CVE-2024-51479 is a high-severity vulnerability identified in Vercel's Next.js framework, which is widely used for building full-stack web applications. This vulnerability allows attackers to bypass authorization checks in applications performing authorization based on the pathname. Specifically, if the application is hosted on Vercel, the authorization can be bypassed for pages directly under the root directory.
For instance, an application may be secure at the root URL (e.g., `https://example.com/`), yet vulnerable at direct child pages such as `https://example.com/foo`. This flaw poses a substantial risk to organizations relying on Next.js for their web applications, especially considering the potential for unauthorized access to sensitive resources.
The vulnerability has been assigned a CVSS score of 7.5, categorizing it as high severity. Organizations utilizing affected Next.js versions should prioritize patching to the latest version, specifically version 14.2.15 or later, where this issue has been addressed. Importantly, if hosted on Vercel, the vulnerability has been automatically mitigated regardless of the Next.js version in use.
Risk to organizations includes unauthorized access to sensitive data, which could lead to data breaches or compromised application integrity. This highlights the urgent need for organizations to patch their systems immediately to prevent exploitation.
There are no known public exploits for this vulnerability as of now, but the potential for exploitation exists, making timely remediation crucial.
Vulnerability Details
The vulnerability in question affects Next.js, a React framework developed by Vercel for creating full-stack web applications. It allows for authorization bypass when the middleware is improperly configured based on pathnames.
The official description states that in versions prior to 14.2.15, the authorization mechanism may not function as intended for certain URLs, allowing unauthorized access to resources. The issue has been classified under CWE-285 (Improper Authorization) and CWE-863 (Incorrect Authorization).
The vulnerability was published on December 17, 2024. Organizations should ensure they are running version 14.2.15 or later to mitigate this risk.
Technical Analysis
The root cause of CVE-2024-51479 lies in the authorization checks that rely on pathnames within the middleware. This flaw allows attackers to exploit the authorization mechanism, especially for endpoints immediately beneath the application root directory.
The attack vector is classified as network-based, with a low complexity level, requiring no privileges or user interaction for exploitation. The confidentiality impact is rated as high, while integrity and availability impacts are rated as none.
Risk & Impact Analysis
Organizations deploying Next.js applications must consider the real-world risks associated with this vulnerability. The potential for unauthorized access to sensitive data directly impacts the trustworthiness and security posture of affected applications.
The vulnerability could lead to significant breaches, especially for applications handling personal or confidential information. Additionally, the likelihood of exploitation is compounded by the high impact on confidentiality.
Given that the vulnerability has a high CVSS score, organizations should prioritize patching immediately to prevent possible data breaches or unauthorized access.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects all versions of Next.js prior to 14.2.15. Organizations are advised to upgrade to the latest version to ensure protection against this vulnerability.
Mitigation & Remediation
To remediate this vulnerability, organizations must update their Next.js applications to version 14.2.15 or later. If your application is hosted on Vercel, the vulnerability has been automatically mitigated, regardless of the Next.js version.
In cases where updating is not immediately feasible, organizations should consider implementing additional security measures such as restricting access to sensitive routes and conducting thorough security testing to identify any potential exposure.
For further information on penetration testing, organizations may refer to our penetration testing services to validate security configurations and ensure resilience against similar vulnerabilities.
Detection Guidance
Organizations should monitor logs for any unauthorized access attempts to sensitive pages, particularly those that could be affected by this vulnerability. Behavioral anomalies in user activity may also serve as indicators of exploitation.
AppSecure Threat Intelligence Insight
This vulnerability serves as a critical reminder of the importance of robust authorization mechanisms in web applications. The trend of vulnerabilities related to improper authorization continues to pose significant risks to organizations.
Security teams should ensure that authorization checks are comprehensive and resilient against path-based bypass attempts. Regular code reviews and security assessments can help identify and mitigate these risks.
For more insights into vulnerability management, organizations can refer to our vulnerability management program design resources.
Additionally, organizations can enhance their security posture by reviewing our penetration testing methodology to better understand how to identify and remediate vulnerabilities effectively.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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