Pega Infinity - Authentication Bypass

criticalseverity

9.8CVSS score

53.8%likelihood of exploitation, next 30 days

99%of all CVEs are less likely

Readycheck to confirm it

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.

Impact

Successful exploitation of this vulnerability can lead to unauthorized access to sensitive information and potential compromise of the Pega Infinity application.

Fix

Apply the necessary security patches or updates provided by Pega Infinity to mitigate the authentication bypass vulnerability (CVE-2021-27651).

How to confirm it

Send: GET {{BaseURL}}/prweb/PRAuth/app/default/
Positive when: compare_versions(version, '< 8.5.2', '>= 8.2.1') AND contains "Pega Infinity" AND status 200

Run it with nuclei: nuclei -id CVE-2021-27651 -u <target>. This check is not marked as verified by its authors.

The full check

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.
  impact: |
    Successful exploitation of this vulnerability can lead to unauthorized access to sensitive information and potential compromise of the Pega Infinity application.
  remediation: |
    Apply the necessary security patches or updates provided by Pega Infinity to mitigate the authentication bypass vulnerability (CVE-2021-27651).
  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
    - https://github.com/nomi-sec/PoC-in-GitHub
    - https://github.com/orangmuda/CVE-2021-27651
  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
    epss-score: 0.53841
    epss-percentile: 0.99008
    cpe: cpe:2.3:a:pega:infinity:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: pega
    product: infinity
  tags: cve2021,cve,pega,auth-bypass,passive,vuln

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

    host-redirects: true
    max-redirects: 2

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

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

      - type: status
        status:
          - 200

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

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

References

Use this check only on systems you are authorised to test. Where the data comes from