CVE-2023-32004 in Node.js
Summary
by MITRE • 08/15/2023
A vulnerability has been discovered in Node.js version 20, specifically within the experimental permission model. This flaw relates to improper handling of Buffers in file system APIs causing a traversal path to bypass when verifying file permissions. This vulnerability affects all users using the experimental permission model in Node.js 20. Please note that at the time this CVE was issued, the permission model is an experimental feature of Node.js.
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Analysis
by VulDB Data Team • 05/08/2025
The vulnerability identified as CVE-2023-32004 resides within Node.js version 20's experimental permission model, representing a critical security flaw that undermines the integrity of file system access controls. This issue specifically targets the handling of Buffer objects within file system APIs, creating a path traversal bypass mechanism that allows unauthorized access to files and directories. The experimental nature of the permission model at the time of discovery does not diminish the severity of this vulnerability, as it fundamentally compromises the security assumptions that developers rely upon when implementing access controls. The flaw manifests when the system fails to properly validate file paths during buffer operations, enabling malicious actors to circumvent intended permission boundaries through carefully crafted input sequences.
Technical exploitation of this vulnerability occurs through the improper processing of Buffer objects in file system operations, where the permission checking mechanism fails to adequately sanitize or validate the traversal paths. When Node.js processes file system calls involving Buffers, the experimental permission model does not correctly enforce path restrictions, allowing attackers to navigate beyond the intended file system boundaries. This behavior creates a direct pathway for privilege escalation and unauthorized data access, as the system's permission validation logic becomes ineffective against specific buffer-based traversal patterns. The vulnerability essentially enables attackers to bypass security checks that should prevent access to restricted files or directories, making it particularly dangerous in environments where strict access controls are required.
The operational impact of CVE-2023-32004 extends beyond simple unauthorized access, as it fundamentally undermines the security posture of applications relying on Node.js 20's experimental permission model. Organizations using this feature face potential data breaches, privilege escalation attacks, and unauthorized system modifications that could lead to complete system compromise. The vulnerability affects all users of the experimental permission model, meaning that any application implementing this security feature becomes vulnerable to exploitation regardless of the specific use case or implementation details. This broad impact makes the vulnerability particularly concerning for enterprise environments where Node.js applications handle sensitive data and require robust access controls. The experimental status of the feature does not provide adequate protection against exploitation, as developers may assume that experimental features are less likely to contain critical security flaws.
Mitigation strategies for CVE-2023-32004 primarily focus on avoiding the use of the experimental permission model until a patched version is available, as this represents the most effective immediate solution. Organizations should implement comprehensive monitoring of file system access patterns to detect potential exploitation attempts and establish robust incident response procedures. The vulnerability aligns with CWE-22 Path Traversal and CWE-732 Incorrect Permission Assignment, highlighting the fundamental flaws in path validation and permission handling within the Node.js implementation. Security teams should also consider implementing additional layers of protection such as application firewalls, input validation, and regular security audits of Node.js applications. The ATT&CK framework categorizes this vulnerability under privilege escalation and defense evasion techniques, as attackers can use it to bypass security controls and maintain persistent access to systems. Until official patches are released, developers should refrain from deploying applications that rely on the experimental permission model in production environments where security is paramount.