CVE-2024-23829 aiohttp's HTTP parser (the python one, not llhttp) still overly lenient about separators

2024-01-2922:41:35

CWE-444

GitHub_M

www.cve.org

aiohttp framework

http parser

request smuggling

resource consumption

security vulnerability

version 3.9.2 fix

6.5 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

LOW

Availability Impact

LOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L

7.3 High

AI Score

Confidence

High

0.001 Low

EPSS

Percentile

31.7%

JSON

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. Security-sensitive parts of the Python HTTP parser retained minor differences in allowable character sets, that must trigger error handling to robustly match frame boundaries of proxies in order to protect against injection of additional requests. Additionally, validation could trigger exceptions that were not handled consistently with processing of other malformed input. Being more lenient than internet standards require could, depending on deployment environment, assist in request smuggling. The unhandled exception could cause excessive resource consumption on the application server and/or its logging facilities. This vulnerability exists due to an incomplete fix for CVE-2023-47627. Version 3.9.2 fixes this vulnerability.

CNA Affected

[
  {
    "vendor": "aio-libs",
    "product": "aiohttp",
    "versions": [
      {
        "version": "< 3.9.2",
        "status": "affected"
      }
    ]
  }
]