CVE-2023-6544 (GCVE-0-2023-6544)

Vulnerability from cvelistv5 – Published: 2024-04-25 15:58 – Updated: 2025-11-11 15:57
VLAI
Title
Keycloak: authorization bypass
Summary
A flaw was found in the Keycloak package. This issue occurs due to a permissive regular expression hardcoded for filtering which allows hosts to register a dynamic client. A malicious user with enough information about the environment could jeopardize an environment with this specific Dynamic Client Registration and TrustedDomain configuration previously unauthorized.
Severity
5.4 (Medium)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-04-25 19:19 UTC
CWE
  • CWE-625 - Permissive Regular Expression
Assigner
redhat CNA under the redhat root
CNA scorecard B 82/100 over 1212 records in the last 180 days details
References
URL Tags
https://access.redhat.com/errata/RHSA-2024:1860 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:1861 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:1862 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:1864 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:1866 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:1867 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2024:1868 vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/security/cve/CVE-2023-6544 vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2253116 issue-trackingx_refsource_REDHAT
Impacted products
Vendor Product Version CPE status
Affected: 22.0.0 , < 22.0.10 (semver)
Affected: 23.0.0 , < 24.0.3 (semver)
Red Hat Red Hat build of Keycloak 22 Unaffected: 22.0.10-1 , < * (rpm)
    cpe:/a:redhat:build_keycloak:22::el9
Create a notification for this product.
Red Hat Red Hat build of Keycloak 22 Unaffected: 22-13 , < * (rpm)
    cpe:/a:redhat:build_keycloak:22::el9
Create a notification for this product.
Red Hat Red Hat build of Keycloak 22 Unaffected: 22-16 , < * (rpm)
    cpe:/a:redhat:build_keycloak:22::el9
Create a notification for this product.
Red Hat Red Hat build of Keycloak 22.0.10     cpe:/a:redhat:build_keycloak:22
Create a notification for this product.
Red Hat Red Hat Single Sign-On 7.6 for RHEL 7 Unaffected: 0:18.0.13-1.redhat_00001.1.el7sso , < * (rpm)
    cpe:/a:redhat:red_hat_single_sign_on:7.6::el7
Create a notification for this product.
Red Hat Red Hat Single Sign-On 7.6 for RHEL 8 Unaffected: 0:18.0.13-1.redhat_00001.1.el8sso , < * (rpm)
    cpe:/a:redhat:red_hat_single_sign_on:7.6::el8
Create a notification for this product.
Red Hat Red Hat Single Sign-On 7.6 for RHEL 9 Unaffected: 0:18.0.13-1.redhat_00001.1.el9sso , < * (rpm)
    cpe:/a:redhat:red_hat_single_sign_on:7.6::el9
Create a notification for this product.
Red Hat RHEL-8 based Middleware Containers Unaffected: 7.6-46 , < * (rpm)
    cpe:/a:redhat:rhosemc:1.0::el8
Create a notification for this product.
Red Hat RHSSO 7.6.8     cpe:/a:redhat:red_hat_single_sign_on:7.6
Create a notification for this product.
Date Public
2024-04-16 00:00
Credits
Red Hat would like to thank Bastian Kanbach (Secure Systems DE [bastian.kanbach@securesystems.de]) for reporting this issue.
Show details on NVD website
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              "url": "https://access.redhat.com/errata/RHSA-2024:1866"
            },
            {
              "name": "RHSA-2024:1867",
              "tags": [
                "vendor-advisory",
                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/errata/RHSA-2024:1867"
            },
            {
              "name": "RHSA-2024:1868",
              "tags": [
                "vendor-advisory",
                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/errata/RHSA-2024:1868"
            },
            {
              "tags": [
                "vdb-entry",
                "x_refsource_REDHAT"
              ],
              "url": "https://access.redhat.com/security/cve/CVE-2023-6544"
            },
            {
              "name": "RHBZ#2253116",
              "tags": [
                "issue-tracking",
                "x_refsource_REDHAT"
              ],
              "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2253116"
            }
          ],
          "timeline": [
            {
              "lang": "en",
              "time": "2023-12-06T00:00:00.000Z",
              "value": "Reported to Red Hat."
            },
            {
              "lang": "en",
              "time": "2024-04-16T00:00:00.000Z",
              "value": "Made public."
            }
          ],
          "title": "Keycloak: authorization bypass",
          "workarounds": [
            {
              "lang": "en",
              "value": "No mitigation is currently available for this flaw."
            }
          ],
          "x_redhatCweChain": "CWE-625: Permissive Regular Expression"
        }
      },
      "cveMetadata": {
        "assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
        "assignerShortName": "redhat",
        "cveId": "CVE-2023-6544",
        "datePublished": "2024-04-25T15:58:47.204Z",
        "dateReserved": "2023-12-06T05:42:36.249Z",
        "dateUpdated": "2025-11-11T15:57:26.470Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


Workarounds

CNA · redhat
No mitigation is currently available for this flaw.

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Tags
Taxonomy of the tags.




Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    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.