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Moderate severityNVD Advisory· Published Dec 26, 2019· Updated Aug 5, 2024

HTTP Request Smuggling in Waitress: Invalid whitespace characters in headers

CVE-2019-16789

Description

In Waitress through version 1.4.0, if a proxy server is used in front of waitress, an invalid request may be sent by an attacker that bypasses the front-end and is parsed differently by waitress leading to a potential for HTTP request smuggling. Specially crafted requests containing special whitespace characters in the Transfer-Encoding header would get parsed by Waitress as being a chunked request, but a front-end server would use the Content-Length instead as the Transfer-Encoding header is considered invalid due to containing invalid characters. If a front-end server does HTTP pipelining to a backend Waitress server this could lead to HTTP request splitting which may lead to potential cache poisoning or unexpected information disclosure. This issue is fixed in Waitress 1.4.1 through more strict HTTP field validation.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
waitressPyPI
< 1.4.21.4.2

Affected products

309

Patches

Vulnerability mechanics

References

15

News mentions

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