CVE-2019-18678

Name	CVE-2019-18678
Description	An issue was discovered in Squid 3.x and 4.x through 4.8. It allows attackers to smuggle HTTP requests through frontend software to a Squid instance that splits the HTTP Request pipeline differently. The resulting Response messages corrupt caches (between a client and Squid) with attacker-controlled content at arbitrary URLs. Effects are isolated to software between the attacker client and Squid. There are no effects on Squid itself, nor on any upstream servers. The issue is related to a request header containing whitespace between a header name and a colon.
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-2028-1, DLA-2278-1, DSA-4682-1, ELA-271-1

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
squid (PTS)	buster (security), buster, buster (lts)	4.6-1+deb10u10	fixed
	bullseye (security), bullseye	4.13-10+deb11u3	fixed
	bookworm (security), bookworm	5.7-2+deb12u2	fixed
	sid, trixie	6.12-1	fixed
squid3 (PTS)	jessie, jessie (lts)	3.5.23-5+deb8u7	fixed
	stretch (security)	3.5.23-5+deb9u7	fixed
	stretch (lts), stretch	3.5.23-5+deb9u10	fixed

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

Package	Type	Release	Fixed Version	Origin
squid	source	buster	4.6-1+deb10u2	DSA-4682-1
squid	source	(unstable)	4.9-1
squid3	source	jessie	3.5.23-5+deb8u1	ELA-271-1
squid3	source	stretch	3.5.23-5+deb9u2	DLA-2278-1
squid3	source	(unstable)	(unfixed)

Notes

Squid 4: http://www.squid-cache.org/Versions/v4/changesets/squid-4-671ba97abe929156dc4c717ee52ad22fba0f7443.patch
http://www.squid-cache.org/Advisories/SQUID-2019_10.txt