rhsa-2021_5219
Vulnerability from csaf_redhat
Published
2021-12-20 16:20
Modified
2024-11-06 00:16
Summary
Red Hat Security Advisory: Red Hat Single Sign-On security update on RHEL 8

Notes

Topic
A security update is now available for Red Hat Single Sign-On 7.5 on Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. 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
Red Hat Single Sign-On 7.5 is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications. This is an asynchronous patch for Red Hat Single Sign-On 7.5, and includes one security fix. Security Fix: * keycloak: Incorrect authorization allows unpriviledged users to create other users (CVE-2021-4133) For more details about the security issue(s), including the impact, a CVSS score, 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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    "notes": [
      {
        "category": "summary",
        "text": "A security update is now available for Red Hat Single Sign-On 7.5 on Red Hat Enterprise Linux 8.\n\nRed Hat Product Security has rated this update as having a security impact of Important. 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.",
        "title": "Topic"
      },
      {
        "category": "general",
        "text": "Red Hat Single Sign-On 7.5 is a standalone server, based on the Keycloak project, that provides authentication and standards-based single sign-on capabilities for web and mobile applications.\n\nThis is an asynchronous patch for Red Hat Single Sign-On 7.5, and includes one security fix.\n\nSecurity Fix:\n\n* keycloak: Incorrect authorization allows unpriviledged users to create other users (CVE-2021-4133)\n\nFor more details about the security issue(s), including the impact, a CVSS score, and other related information, refer to the CVE page(s) listed in the References section.",
        "title": "Details"
      },
      {
        "category": "legal_disclaimer",
        "text": "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.",
        "title": "Terms of Use"
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    "publisher": {
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      "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.",
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        "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_5219.json"
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    ],
    "title": "Red Hat Security Advisory: Red Hat Single Sign-On security update on RHEL 8",
    "tracking": {
      "current_release_date": "2024-11-06T00:16:45+00:00",
      "generator": {
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      "id": "RHSA-2021:5219",
      "initial_release_date": "2021-12-20T16:20:57+00:00",
      "revision_history": [
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          "summary": "Last updated version"
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  "product_tree": {
    "branches": [
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            "branches": [
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                "name": "Red Hat Single Sign-On 7.5 for RHEL 8",
                "product": {
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                  "product_id": "8Base-RHSSO-7.5",
                  "product_identification_helper": {
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            ],
            "category": "product_family",
            "name": "Red Hat Single Sign-On"
          },
          {
            "branches": [
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        "full_product_name": {
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          "product_id": "8Base-RHSSO-7.5:rh-sso7-keycloak-0:15.0.2-3.redhat_00002.1.el8sso.noarch"
        },
        "product_reference": "rh-sso7-keycloak-0:15.0.2-3.redhat_00002.1.el8sso.noarch",
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      {
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        "full_product_name": {
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  "vulnerabilities": [
    {
      "acknowledgments": [
        {
          "names": [
            "Grzegorz Soba\u0144ski"
          ],
          "organization": "MLabs"
        }
      ],
      "cve": "CVE-2021-4133",
      "cwe": {
        "id": "CWE-863",
        "name": "Incorrect Authorization"
      },
      "discovery_date": "2021-12-17T00:00:00+00:00",
      "ids": [
        {
          "system_name": "Red Hat Bugzilla ID",
          "text": "2033602"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "A flaw was found in Keycloak version from 12.0.0 and before 15.1.1 which allows an attacker with any existing user account to create new default user accounts via the administrative REST API even when new user registration is disabled.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "Keycloak: Incorrect authorization allows unpriviledged users to create other users",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "This flaw affects only Red Hat Single Sign-on 7.5.0. Red Hat Single Sign-on 7.4.x releases are NOT affected. Fix is available for download from customer portal which can be applied on RH-SSO 7.5.0",
          "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": {
        "fixed": [
          "8Base-RHSSO-7.5:rh-sso7-keycloak-0:15.0.2-3.redhat_00002.1.el8sso.noarch",
          "8Base-RHSSO-7.5:rh-sso7-keycloak-0:15.0.2-3.redhat_00002.1.el8sso.src",
          "8Base-RHSSO-7.5:rh-sso7-keycloak-server-0:15.0.2-3.redhat_00002.1.el8sso.noarch"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "Canonical URL",
          "url": "https://access.redhat.com/security/cve/CVE-2021-4133"
        },
        {
          "category": "external",
          "summary": "RHBZ#2033602",
          "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2033602"
        },
        {
          "category": "external",
          "summary": "https://www.cve.org/CVERecord?id=CVE-2021-4133",
          "url": "https://www.cve.org/CVERecord?id=CVE-2021-4133"
        },
        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2021-4133",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-4133"
        },
        {
          "category": "external",
          "summary": "https://github.com/keycloak/keycloak/issues/9247",
          "url": "https://github.com/keycloak/keycloak/issues/9247"
        },
        {
          "category": "external",
          "summary": "https://github.com/keycloak/keycloak/security/advisories/GHSA-83x4-9cwr-5487",
          "url": "https://github.com/keycloak/keycloak/security/advisories/GHSA-83x4-9cwr-5487"
        }
      ],
      "release_date": "2021-12-16T17:05:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2021-12-20T16:20:57+00:00",
          "details": "Before applying this update, make sure all previously released errata relevant to your system have been applied.\n\nFor details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258",
          "product_ids": [
            "8Base-RHSSO-7.5:rh-sso7-keycloak-0:15.0.2-3.redhat_00002.1.el8sso.noarch",
            "8Base-RHSSO-7.5:rh-sso7-keycloak-0:15.0.2-3.redhat_00002.1.el8sso.src",
            "8Base-RHSSO-7.5:rh-sso7-keycloak-server-0:15.0.2-3.redhat_00002.1.el8sso.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2021:5219"
        },
        {
          "category": "workaround",
          "details": "Access to the user-creation functionality in the REST endpoint can be deactivated using CLI commands in undertow.\nrun:\n\nbin/jboss-cli.sh --connect\n/subsystem=undertow/configuration=filter/expression-filter=keycloakPathOverrideUsersCreateEndpoint:add( \\\n  expression=\"(regex(\u0027^/auth/admin/realms/(.*)/users$\u0027) and method(POST))-\u003e response-code(400)\" \\\n)\n/subsystem=undertow/server=default-server/host=default-host/filter-ref=keycloakPathOverrideUsersCreateEndpoint:add()",
          "product_ids": [
            "8Base-RHSSO-7.5:rh-sso7-keycloak-0:15.0.2-3.redhat_00002.1.el8sso.noarch",
            "8Base-RHSSO-7.5:rh-sso7-keycloak-0:15.0.2-3.redhat_00002.1.el8sso.src",
            "8Base-RHSSO-7.5:rh-sso7-keycloak-server-0:15.0.2-3.redhat_00002.1.el8sso.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "LOW",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "8Base-RHSSO-7.5:rh-sso7-keycloak-0:15.0.2-3.redhat_00002.1.el8sso.noarch",
            "8Base-RHSSO-7.5:rh-sso7-keycloak-0:15.0.2-3.redhat_00002.1.el8sso.src",
            "8Base-RHSSO-7.5:rh-sso7-keycloak-server-0:15.0.2-3.redhat_00002.1.el8sso.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "Keycloak: Incorrect authorization allows unpriviledged users to create other users"
    }
  ]
}


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  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
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