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CVE-2018-16886

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Date: January 14, 2019

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.

Language: Go

Severity Score

Related Resources (19)

http://www.securityfocus.com/bid/106540
https://nvd.nist.gov/vuln/detail/CVE-2018-16886
https://access.redhat.com/security/cve/CVE-2018-16886
https://access.redhat.com/errata/RHSA-2019:1352
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UPGYHMSKDPW5GAMI7BEP3XQRVRLLBJKS
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JX7QTIT465BQGRGNCE74RATRQLKT2QE4/
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16886
https://github.com/etcd-io/etcd/commit/bf9d0d8291dc71ecbfb2690612954e1a298154b2
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/JX7QTIT465BQGRGNCE74RATRQLKT2QE4
https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.3.md#security-authentication
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UPGYHMSKDPW5GAMI7BEP3XQRVRLLBJKS/
https://github.com/etcd-io/etcd/commit/0191509637546621d6f2e18e074e955ab8ef374d
https://github.com/etcd-io/etcd/blob/1eee465a43720d713bb69f7b7f5e120135fdb1ac/CHANGELOG-3.2.md#security-authentication
https://security-tracker.debian.org/tracker/CVE-2018-16886
https://github.com/etcd-io/etcd
https://pkg.go.dev/vuln/GO-2021-0077
https://github.com/etcd-io/etcd/pull/10366
https://access.redhat.com/errata/RHSA-2019:0237
https://www.mend.io/vulnerability-database/CVE-2018-16886

Severity Score

Weakness Type (CWE)

Improper Authentication

CWE-287

Improper Authorization

CWE-285

Top Fix

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): HIGH
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): PARTIAL
Additional information:

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