WordPress AcyMailing <7.5.0 - Open Redirect

id: CVE-2021-24288

info:
  name: WordPress AcyMailing <7.5.0 - Open Redirect
  author: 0x_Akoko
  severity: medium
  description: WordPress AcyMailing plugin before 7.5.0 contains an open redirect vulnerability due to improper sanitization of the redirect parameter. An attacker turning the request from POST to GET can craft a link containing a potentially malicious landing page and send it to the user.
  impact: |
    An attacker can exploit this vulnerability to redirect users to malicious websites, leading to phishing attacks or the installation of malware.
  remediation: |
    Update the AcyMailing plugin to version 7.5.0 or later to fix the open redirect vulnerability.
  reference:
    - https://wpscan.com/vulnerability/56628862-1687-4862-9ed4-145d8dfbca97
    - https://nvd.nist.gov/vuln/detail/CVE-2021-24288
    - 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-2021-24288
    cwe-id: CWE-601
    epss-score: 0.00137
    epss-percentile: 0.49121
    cpe: cpe:2.3:a:acymailing:acymailing:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 1
    vendor: acymailing
    product: acymailing
    framework: wordpress
  tags: cve,cve2021,wpscan,wordpress,redirect,wp-plugin,acymailing

http:
  - method: GET
    path:
      - "{{BaseURL}}/index.php?page=acymailing_front&ctrl=frontusers&noheader=1&user[email][email protected]&ctrl=frontusers&task=subscribe&option=acymailing&redirect=https://interact.sh&ajax=0&acy_source=widget%202&hiddenlists=1&acyformname=formAcym93841&acysubmode=widget_acym"

    matchers:
      - type: regex
        part: header
        regex:
          - '(?m)^(?:Location\s*?:\s*?)(?:https?://|//)?(?:[a-zA-Z0-9\-_\.@]*)interact\.sh.*$'
# digest: 4b0a004830460221009abf7c72e4673c71efb3164fa015476a4a3eac0974adc0c3c8a43d3f5674c711022100eb04bf1f3ac4b6c03bfb650e38cce35ea6e62b2debd446add9967fe56a7bbdbf:922c64590222798bb761d5b6d8e72950