id: CVE-2021-27651

info:
  name: Pega Infinity - Authentication Bypass
  author: idealphase,daffainfo
  severity: critical
  description: Pega Infinity versions 8.2.1 through 8.5.2 contain an authentication bypass vulnerability because the password reset functionality for local accounts can be used to bypass local authentication checks.
  reference:
    - https://github.com/samwcyo/CVE-2021-27651-PoC/blob/main/RCE.md
    - https://nvd.nist.gov/vuln/detail/CVE-2021-27651
    - https://collaborate.pega.com/discussion/pega-security-advisory-a21-hotfix-matrix
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2021-27651
    cwe-id: CWE-287,CWE-640
  tags: cve,cve2021,pega,auth-bypass

requests:
  - method: GET
    path:
      - "{{BaseURL}}/prweb/PRAuth/app/default/"

    cookie-reuse: true
    redirects: true
    max-redirects: 2
    extractors:
      - type: regex
        name: version
        internal: true
        group: 1
        regex:
          - '(?m)<span>Pega ([0-9.]+)</span>'

      - type: regex
        group: 1
        regex:
          - '(?m)<span>Pega ([0-9.]+)</span>'

    matchers-condition: and
    matchers:
      - type: status
        status:
          - 200

      - type: word
        part: body
        words:
          - 'Pega Infinity'

      - type: dsl
        dsl:
          - compare_versions(version, '< 8.5.2', '>= 8.2.1')

# Enhanced by mp on 2022/05/17