CVE-2020-35852:Stored Cross-Site Scripting (XSS) vulnerability in Gist Chatbox due to unrestricted file upload functionality.

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Description Preview

CVE-2020-35852 affects the Chatbox feature in Gist, a customer messaging platform. The vulnerability allows attackers to upload SVG or XML files containing malicious JavaScript code through the file upload functionality. Due to insufficient input validation and lack of file type restrictions, the uploaded files with XSS payloads are stored on the server and executed when viewed by users, potentially leading to session hijacking, credential theft, or other client-side attacks.

Overview

This vulnerability exists in Gist's Chatbox software, which allows unrestricted file uploads including SVG and XML files. The application fails to properly validate or sanitize these uploaded files, which can contain embedded JavaScript code. When these malicious files are accessed or displayed within the application, the browser interprets and executes the embedded JavaScript code in the context of the victim's session. This stored XSS vulnerability is particularly dangerous as it persists on the server and affects any user who views the content containing the malicious payload. Attackers can exploit this vulnerability to steal session cookies, capture credentials, redirect users to malicious websites, or perform actions on behalf of the victim.

Remediation

To mitigate this vulnerability, the following measures should be implemented:

  1. Implement strict file type validation to only allow safe file formats
  2. Validate file content rather than relying solely on file extensions
  3. Implement Content Security Policy (CSP) headers to prevent execution of inline scripts
  4. Sanitize all user-uploaded content before storing and displaying it
  5. Consider using a dedicated media/file storage service that automatically sanitizes uploads
  6. Update to the latest version of Gist Chatbox software if a patch is available
  7. Consider implementing a Web Application Firewall (WAF) to help detect and block XSS attempts

References

  1. Product Information: https://getgist.com
  2. Product Documentation: https://getgist.com/chatbot-software/
  3. Vulnerability Details and Exploit Information: https://github.com/riteshgohil/My_CVE/blob/main/CVE-2020-35852.md
  4. OWASP XSS Prevention Cheat Sheet: https://cheatsheetseries.owasp.org/cheatsheets/Cross_Site_Scripting_Prevention_Cheat_Sheet.html
  5. CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'): https://cwe.mitre.org/data/definitions/79.html

Industry ExposureMost to least
This section illustrates the prevalence of a specific Common Vulnerabilities and Exposures (CVE) across various industries based on customer reports. The ranking displays industries from the most to least affected by this particular vulnerability, offering valuable insight into where this CVE has been most frequently observed. This information can help organizations within these sectors prioritize their security efforts, understand their relative risk exposure compared to their peers, and focus remediation strategies where they are most needed. By understanding the industry-specific impact, organizations can make more informed decisions regarding patching, resource allocation, and overall risk management related to this CVE.

  1. Manufacturing
    Manufacturing
  2. Accommodation & Food Services
    Accommodation & Food Services
  3. Administrative, Support, Waste Management & Remediation Services
    Administrative, Support, Waste Management & Remediation Services
  4. Agriculture, Forestry Fishing & Hunting
    Agriculture, Forestry Fishing & Hunting
  5. Arts, Entertainment & Recreation
    Arts, Entertainment & Recreation
  6. Construction
    Construction
  7. Educational Services
    Educational Services
  8. Finance and Insurance
    Finance and Insurance
  9. Health Care & Social Assistance
    Health Care & Social Assistance
  10. Information
    Information
  11. Management of Companies & Enterprises
    Management of Companies & Enterprises
  12. Mining
    Mining
  13. Other Services (except Public Administration)
    Other Services (except Public Administration)
  14. Professional, Scientific, & Technical Services
    Professional, Scientific, & Technical Services
  15. Public Administration
    Public Administration
  16. Real Estate Rental & Leasing
    Real Estate Rental & Leasing
  17. Retail Trade
    Retail Trade
  18. Transportation & Warehousing
    Transportation & Warehousing
  19. Utilities
    Utilities
  20. Wholesale Trade
    Wholesale Trade

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