CVE-2017-16570 in KeystoneJS
Summary
by MITRE
KeystoneJS before 4.0.0-beta.7 allows application-wide CSRF bypass by removing the CSRF parameter and value, aka SecureLayer7 issue number SL7_KEYJS_03. In other words, it fails to reject requests that lack an x-csrf-token header.
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Analysis
by VulDB Data Team • 07/29/2025
The vulnerability identified as CVE-2017-16570 affects KeystoneJS versions prior to 4.0.0-beta.7 and represents a critical cross-site request forgery weakness that undermines the application's security posture. This issue stems from the framework's failure to properly validate the presence of CSRF protection mechanisms, specifically the x-csrf-token header that should be required for all authenticated requests. The vulnerability was categorized as a SecureLayer7 issue with the identifier SL7_KEYJS_03, indicating it was recognized by security researchers as a significant risk to web applications built on this platform. The flaw essentially allows attackers to bypass the entire CSRF protection system by simply omitting the required CSRF token parameter from their requests.
The technical root cause of this vulnerability lies in the improper implementation of CSRF token validation within KeystoneJS's request processing pipeline. When the framework processes incoming HTTP requests, it should verify the presence and validity of the x-csrf-token header before accepting any authenticated operations. However, the vulnerable version fails to enforce this validation, creating a scenario where malicious actors can craft requests that appear legitimate to the server but lack the necessary security token. This design flaw maps directly to CWE-352, which specifically addresses Cross-Site Request Forgery vulnerabilities in web applications. The absence of proper token validation means that any authenticated request can be executed without the required CSRF protection, effectively nullifying the security controls that should prevent unauthorized actions from being performed on behalf of authenticated users.
The operational impact of this vulnerability is substantial as it allows attackers to perform unauthorized actions within the application's context without detection. An attacker could potentially leverage this weakness to modify user data, delete records, change permissions, or execute administrative functions that should require proper authentication and CSRF protection. The vulnerability's severity is amplified because it affects the entire application rather than individual endpoints, meaning that any authenticated functionality could be exploited. This bypass of CSRF protection aligns with ATT&CK technique T1078 which describes valid accounts usage for persistence and privilege escalation. The vulnerability essentially provides attackers with a method to perform actions that would normally require a valid CSRF token, effectively granting them unauthorized access to application functionality that should remain protected.
The recommended mitigations for this vulnerability involve upgrading to KeystoneJS version 4.0.0-beta.7 or later, where the CSRF protection mechanism has been properly implemented and validated. Organizations should also ensure that all applications using KeystoneJS are regularly updated to maintain current security patches. Additional defensive measures include implementing proper input validation for all HTTP headers, configuring web application firewalls to monitor for missing CSRF tokens, and conducting regular security assessments to identify similar vulnerabilities in custom code implementations. Security teams should also consider implementing additional monitoring for unusual patterns of authenticated requests that lack CSRF tokens, as this could indicate exploitation attempts. The fix for this vulnerability demonstrates the importance of proper security controls implementation and highlights the critical need for thorough testing of authentication and authorization mechanisms in web frameworks. Organizations should also review their application security practices to ensure that CSRF protection is consistently applied across all authenticated endpoints and that proper validation is performed before processing sensitive operations.