Vulnerability-Lookup

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

Affected products

Fixed 9 products

Product	Version	Remediation
Unresolved product id: 7Server-EXTRAS-7.6:etcd-0:3.2.26-1.el7.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-EXTRAS-7.6:etcd-0:3.2.26-1.el7.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-EXTRAS-7.6:etcd-0:3.2.26-1.el7.s390x	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-EXTRAS-7.6:etcd-0:3.2.26-1.el7.src	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-EXTRAS-7.6:etcd-0:3.2.26-1.el7.x86_64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-EXTRAS-7.6:etcd-debuginfo-0:3.2.26-1.el7.aarch64	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-EXTRAS-7.6:etcd-debuginfo-0:3.2.26-1.el7.ppc64le	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-EXTRAS-7.6:etcd-debuginfo-0:3.2.26-1.el7.s390x	—	Vendor Fix fix Workaround
Unresolved product id: 7Server-EXTRAS-7.6:etcd-debuginfo-0:3.2.26-1.el7.x86_64	—	Vendor Fix fix Workaround

Threats

Impact Moderate

References

9 references

URL	Category
https://access.redhat.com/errata/RHSA-2019:1352	self
https://access.redhat.com/security/updates/classi…	external
https://bugzilla.redhat.com/show_bug.cgi?id=1651034	external
https://bugzilla.redhat.com/show_bug.cgi?id=1676902	external
https://security.access.redhat.com/data/csaf/v2/a…	self
https://access.redhat.com/security/cve/CVE-2018-16886	self
https://bugzilla.redhat.com/show_bug.cgi?id=1651034	external
https://www.cve.org/CVERecord?id=CVE-2018-16886	external
https://nvd.nist.gov/vuln/detail/CVE-2018-16886	external

Acknowledgments

Osirium Matt Wheeler

JSON

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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Matt Wheeler"
          ],
          "organization": "Osirium"
        }
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      "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"
        }
      ],
      "product_status": {
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          "url": "https://access.redhat.com/security/cve/CVE-2018-16886"
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          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=1651034"
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      ],
      "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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            "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",
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        },
        {
          "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",
          "product_ids": [
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            "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"
          ]
        }
      ],
      "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"
          },
          "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"
    }
  ]
}

CVE-2018-16886 (GCVE-0-2018-16886)

Vulnerability from cvelistv5 – Published: 2019-01-14 19:00 – Updated: 2024-08-05 10:32

Summary

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

CWE

CWE-287

Assigner

redhat redhat root

References

8 references

URL	Tags
https://github.com/etcd-io/etcd/blob/1eee465a4372…	x_refsource_MISC
http://www.securityfocus.com/bid/106540	vdb-entryx_refsource_BID
https://github.com/etcd-io/etcd/blob/1eee465a4372…	x_refsource_MISC
https://access.redhat.com/errata/RHSA-2019:0237	vendor-advisoryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2…	x_refsource_CONFIRM
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisoryx_refsource_FEDORA
https://access.redhat.com/errata/RHSA-2019:1352	vendor-advisoryx_refsource_REDHAT

Impacted products

1 product

Vendor	Product	Version
The etcd Project	etcd:	Affected: versions 3.2.x before 3.2.26 and 3.3.x before 3.3.11

Date Public

2019-01-11 00:00

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.