CVE-2018-7544

Name	CVE-2018-7544
Description	A cross-protocol scripting issue was discovered in the management interface in OpenVPN through 2.4.5. When this interface is enabled over TCP without a password, and when no other clients are connected to this interface, attackers can execute arbitrary management commands, obtain sensitive information, or cause a denial of service (SIGTERM) by triggering XMLHttpRequest actions in a web browser. This is demonstrated by a multipart/form-data POST to http://localhost:23000 with a "signal SIGTERM" command in a TEXTAREA element. NOTE: The vendor disputes that this is a vulnerability. They state that this is the result of improper configuration of the OpenVPN instance rather than an intrinsic vulnerability, and now more explicitly warn against such configurations in both the management-interface documentation, and with a runtime warning
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
openvpn (PTS)	jessie, jessie (lts)	2.3.4-5+deb8u3	vulnerable
	stretch (security), stretch (lts), stretch	2.4.0-6+deb9u4	vulnerable
	buster	2.4.7-1+deb10u1	vulnerable
	bullseye	2.5.1-3	vulnerable
	bookworm (security), bookworm	2.6.3-1+deb12u2	vulnerable
	trixie	2.6.7-1	vulnerable
	sid	2.6.9-1	vulnerable

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
openvpn	source	(unstable)	(unfixed)	unimportant

Notes

Not a security issue per se, later versions might explicitly warn in
affected problematic configurations in both the documentation and with
a runtime warning.