CVE-2024-30251

aiohttp vulnerable to infinite loop from crafted POST requests. Upgrade advised.

• CVSS 7.5
• CWE-835
• Resource Management
• Remote

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In affected versions an attacker can send a specially crafted POST (multipart/form-data) request. When the aiohttp server processes it, the server will enter an infinite loop and be unable to process any further requests. An attacker can stop the application from serving requests after sending a single request. This issue has been addressed in version 3.9.4. Users are advised to upgrade. Users unable to upgrade may manually apply a patch to their systems. Please see the linked GHSA for instructions.

CVE

CVE-2024-30251

CWE

CWE-835

CVSS base score

7.5

Published

2024-05-02

OWASP

A10 Insufficient Logging & Monitoring

Orthogonal defect classification

Function

Code defect classification

Incorrect Functionality

Category

Resource Management

Subcategory

Resource Exhaustion

Accessibility scope

Remote

Impact

Denial of Service (DoS)

Affected component

aiohttp

Fixed by upgrading

Yes

Solution

Upgrade to aiohttp version 3.9.4 or later.

from aiohttp import web

async def handle(request):
    # VULNERABLE: This code is susceptible to xss
    data = await request.post()
    while True:
        pass

app = web.Application()
app.router.add_post('/', handle)

if __name__ == '__main__':
    web.run_app(app, port=8080)

from aiohttp import web

async def handle(request):
    # SECURE: This version prevents xss
    data = await request.post()
    return web.Response(text="Data received")

app = web.Application()
app.router.add_post('/', handle)

if __name__ == '__main__':
    web.run_app(app, port=8080)

POST / HTTP/1.1
Host: vulnerable-server.com
Content-Type: multipart/form-data; boundary=----WebKitFormBoundary7MA4YWxkTrZu0gW

------WebKitFormBoundary7MA4YWxkTrZu0gW
Content-Disposition: form-data; name="file"; filename="exploit"
Content-Type: application/octet-stream

<large amount of data to trigger the infinite loop>
------WebKitFormBoundary7MA4YWxkTrZu0gW--

@misc{vaitp:cve202430251,
  title        = {{aiohttp vulnerable to infinite loop from crafted POST requests. Upgrade advised.}},
  author       = {Bogaerts, Fr\'ed\'eric and Ivaki, Naghmeh and Fonseca, Jos\'e},
  year         = {2024},
  note         = {VAITP Python Vulnerability Dataset, entry CVE-2024-30251},
  howpublished = {\url{https://netpack.pt/vaitp/vulnerability/CVE-2024-30251/}}
}