CVE-2019-12855

Name	CVE-2019-12855
Description	In words.protocols.jabber.xmlstream in Twisted through 19.2.1, XMPP support did not verify certificates when used with TLS, allowing an attacker to MITM connections.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	ELA-896-1
Debian Bugs	930626

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
twisted (PTS)	jessie, jessie (lts)	14.0.2-3+deb8u6	fixed
	stretch (security)	16.6.0-2+deb9u3	vulnerable
	stretch (lts), stretch	16.6.0-2+deb9u4	fixed
	buster	18.9.0-3+deb10u1	fixed
	buster (security)	18.9.0-3+deb10u2	fixed
	bullseye	20.3.0-7+deb11u1	fixed
	bookworm	22.4.0-4	fixed
	sid, trixie	24.3.0-1	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
twisted	source	wheezy	(unfixed)	end-of-life
twisted	source	jessie	14.0.2-3+deb8u6		ELA-896-1
twisted	source	stretch	16.6.0-2+deb9u4		ELA-896-1
twisted	source	buster	18.9.0-3+deb10u1
twisted	source	(unstable)	18.9.0-7			930626

Notes

[stretch] - twisted <no-dsa> (Minor issue)
[jessie] - twisted <no-dsa> (Minor issue)
https://github.com/twisted/twisted/pull/1147
https://twistedmatrix.com/trac/ticket/9561