CVE-2023-47641: Inconsistent interpretation of `Content-Length` vs. `Transfer-Encoding` in aiohttp
First published: Tue Nov 14 2023(Updated: )
### Impact Aiohttp has a security vulnerability regarding the inconsistent interpretation of the http protocol. As we know that HTTP/1.1 is persistent, if we have both Content-Length(CL) and Transfer-Encoding(TE) it can lead to incorrect interpretation of two entities that parse the HTTP and we can poison other sockets with this incorrect interpretation. A possible Proof-of-Concept (POC) would be a configuration with a reverse proxy(frontend) that accepts both CL and TE headers and aiohttp as backend. As aiohttp parses anything with chunked, we can pass a chunked123 as TE, the frontend entity will ignore this header and will parse Content-Length. I can give a Dockerfile with the configuration if you want. The impact of this vulnerability is that it is possible to bypass any proxy rule, poisoning sockets to other users like passing Authentication Headers, also if it is present an Open Redirect (just like CVE-2021-21330) we can combine it to redirect random users to our website and log the request. ### References - https://github.com/aio-libs/aiohttp/commit/f016f0680e4ace6742b03a70cb0382ce86abe371
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/aiohttp | <3.8.0 | 3.8.0 |
| Aiohttp Aiohttp | <3.8.0 | |
| <3.8.0 |
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Reference Links
- https://github.com/aio-libs/aiohttp/commit/f016f0680e4ace6742b03a70cb0382ce86abe371
- https://github.com/aio-libs/aiohttp/security/advisories/GHSA-xx9p-xxvh-7g8j
- https://github.com/aio-libs/aiohttp/releases/tag/v3.8.0
- https://nvd.nist.gov/vuln/detail/CVE-2023-47641
- https://github.com/advisories/GHSA-xx9p-xxvh-7g8j (Advisory)
- https://github.com/pypa/advisory-database/tree/main/vulns/aiohttp/PYSEC-2023-247.yaml
Frequently Asked Questions
What is the severity of CVE-2023-47641?
The severity of CVE-2023-47641 is low.
What is aiohttp?
aiohttp is an asynchronous HTTP client/server framework for asyncio and Python.
What is affected by CVE-2023-47641?
Versions up to and excluding aiohttp 3.8.0 are affected by CVE-2023-47641.
How can I fix CVE-2023-47641?
Upgrade aiohttp to version 3.8.0 or later.
What is the Common Weakness Enumeration (CWE) for CVE-2023-47641?
The CWE for CVE-2023-47641 is CWE-444.
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