WordPress AcyMailing <7.5.0 - Open Redirect

mediumseverity

6.1CVSS score

1.9%likelihood of exploitation, next 30 days

80%of all CVEs are less likely

Readycheck to confirm it

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.

Fix

Update the AcyMailing plugin to version 7.5.0 or later to fix the open redirect vulnerability.

How to confirm it

Send: GET {{BaseURL}}/index.php?page=acymailing_front&ctrl=frontusers&noheader=1&user[email][email protected]&ctrl=frontusers&task=subscribe&option=acymailing&…
Positive when: matches in header /(?m)^(?:Location\s*?:\s*?)(?:https?://|//)?(?:[a-zA-Z0-9\-_\.@]*)interact\.sh.*$/

Run it with nuclei: nuclei -id CVE-2021-24288 -u <target>. This check is not marked as verified by its authors.

The full check

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: 0.01939
    epss-percentile: 0.8028
    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,vuln

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.*$'

References

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