CVE-2025-27910

Remediation/Mitigation Strategy for CVE-2025-27910 - CSRF in tianti v2.3

This document outlines the remediation and mitigation strategy for CVE-2025-27910, a Cross-Site Request Forgery (CSRF) vulnerability discovered in tianti v2.3.

1. Vulnerability Description:

  • CVE ID: CVE-2025-27910
  • Software: tianti
  • Version: v2.3
  • Vulnerability Type: Cross-Site Request Forgery (CSRF)
  • Affected Component: /user/ajax/upd/status

The tianti v2.3 application is vulnerable to CSRF in the /user/ajax/upd/status component. This means an attacker can potentially trick a legitimate user into performing actions they did not intend to perform on the tianti application without their knowledge. This is achieved by crafting malicious GET or POST requests that the user’s browser unknowingly submits while the user is authenticated to the tianti application.

2. Severity Assessment:

  • CVSS v3 Score: 8.0 (High)

    • AV:N (Network): An attacker can exploit this vulnerability over the network.
    • AC:L (Low): The attack requires little or no user interaction.
    • PR:N (None): No privileges are required to exploit this vulnerability.
    • UI:R (Required): User interaction is required (the user must be tricked into clicking a link or visiting a malicious website).
    • S:U (Unchanged): The security scope is unchanged (the vulnerable component is contained within its security authority).
    • C:H (High): Potential for high confidentiality impact (attacker could potentially access sensitive user data).
    • I:H (High): Potential for high integrity impact (attacker could potentially modify user data or application settings).
    • A:H (High): Potential for high availability impact (attacker could potentially disrupt the availability of the application).

  • Severity: High

3. Known Exploits:

Attackers can craft malicious HTML pages or links containing the vulnerable GET/POST requests. If a logged-in user visits such a page or clicks the link, their browser will automatically send the forged request to the tianti application, potentially leading to:

  • Status changes: An attacker could change the status of a user or resource within the tianti application.
  • Account compromise: Depending on the functionality associated with /user/ajax/upd/status, attackers could potentially modify account settings or perform other actions that could lead to account compromise.
  • Data manipulation: An attacker could manipulate data associated with the user account or the application itself.
  • Privilege escalation: In some cases, CSRF vulnerabilities can be chained with other vulnerabilities to escalate privileges.

4. Remediation Strategy:

The primary remediation strategy is to implement proper CSRF protection mechanisms.

  • Upgrade: The most effective solution is to upgrade to a patched version of tianti that addresses this vulnerability. Check the tianti vendor’s website for security updates and release notes. This is the recommended action.

  • Implement CSRF Tokens: If upgrading is not immediately feasible, implement CSRF tokens for all state-changing requests, especially POST requests. This involves:

    • Generating Unique Tokens: The server-side application should generate a unique, unpredictable, and cryptographically secure token for each user session.
    • Embedding Tokens in Forms/Requests: The generated token should be embedded as a hidden field within HTML forms or as a custom header in AJAX requests.
    • Verifying Tokens on the Server: Before processing any state-changing request, the server must verify that the token included in the request matches the token associated with the user’s session. If the tokens don’t match, the request should be rejected.

    Example (Conceptual):

    • When rendering a form, add a hidden input: * In your application logic, before processing the /user/ajax/upd/status request: # Example using Python/Flask from flask import request, session, abort

      @app.route(’/user/ajax/upd/status’, methods=[‘POST’]) def update_status(): csrf_token = request.form.get(‘csrf_token’) if csrf_token != session.get(‘csrf_token’): abort(403) # Forbidden - Invalid CSRF token

      # Process the request if the token is valid
...

  • Synchronizer Token Pattern (STP): Implement the Synchronizer Token Pattern (STP) which is a common and effective CSRF defense.

  • Double Submit Cookie: This technique involves setting a cookie with a random value and including the same value as a request parameter. The server verifies if both values match. While easier to implement, it is often considered less secure than CSRF tokens due to potential weaknesses with cookie handling.

  • SameSite Cookie Attribute: Consider using the SameSite cookie attribute with values Strict or Lax to mitigate CSRF attacks. Strict provides the strongest protection, but may break some legitimate cross-site requests. Lax offers a good balance between security and usability. Note: SameSite cookies are not a complete CSRF defense on their own, but add a layer of protection.

5. Mitigation Strategy (Interim Measures):

If immediate remediation is not possible, consider the following mitigation measures:

  • User Awareness Training: Educate users about the risks of CSRF attacks and how to identify suspicious links or websites. Advise them to be cautious about clicking links from untrusted sources.

  • Web Application Firewall (WAF) Rules: Implement WAF rules to detect and block suspicious requests that may be indicative of a CSRF attack. This requires careful tuning to avoid false positives.

  • Regular Security Audits: Conduct regular security audits and penetration testing to identify and address potential vulnerabilities.

6. Implementation Steps:

  1. Prioritize Patching: Immediately prioritize upgrading to the latest version of tianti containing the fix for CVE-2025-27910.
  2. Develop/Implement CSRF Protection: If upgrading is delayed, develop and implement CSRF protection mechanisms (e.g., CSRF tokens, STP, SameSite cookies).
  3. Testing: Thoroughly test the implemented CSRF protection to ensure it is effective and does not introduce any new issues.
  4. Deployment: Deploy the updated application or the CSRF protection mechanisms to the production environment.
  5. Monitoring: Continuously monitor the application for any signs of CSRF attacks or other security vulnerabilities.

7. Documentation:

  • Document the implemented CSRF protection mechanisms and the reasoning behind the chosen approach.
  • Maintain a record of all security vulnerabilities and remediation efforts.

8. Version Control:

  • Ensure all code changes related to CSRF protection are properly tracked in a version control system.

9. Communication:

  • Communicate the vulnerability and the remediation strategy to all relevant stakeholders, including developers, system administrators, and users.

By implementing these remediation and mitigation strategies, the risk of exploitation of CVE-2025-27910 can be significantly reduced. Remember to prioritize patching to the latest version and test thoroughly.

Assigner

Date

  • Published Date: 2025-03-10 00:00:00
  • Updated Date: 2025-03-12 16:15:24

More Details

CVE-2025-27910