RHSA-2019_1352

Vulnerability from csaf_redhat - Published: 2019-06-04 19:10 - Updated: 2024-11-22 13:16
Summary
Red Hat Security Advisory: etcd security, bug fix, and enhancement update
Severity
Moderate
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.
CVE-2018-16886

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's 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.

6.8 (Medium)
CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
CWE-287 - Improper Authentication
Vendor Fix For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 https://access.redhat.com/errata/RHSA-2019:1352
Workaround 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. To check the CN field of a certificate: openssl x509 -noout -subject -in /path/to/client.crt | grep -o 'CN.*' To check if there is a username matching the CN field in the TLS client certificate: etcdctl user get <TLS client certificate CN> For 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 For 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
References
Acknowledgments
Osirium Matt Wheeler
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  "vulnerabilities": [
    {
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            "Matt Wheeler"
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          "organization": "Osirium"
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          "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"
        },
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          "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.",
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          "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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            "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"
          },
          "products": [
            "7Server-EXTRAS-7.6:etcd-0:3.2.26-1.el7.aarch64",
            "7Server-EXTRAS-7.6:etcd-0:3.2.26-1.el7.ppc64le",
            "7Server-EXTRAS-7.6:etcd-0:3.2.26-1.el7.s390x",
            "7Server-EXTRAS-7.6:etcd-0:3.2.26-1.el7.src",
            "7Server-EXTRAS-7.6:etcd-0:3.2.26-1.el7.x86_64",
            "7Server-EXTRAS-7.6:etcd-debuginfo-0:3.2.26-1.el7.aarch64",
            "7Server-EXTRAS-7.6:etcd-debuginfo-0:3.2.26-1.el7.ppc64le",
            "7Server-EXTRAS-7.6:etcd-debuginfo-0:3.2.26-1.el7.s390x",
            "7Server-EXTRAS-7.6:etcd-debuginfo-0:3.2.26-1.el7.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Moderate"
        }
      ],
      "title": "etcd: Improper Authentication in auth/store.go:AuthInfoFromTLS() via gRPC-gateway"
    }
  ]
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

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.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • 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.