CVE-2019-16786

Name	CVE-2019-16786
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.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-3000-1
Debian Bugs	947306

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
waitress (PTS)	jessie, jessie (lts)	0.8.9-2+deb8u1	vulnerable
	stretch (security), stretch (lts), stretch	1.0.1-1+deb9u1	fixed
	buster (security), buster, buster (lts)	1.2.0~b2-2+deb10u1	fixed
	bullseye (security), bullseye	1.4.4-1.1+deb11u1	fixed
	bookworm	2.1.2-2	fixed
	sid, trixie	3.0.1-1	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
waitress	source	wheezy	(unfixed)	end-of-life
waitress	source	stretch	1.0.1-1+deb9u1		DLA-3000-1
waitress	source	buster	1.2.0~b2-2+deb10u1
waitress	source	(unstable)	1.4.1-1			947306

Notes

[jessie] - waitress <no-dsa> (Minor issue)
https://github.com/Pylons/waitress/security/advisories/GHSA-g2xc-35jw-c63p
https://github.com/Pylons/waitress/commit/f11093a6b3240fc26830b6111e826128af7771c3