CVE-2019-16786: HTTP Request Smuggling: Invalid Transfer-Encoding in Waitress
CVE-2019-16786 · Severity: low · CVSS 3.1 · Published 2019-12-20
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.
Yes. waitress (PyPI): upgrade to 1.3.1, 1.4.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
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