CVE-2018-16886

Name	CVE-2018-16886
Description	etcd versions 3.2.x before 3.2.26 and 3.3.x before 3.3.11 are vulnerable to an improper authentication issue when role-based access control (RBAC) is used and client-cert-auth is enabled. If an etcd client server TLS certificate contains a Common Name (CN) which matches a valid RBAC username, a remote attacker may authenticate as that user with any valid (trusted) client certificate in a REST API request to the gRPC-gateway.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	923008

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
etcd (PTS)	bullseye	3.3.25+dfsg-6	fixed
	bookworm	3.4.23-4	fixed
	trixie	3.5.16-4	fixed
	forky, sid	3.5.16-8	fixed

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

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
etcd	source	(unstable)	3.2.26+dfsg-1			923008

Notes

Introduced by: https://github.com/etcd-io/etcd/commit/0191509637546621d6f2e18e074e955ab8ef374d
Upstream issue: https://github.com/etcd-io/etcd/pull/10366
https://github.com/etcd-io/etcd/commit/bf9d0d8291dc71ecbfb2690612954e1a298154b2
https://github.com/etcd-io/etcd/commit/a9a9466fb8ba11ad7bb6a44d7446fbd072d59887
https://github.com/etcd-io/etcd/commit/99704e2a97e8710da942bdc737417fc9c9a2c03f
https://github.com/etcd-io/etcd/commit/83c051b701d33261eef91a719e4421c81b000ba4