CVE-2019-18277

Name	CVE-2019-18277
Description	A flaw was found in HAProxy before 2.0.6. In legacy mode, messages featuring a transfer-encoding header missing the "chunked" value were not being correctly rejected. The impact was limited but if combined with the "http-reuse always" setting, it could be used to help construct an HTTP request smuggling attack against a vulnerable component employing a lenient parser that would ignore the content-length header as soon as it saw a transfer-encoding one (even if not entirely valid according to the specification).
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-3034-1, ELA-626-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
haproxy (PTS)	jessie, jessie (lts)	1.5.8-3+deb8u4	fixed
	stretch (security)	1.7.5-2+deb9u1	fixed
	stretch (lts), stretch	1.7.5-2+deb9u2	fixed
	buster (security), buster, buster (lts)	1.8.19-1+deb10u5	fixed
	bullseye (security), bullseye	2.2.9-2+deb11u6	fixed
	bookworm (security), bookworm	2.6.12-1+deb12u1	fixed
	sid, trixie	3.0.7-1	fixed

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

Package	Type	Release	Fixed Version	Origin
haproxy	source	jessie	1.5.8-3+deb8u3	ELA-626-1
haproxy	source	stretch	1.7.5-2+deb9u1	DLA-3034-1
haproxy	source	buster	1.8.19-1+deb10u3
haproxy	source	(unstable)	2.0.6-1

Notes

[jessie] - haproxy <no-dsa> (Minor issue)
https://git.haproxy.org/?p=haproxy-2.0.git;a=commit;h=196a7df44d8129d1adc795da020b722614d6a581
https://nathandavison.com/blog/haproxy-http-request-smuggling