rhsa-2023_7855
Vulnerability from csaf_redhat
Published
2023-12-14 19:00
Modified
2024-11-06 04:34
Summary
Red Hat Security Advisory: Red Hat Single Sign-On 7.6.6 security update on RHEL 9

Notes

Topic
New Red Hat Single Sign-On 7.6.6 packages are now available for Red Hat Enterprise Linux 9. 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 7.6 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 release of Red Hat Single Sign-On 7.6.6 on RHEL 9 serves as a replacement for Red Hat Single Sign-On 7.6.5, and includes bug fixes and enhancements. Security Fix(es): * keycloak: redirect_uri validation logic that allows for a bypass of otherwise explicitly allowed hosts (CVE-2023-6134) * keycloak: reflected XSS via wildcard in OIDC redirect_uri (CVE-2023-6291) * keycloak: offline session token DoS (CVE-2023-6563) 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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        "text": "New Red Hat Single Sign-On 7.6.6 packages are now available for Red Hat Enterprise Linux 9.\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.",
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        "text": "Red Hat Single Sign-On 7.6 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 release of Red Hat Single Sign-On 7.6.6 on RHEL 9 serves as a replacement for Red Hat Single Sign-On 7.6.5, and includes bug fixes and enhancements.\n\nSecurity Fix(es):\n* keycloak: redirect_uri validation logic that allows for a bypass of otherwise explicitly allowed hosts (CVE-2023-6134)\n* keycloak: reflected XSS via wildcard in OIDC redirect_uri (CVE-2023-6291)\n* keycloak: offline session token DoS (CVE-2023-6563)\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.",
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          "names": [
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        "name": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)"
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          "text": "A flaw was found in Keycloak that prevents certain schemes in redirects, but permits them if a wildcard is appended to the token. This issue could allow an attacker to submit a specially crafted request leading to cross-site scripting (XSS) or further attacks. This flaw is the result of an incomplete fix for CVE-2020-10748.",
          "title": "Vulnerability description"
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            "version": "3.1"
          },
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      ],
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          "details": "Moderate"
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      ],
      "title": "keycloak: reflected XSS via wildcard in OIDC redirect_uri"
    },
    {
      "cve": "CVE-2023-6291",
      "cwe": {
        "id": "CWE-601",
        "name": "URL Redirection to Untrusted Site (\u0027Open Redirect\u0027)"
      },
      "discovery_date": "2023-11-24T00:00:00+00:00",
      "ids": [
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          "text": "2251407"
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          "text": "A flaw was found in the redirect_uri validation logic in Keycloak. This issue may allow a bypass of otherwise explicitly allowed hosts. A successful attack may lead to an access token being stolen, making it possible for the attacker to impersonate other users.",
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        },
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          "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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          "url": "https://access.redhat.com/errata/RHSA-2023:7855"
        },
        {
          "category": "workaround",
          "details": "Mitigation for this issue is either not available or the currently available options don\u0027t meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.",
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      "scores": [
        {
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            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 7.1,
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          "details": "Important"
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    {
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      "cwe": {
        "id": "CWE-770",
        "name": "Allocation of Resources Without Limits or Throttling"
      },
      "discovery_date": "2023-12-06T00:00:00+00:00",
      "ids": [
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          "system_name": "Red Hat Bugzilla ID",
          "text": "2253308"
        }
      ],
      "notes": [
        {
          "category": "description",
          "text": "An unconstrained memory consumption vulnerability was discovered in Keycloak. It can be triggered in environments which have millions of offline tokens (\u003e 500,000 users with each having at least 2 saved sessions). If an attacker creates two or more user sessions and then open the \"consents\" tab of the admin User Interface, the UI attempts to load a huge number of offline client sessions leading to excessive memory and CPU consumption which could potentially crash the entire system.",
          "title": "Vulnerability description"
        },
        {
          "category": "summary",
          "text": "keycloak: offline session token DoS",
          "title": "Vulnerability summary"
        },
        {
          "category": "other",
          "text": "While this vulnerability can enable complete compromise of system availability, it is not possible to be triggered in every environment. The impact is rated as Important due to several preconditions (number of users and how many sessions each user has) which are beyond an attacker\u0027s control.",
          "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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        {
          "category": "external",
          "summary": "https://nvd.nist.gov/vuln/detail/CVE-2023-6563",
          "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-6563"
        },
        {
          "category": "external",
          "summary": "https://github.com/keycloak/keycloak/issues/13340",
          "url": "https://github.com/keycloak/keycloak/issues/13340"
        }
      ],
      "release_date": "2023-12-14T00:00:00+00:00",
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2023-12-14T19:00:48+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": [
            "9Base-RHSSO-7.6:rh-sso7-keycloak-0:18.0.11-2.redhat_00003.1.el9sso.noarch",
            "9Base-RHSSO-7.6:rh-sso7-keycloak-0:18.0.11-2.redhat_00003.1.el9sso.src",
            "9Base-RHSSO-7.6:rh-sso7-keycloak-server-0:18.0.11-2.redhat_00003.1.el9sso.noarch"
          ],
          "restart_required": {
            "category": "none"
          },
          "url": "https://access.redhat.com/errata/RHSA-2023:7855"
        },
        {
          "category": "workaround",
          "details": "There are three main options to prevent exploitation:\n1) If you are using a reverse proxy, block the consents URL.\n2) This option is less effective: remove the consents application tab from the account console theme.\n3) This option has a significant negative impact on end users: entirely disable offline user profiles.",
          "product_ids": [
            "9Base-RHSSO-7.6:rh-sso7-keycloak-0:18.0.11-2.redhat_00003.1.el9sso.noarch",
            "9Base-RHSSO-7.6:rh-sso7-keycloak-0:18.0.11-2.redhat_00003.1.el9sso.src",
            "9Base-RHSSO-7.6:rh-sso7-keycloak-server-0:18.0.11-2.redhat_00003.1.el9sso.noarch"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 7.7,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "CHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H",
            "version": "3.1"
          },
          "products": [
            "9Base-RHSSO-7.6:rh-sso7-keycloak-0:18.0.11-2.redhat_00003.1.el9sso.noarch",
            "9Base-RHSSO-7.6:rh-sso7-keycloak-0:18.0.11-2.redhat_00003.1.el9sso.src",
            "9Base-RHSSO-7.6:rh-sso7-keycloak-server-0:18.0.11-2.redhat_00003.1.el9sso.noarch"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Important"
        }
      ],
      "title": "keycloak: offline session token DoS"
    }
  ]
}


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