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CVE-2021-21330 — Open redirect vulnerability in aiohttp

Affected: aio-libs aiohttp

aiohttp is an asynchronous HTTP client/server framework for asyncio and Python. In aiohttp before version 3.7.4 there is an open redirect vulnerability. A maliciously crafted link to an aiohttp-based web-server could redirect the browser to a different website. It is caused by a bug in the `aiohttp.web_middlewares.normalize_path_middleware` middleware. This security problem has been fixed in 3.7.4. Upgrade your dependency using pip as follows "pip install aiohttp >= 3.7.4". If upgrading is not an option for you, a workaround can be to avoid using `aiohttp.web_middlewares.normalize_path_middleware` in your applications.

GHSA-v6wp-4m6f-gcjg — `aiohttp` Open Redirect vulnerability (`normalize_path_middleware` middleware)

Affected: PyPI: aiohttp

### Impact

Open redirect vulnerability — a maliciously crafted link to an aiohttp-based web-server could redirect the browser to a different website.

It is caused by a bug in the `aiohttp.web_middlewares.normalize_path_middleware` middleware.

### Patches

This security problem has been fixed in v3.7.4. Upgrade your dependency as follows: [`pip install aiohttp >= 3.7.4`]

### Workarounds

If upgrading is not an option for you, a workaround can be to avoid using `aiohttp.web_middlewares.normalize_path_middleware` in your applications.

### References

* [aiohttp @ PyPI] * [GHSA-v6wp-4m6f-gcjg] * [OWASP page on open redirects]

### For more information

If you have any questions or comments about this advisory: * Open an issue in the [aiohttp repo](https://github.com/aio-libs/aiohttp/issues/new/choose) * Email us at wk+aio-libs-security@sydorenko.org.ua and/or andrew.svetlov+aio-libs-security@gmail.com

Credit: [Jelmer Vernooĳ] and [Beast Glatisant].

[aiohttp @ PyPI]: https://pypi.org/p/aiohttp [`pip install aiohttp >= 3.7.4`]: https://pypi.org/project/aiohttp/3.7.4/ [GHSA-v6wp-4m6f-gcjg]: https://github.com/aio-libs/aiohttp/security/advisories/GHSA-v6wp-4m6f-gcjg [OWASP page on open redirects]: https://cheatsheetseries.owasp.org/cheatsheets/Unvalidated_Redirects_and_Forwards_Cheat_Sheet.html

[Jelmer Vernooĳ]: https://jelmer.uk [Beast Glatisant]: https://github.com/g147

PYSEC-2021-76

Affected: PyPI: aiohttp