.9.0, 0.9.1, 0.9.2, 0.9.3, 0.9.4, 0.9.5, 0.9.6, 0.9.7, 0.9.8, 0.9.9, 0.9.10, 0.9.11, 0.10.0, 0.10.1, 0.10.2, 0.10.3, 0.10.4, 0.10.5, 0.10.6, 0.10.7, 0.11.0, 0.11.1, 0.11.2, 0.11.3, 0.11.4, 0.12.0, 0.12.1, 0.12.2, 0.12.3, 0.12.4, 0.12.5, 0.12.6, 0.12.7, 0.12.8, 0.12.9, 0.12.10, 0.12.11, 0.12.12, 0.12.13, 0.13.0, 0.13.1, 0.13.2, 0.13.3, 0.13.4, 0.13.5, 0.13.6, 0.13.7, 0.13.8, 0.14.0, 0.14.1, 0.14.2, 0.15.0, 0.16.0, 0.17.0, 0.17.1, 0.18.0, 0.19.0, 0.19.1, 0.20.0, 0.20.1, 0.20.2, 0.20.3, 0.20.4, 0.21.0, 0.22.0, 0.23.0, 0.23.1, 0.24.0, 0.25.0, 0.26.0, 0.26.1, 0.27.0, 0.28.0, 0.29.0, 0.30.0, 0.31.0, 0.31.1, 0.32.0, 0.33.0, 0.34.0, 0.35.0, 0.35.1, 0.36.0, 0.36.1, 0.36.2, 0.36.3, 0.37.0, 0.37.1, 0.37.2, 0.38.0, 0.38.1, 0.38.2, 0.38.3, 0.38.4, 0.38.5, 0.38.6, 0.39.0, 0.39.1, 0.39.2
All unaffected versions: