CVE-2018-16886

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    CVE-2018-16886

    Published: 14 Jan 2019Last Modified: 8 Jul 2026

    Summary:

    Details: 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.

    References: https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/JX7QTIT465BQGRGNCE74RATRQLKT2QE4/, https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UPGYHMSKDPW5GAMI7BEP3XQRVRLLBJKS/, http://www.securityfocus.com/bid/106540, https://access.redhat.com/errata/RHSA-2019:0237, https://access.redhat.com/errata/RHSA-2019:1352, 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://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16886

    Affected packages

    Package

    Name:

    Purl:

    Affected ranges

    Type: GIT

    Events:

    Introduced- e475a4ea710491899fd4427552eda6ee45775320
    Fixed -06cec40911744c0aca5d1afd69b2631b0a4879ba

    Affected versions

    v3.3.10
    v3.3.9
    v3.3.8
    v3.3.7
    v3.3.6
    v3.3.5
    v3.3.4
    v3.3.3
    v3.3.2
    v3.3.1
    v3.3.0

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High