rhsa-2019:1352
Vulnerability from csaf_redhat
Published
2019-06-04 19:10
Modified
2024-11-22 13:16
Summary
Red Hat Security Advisory: etcd security, bug fix, and enhancement update

Notes

Topic
An update for etcd is now available for Red Hat Enterprise Linux 7 Extras. Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details
The etcd packages provide a highly available key-value store for shared configuration. The following packages have been upgraded to a later upstream version: etcd (3.2.26). (BZ#1676902) Security Fix(es): * etcd: Improper Authentication in auth/store.go:AuthInfoFromTLS() via gRPC-gateway (CVE-2018-16886) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use
This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.


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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Matt Wheeler"
          ],
          "organization": "Osirium"
        }
      ],
      "cve": "CVE-2018-16886",
      "cwe": {
        "id": "CWE-287",
        "name": "Improper Authentication"
      },
      "discovery_date": "2018-11-16T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "1651034"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "Etcd, versions 3.2.0 through 3.2.25 and 3.3.0 through 3.3.10, 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\u0027s 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.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "etcd: Improper Authentication in auth/store.go:AuthInfoFromTLS() via gRPC-gateway",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "OpenShift Container Platform 3.x, and 4.1 versions do not use etcd Role-based access control so they are not affected.",
          "title": "Statement"
        },
        {
          "category": "general",
          "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
          "title": "CVSS score applicability"
        }
      ],
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          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2018-16886"
        },
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          "summary": "RHBZ#1651034",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1651034"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2018-16886",
          "url": "https://www.cve.org/CVERecord?id=CVE-2018-16886"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2018-16886",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-16886"
        }
      ],
      "release_date": "2019-01-11T22:05:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2019-06-04T19:10:33+00:00",
          "details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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          "restart_required": {
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          "url": "https://access.redhat.com/errata/RHSA-2019:1352"
        },
        {
          "category": "workaround",
          "details": "Ensure that the client server TLS certificate (specified in --cert-file argument or ETCD_CERT_FILE environment variable) does not include a CN (Common Name) field. If a Common Name field is part of this certificate, replace it with one which omits it.\n\nTo check the CN field of a certificate:\n  openssl x509 -noout -subject -in /path/to/client.crt | grep -o \u0027CN.*\u0027\n\nTo check if there is a username matching the CN field in the TLS client certificate:\n  etcdctl user get \u003cTLS client certificate CN\u003e\n\nFor more information on TLS authentication features including how client-cert-auth is enabled, refer to the etcd transport security model documentation: https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/security.md\nFor more information on Role-based access control including how it is enabled, refer to the etcd role-based access control documentation: https://github.com/etcd-io/etcd/blob/master/Documentation/op-guide/authentication.md",
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      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.8,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.0"
          },
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      "threats": [
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          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "etcd: Improper Authentication in auth/store.go:AuthInfoFromTLS() via gRPC-gateway"
    }
  ]
}


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Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
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  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.