CVE-2025-3248

Remediation/Mitigation Strategy for CVE-2025-3248

Vulnerability: Code Injection in Langflow /api/v1/validate/code endpoint

Description: Langflow versions prior to 1.3.0 are vulnerable to code injection. An unauthenticated attacker can send crafted HTTP requests to the /api/v1/validate/code endpoint to execute arbitrary code on the server.

Severity: Critical (CVSS v3.1 Score: 9.8)

Known Exploit: Remote, unauthenticated attackers can send crafted HTTP requests to the /api/v1/validate/code endpoint to inject and execute arbitrary code.

Remediation Steps:

  1. Upgrade Langflow: The primary and most effective solution is to upgrade Langflow to version 1.3.0 or later. This version contains a fix for the code injection vulnerability.

  2. Restrict Access (If Upgrade is Not Immediately Possible): As an interim measure, if upgrading is not immediately feasible, consider restricting access to the /api/v1/validate/code endpoint. This could involve:

    • Implementing network-level access controls (e.g., firewall rules) to limit access to the endpoint based on source IP addresses.
    • Implementing authentication and authorization mechanisms for the /api/v1/validate/code endpoint. Require users to authenticate before accessing this functionality.
    • Disabling the /api/v1/validate/code endpoint entirely if it is not a critical function.

  3. Input Validation: If maintaining an older version is absolutely necessary (which is highly discouraged), implement strict input validation on the /api/v1/validate/code endpoint. This validation should:

    • Sanitize all user-supplied input to prevent the injection of malicious code.
    • Use a whitelist approach to define allowed characters and patterns. Reject any input that does not conform to the whitelist.
    • Encode user input properly to prevent interpretation as code.

  4. Web Application Firewall (WAF): Implement a web application firewall (WAF) to detect and block malicious requests targeting the /api/v1/validate/code endpoint. The WAF should be configured with rulesets that specifically address code injection attacks. Regularly update the WAF ruleset.

  5. Monitoring and Logging: Implement robust monitoring and logging to detect suspicious activity targeting the Langflow application. Pay close attention to requests to the /api/v1/validate/code endpoint and unusual server behavior.

Mitigation Steps:

  1. Regular Security Audits: Conduct regular security audits and penetration testing of the Langflow application to identify and address potential vulnerabilities.
  2. Security Awareness Training: Provide security awareness training to developers and administrators to educate them about common web application vulnerabilities and secure coding practices.
  3. Principle of Least Privilege: Apply the principle of least privilege to Langflow users and processes. Grant only the minimum level of access required to perform their tasks.
  4. Incident Response Plan: Develop and maintain an incident response plan to handle potential security incidents related to the Langflow application. This plan should outline the steps to take in the event of a code injection attack.

Verification:

  • After upgrading Langflow, verify that the vulnerability has been resolved by conducting penetration testing or using a vulnerability scanner.
  • After implementing access controls, verify that the /api/v1/validate/code endpoint is only accessible to authorized users.
  • After implementing input validation, verify that malicious code cannot be injected through the /api/v1/validate/code endpoint.

Assigner

Date

  • Published Date: 2025-04-07 15:15:45
  • Updated Date: 2025-04-07 15:15:45

More Details

CVE-2025-3248