CVE-2023-49081 – aiohttp

Package

Manager: pip
Name: aiohttp
Vulnerable Version: >=0 <3.9.0

Severity

Level: Medium

CVSS v3.1: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N

CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

EPSS: 0.00242 pctl0.4741

Details

aiohttp's ClientSession is vulnerable to CRLF injection via version ### Summary Improper validation make it possible for an attacker to modify the HTTP request (e.g. to insert a new header) or even create a new HTTP request if the attacker controls the HTTP version. ### Details The vulnerability only occurs if the attacker can control the HTTP version of the request (including its type). For example if an unvalidated JSON value is used as a version and the attacker is then able to pass an array as the `version` parameter. Furthermore, the vulnerability only occurs when the `Connection` header is passed to the `headers` parameter. At this point, the library will use the parsed value to create the request. If a list is passed, then it bypasses validation and it is possible to perform CRLF injection. ### PoC The POC below shows an example of providing an unvalidated array as a version: https://gist.github.com/jnovikov/184afb593d9c2114d77f508e0ccd508e ### Impact CRLF injection leading to Request Smuggling. ### Workaround If these specific conditions are met and you are unable to upgrade, then validate the user input to the `version` parameter to ensure it is a `str`. Patch: https://github.com/aio-libs/aiohttp/pull/7835/files

Metadata

Created: 2023-11-27T23:17:42Z
Modified: 2024-09-04T18:56:35Z
Source: https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/11/GHSA-q3qx-c6g2-7pw2/GHSA-q3qx-c6g2-7pw2.json
CWE IDs: ["CWE-20"]
Alternative ID: GHSA-q3qx-c6g2-7pw2
Finding: F184
Auto approve: 1