ubuntu-cve-2018-16886
Vulnerability from osv_ubuntu
Published
2019-01-14 19:29
Modified
2025-09-08 16:45
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.

Severity
6.8 (Medium)
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
8.1 (High)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "etcd",
            "binary_version": "3.2.17+dfsg-1ubuntu0.1+esm2"
          },
          {
            "binary_name": "etcd-client",
            "binary_version": "3.2.17+dfsg-1ubuntu0.1+esm2"
          },
          {
            "binary_name": "etcd-server",
            "binary_version": "3.2.17+dfsg-1ubuntu0.1+esm2"
          },
          {
            "binary_name": "golang-etcd-server-dev",
            "binary_version": "3.2.17+dfsg-1ubuntu0.1+esm2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "etcd",
        "purl": "pkg:deb/ubuntu/etcd@3.2.17+dfsg-1ubuntu0.1+esm2?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.1.0-1",
        "3.2.9+dfsg-2",
        "3.2.9+dfsg-3",
        "3.2.17+dfsg-1",
        "3.2.17+dfsg-1ubuntu0.1~esm1",
        "3.2.17+dfsg-1ubuntu0.1",
        "3.2.17+dfsg-1ubuntu0.1+esm1",
        "3.2.17+dfsg-1ubuntu0.1+esm2"
      ]
    }
  ],
  "aliases": [],
  "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.",
  "id": "UBUNTU-CVE-2018-16886",
  "modified": "2025-09-08T16:45:01Z",
  "published": "2019-01-14T19:29:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2018-16886"
    },
    {
      "type": "REPORT",
      "url": "https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-16886"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/etcd-io/etcd/pull/10366"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/etcd-io/etcd/commit/bf9d0d8291dc71ecbfb2690612954e1a298154b2"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/etcd-io/etcd/commit/a9a9466fb8ba11ad7bb6a44d7446fbd072d59887"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/etcd-io/etcd/commit/99704e2a97e8710da942bdc737417fc9c9a2c03f"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/etcd-io/etcd/commit/83c051b701d33261eef91a719e4421c81b000ba4"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/etcd-io/etcd/pull/10386"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2018-16886"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2018-16886"
  ]
}



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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.