Vulnerability Details : CVE-2018-16886
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.
Vulnerability category: BypassGain privilege
Exploit prediction scoring system (EPSS) score for CVE-2018-16886
Probability of exploitation activity in the next 30 days: 2.07%
Percentile, the proportion of vulnerabilities that are scored at or less: ~ 88 % EPSS Score History EPSS FAQ
CVSS scores for CVE-2018-16886
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source |
|---|---|---|---|---|---|
|
6.8
|
MEDIUM | AV:N/AC:M/Au:N/C:P/I:P/A:P |
8.6
|
6.4
|
NIST |
|
6.8
|
MEDIUM | CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |
1.6
|
5.2
|
Red Hat, Inc. |
|
8.1
|
HIGH | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
2.2
|
5.9
|
NIST |
CWE ids for CVE-2018-16886
-
When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct.Assigned by:
- nvd@nist.gov (Primary)
- secalert@redhat.com (Secondary)
References for CVE-2018-16886
-
http://www.securityfocus.com/bid/106540
etcd CVE-2018-16886 Authentication Bypass VulnerabilityThird Party Advisory;VDB Entry
-
https://access.redhat.com/errata/RHSA-2019:0237
RHSA-2019:0237 - Security Advisory - Red Hat Customer PortalThird Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JX7QTIT465BQGRGNCE74RATRQLKT2QE4/
[SECURITY] Fedora 29 Update: etcd-3.3.12-4.20190413gitf29b1ad.fc29 - package-announce - Fedora Mailing-ListsThird Party Advisory
-
https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.3.md#security-authentication
etcd/CHANGELOG-3.3.md at 1eee465a43720d713bb69f7b7f5e120135fdb1ac · etcd-io/etcd · GitHubRelease Notes
-
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16886
1651034 – (CVE-2018-16886) CVE-2018-16886 etcd: Improper Authentication in auth/store.go:AuthInfoFromTLS() via gRPC-gatewayIssue Tracking;Patch;Third Party Advisory
-
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UPGYHMSKDPW5GAMI7BEP3XQRVRLLBJKS/
[SECURITY] Fedora 30 Update: etcd-3.3.12-1.20190314gite1ca3b4.fc30 - package-announce - Fedora Mailing-ListsThird Party Advisory
-
https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.2.md#security-authentication
etcd/CHANGELOG-3.2.md at 1eee465a43720d713bb69f7b7f5e120135fdb1ac · etcd-io/etcd · GitHubRelease Notes
-
https://access.redhat.com/errata/RHSA-2019:1352
RHSA-2019:1352 - Security Advisory - Red Hat Customer PortalThird Party Advisory
Products affected by CVE-2018-16886
- cpe:2.3:o:redhat:enterprise_linux_desktop:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_server:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:redhat:enterprise_linux_workstation:7.0:*:*:*:*:*:*:*
- cpe:2.3:o:fedoraproject:fedora:30:*:*:*:*:*:*:*
- cpe:2.3:a:etcd:etcd:*:*:*:*:*:*:*:*
- cpe:2.3:a:etcd:etcd:*:*:*:*:*:*:*:*