HTTP Request Smuggling Affecting aiohttp package, versions [,3.8.6)
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Test your applications- Snyk ID SNYK-PYTHON-AIOHTTP-6057353
- published 15 Nov 2023
- disclosed 14 Nov 2023
- credit Ben Kallus
Introduced: 14 Nov 2023
CVE-2023-47627 Open this link in a new tabHow to fix?
Upgrade aiohttp to version 3.8.6 or higher.
Overview
Affected versions of this package are vulnerable to HTTP Request Smuggling via the HTTP parser. An attacker can manipulate the header parsing, leading to potential request smuggling by exploiting the incorrect usage of the int constructor for Content-Length values, improper handling of NUL, CR, and LF in header values, and improper stripping of whitespace before colon in HTTP headers.
Note:
This is only exploitable if AIOHTTP_NO_EXTENSIONS is enabled or not using a prebuilt wheel.
Workaround
This vulnerability can be mitigated by verifying that a Content-Length value consists only of ASCII digits before parsing, rejecting all messages with NUL, CR, or LF in a header value, and rejecting all messages with whitespace before a colon in a header field.