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MEDIUM

HTTP Request Smuggling: Invalid Transfer-Encoding in Waitress

Published Dec 20, 2019

Description

Waitress through version 1.3.1 would parse the Transfer-Encoding header and only look for a single string value, if that value was not chunked it would fall through and use the Content-Length header instead. According to the HTTP standard Transfer-Encoding should be a comma separated list, with the inner-most encoding first, followed by any further transfer codings, ending with chunked. Requests sent with: "Transfer-Encoding: gzip, chunked" would incorrectly get ignored, and the request would use a Content-Length header instead to determine the body size of the HTTP message. This could allow for Waitress to treat a single request as multiple requests in the case of HTTP pipelining. This issue is fixed in Waitress 1.4.0.

Affected products

Remediation

Red Hat statement

All affected Red Hat products ship but do not use the flawed version of python-waitress. The impact for these products is therefore rated as having a security impact of Low. In Red Hat OpenStack Platform 13, because the flawed code is not used and the fix would require a substantial amount of development, no update will be provided at this time for the RHOSP13 python-waitress package.

Metrics

Weaknesses (1)

CWE-444

References (17)

Change history (0)

No recorded changes yet.

Sources
CVE.org / MITRE
Status PUBLISHED
Assigner GitHub_M
Published Dec 20, 2019
Updated Aug 5, 2024
Reserved Sep 24, 2019
Link CVE-2019-16786
CISA Vulnrichment
Updated n/a
NVD
Status Modified
Modified Jun 17, 2026
Link CVE-2019-16786
Red Hat
Severity Important
Public date Dec 20, 2019
Links CVE-2019-16786 - Bugzilla
GHSA-G2XC-35JW-C63P