Inconsistent Interpretation of HTTP Requests ('HTTP Request Smuggling')
High severity
Unreviewed
Published
Feb 8, 2022
to the GitHub Advisory Database
•
Updated Sep 29, 2023
Description
Published by the National Vulnerability Database
Feb 15, 2021
Published to the GitHub Advisory Database
Feb 8, 2022
Last updated
Sep 29, 2023
The package python/cpython from 0 and before 3.6.13, from 3.7.0 and before 3.7.10, from 3.8.0 and before 3.8.8, from 3.9.0 and before 3.9.2 are vulnerable to Web Cache Poisoning via urllib.parse.parse_qsl and urllib.parse.parse_qs by using a vector called parameter cloaking. When the attacker can separate query parameters using a semicolon (;), they can cause a difference in the interpretation of the request between the proxy (running with default configuration) and the server. This can result in malicious requests being cached as completely safe ones, as the proxy would usually not see the semicolon as a separator, and therefore would not include it in a cache key of an unkeyed parameter.
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