CVE-2024-38513 in fiber
Summary
by MITRE • 07/01/2024
Fiber is an Express-inspired web framework written in Go A vulnerability present in versions prior to 2.52.5 is a session middleware issue in GoFiber versions 2 and above. This vulnerability allows users to supply their own session_id value, resulting in the creation of a session with that key. If a website relies on the mere presence of a session for security purposes, this can lead to significant security risks, including unauthorized access and session fixation attacks. All users utilizing GoFiber's session middleware in the affected versions are impacted. The issue has been addressed in version 2.52.5. Users are strongly encouraged to upgrade to version 2.52.5 or higher to mitigate this vulnerability. Users who are unable to upgrade immediately can apply the following workarounds to reduce the risk: Either implement additional validation to ensure session IDs are not supplied by the user and are securely generated by the server, or regularly rotate session IDs and enforce strict session expiration policies.
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Analysis
by VulDB Data Team • 10/02/2025
The vulnerability identified as CVE-2024-38513 affects GoFiber web framework versions prior to 2525, specifically targeting the session middleware implementation. This flaw represents a critical security weakness in how session identifiers are handled within the framework's authentication system. The issue stems from the session middleware's inability to properly validate session_id values provided by clients, allowing malicious actors to inject their own session identifiers into the system. This creates a fundamental breach in the framework's session management architecture, potentially undermining the entire security model of applications built on GoFiber.
The technical implementation of this vulnerability resides in the session middleware's session_id handling mechanism, which fails to enforce proper server-side generation of session identifiers. When users supply their own session_id values, the system accepts these inputs without adequate validation, creating a scenario where attackers can manipulate session data directly. This behavior aligns with CWE-613, which describes insufficient session validation, and represents a direct threat to session integrity and user authentication. The vulnerability enables session fixation attacks where an attacker can establish a session with a known identifier, potentially gaining unauthorized access to user accounts or maintaining persistent access to protected resources.
The operational impact of this vulnerability extends beyond simple authentication bypasses, creating potential for widespread security breaches across applications utilizing affected GoFiber versions. Applications that rely on session presence as a security control mechanism face significant risk, as attackers can create sessions with predetermined identifiers and then attempt to exploit these sessions for unauthorized access. This vulnerability particularly affects web applications implementing session-based authentication, where session identifiers serve as the primary means of user identification and authorization. The risk is compounded when applications do not implement additional session validation mechanisms or proper session lifecycle management, creating an environment where session hijacking and unauthorized access become trivially achievable.
Security practitioners should recognize this vulnerability as a critical threat requiring immediate remediation, particularly in environments where session-based authentication is implemented. The fix implemented in version 2.52.5 addresses the core issue by enforcing proper session identifier generation and validation, ensuring that session IDs are securely generated by the server rather than accepted from client-supplied inputs. Organizations should prioritize upgrading to version 2.52.5 or higher as the primary mitigation strategy, as this resolves the fundamental architectural flaw in the session middleware. Alternative workarounds include implementing additional validation layers to prevent client-supplied session IDs, regular session rotation policies, and strict session expiration controls that can help reduce the window of opportunity for exploitation while maintaining operational continuity.
The vulnerability demonstrates the importance of proper input validation and secure session management in web application frameworks, highlighting how seemingly minor implementation flaws can create significant security risks. Organizations using GoFiber should conduct comprehensive security assessments of their applications to identify potential exploitation vectors and ensure that all session-related components properly enforce secure session handling practices. The fix addresses core principles of secure session management as outlined in the OWASP Top Ten and NIST cybersecurity frameworks, emphasizing the need for server-side session identifier generation and proper session lifecycle management. This vulnerability serves as a reminder of the critical importance of maintaining up-to-date security practices and the potential consequences of failing to address known vulnerabilities in widely-used web frameworks.