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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
SUSE Affected 1 release
| Version | Status | Fixed in |
|---|---|---|
| — | Affected | — |
Debian Fixed 5 releases
| Version | Status | Fixed in |
|---|---|---|
| trixie | Fixed | 3.2.26+dfsg-1 |
| sid | Fixed | 3.2.26+dfsg-1 |
| forky | Fixed | 3.2.26+dfsg-1 |
| bullseye | Fixed | 3.2.26+dfsg-1 |
| bookworm | Fixed | 3.2.26+dfsg-1 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| Go | go.etcd.io/etcd/v3 | >=3.2.0,<3.2.26 | 3.2.26 |
| Go | go.etcd.io/etcd/v3 | >=3.3.0,<3.3.11 | 3.3.11 |
| Go | go.etcd.io/etcd | <0.5.0-alpha.5.0.20190108173120-83c051b701d3 | 0.5.0-alpha.5.0.20190108173120-83c051b701d3 |
References
- https://www.suse.com/security/cve/CVE-2018-16886.html
- https://security-tracker.debian.org/tracker/CVE-2018-16886
- https://nvd.nist.gov/vuln/detail/CVE-2018-16886
- https://github.com/etcd-io/etcd/pull/10366
- https://github.com/etcd-io/etcd/commit/0191509637546621d6f2e18e074e955ab8ef374d
- https://github.com/etcd-io/etcd/commit/bf9d0d8291dc71ecbfb2690612954e1a298154b2
- https://access.redhat.com/errata/RHSA-2019:0237
- https://access.redhat.com/errata/RHSA-2019:1352
- https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16886
- https://github.com/etcd-io/etcd
- https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.2.md#security-authentication
- https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.3.md#security-authentication
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JX7QTIT465BQGRGNCE74RATRQLKT2QE4
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UPGYHMSKDPW5GAMI7BEP3XQRVRLLBJKS
- https://pkg.go.dev/vuln/GO-2021-0077
- http://www.securityfocus.com/bid/106540
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.