CVE-2022-24450 in nats-server
Summary
by MITRE • 02/08/2022
NATS nats-server before 2.7.2 has Incorrect Access Control. Any authenticated user can obtain the privileges of the System account by misusing the "dynamically provisioned sandbox accounts" feature.
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Analysis
by VulDB Data Team • 03/30/2026
The vulnerability identified as CVE-2022-24450 affects the NATS nats-server software version 2.7.2 and earlier, representing a critical access control flaw that undermines the security model of the messaging system. This issue specifically targets the dynamically provisioned sandbox accounts feature, which was designed to provide isolated execution environments for users while maintaining system security boundaries. The flaw allows authenticated users to escalate their privileges and gain access to system-level capabilities that should be restricted to the System account only.
The technical implementation of this vulnerability stems from improper access control mechanisms within the NATS server's account management system. When users authenticate to the system, they are typically assigned specific account privileges based on their authentication credentials and role assignments. However, the flawed implementation of the sandbox account provisioning feature creates a path where authenticated users can manipulate their account context to effectively assume the privileges of the System account. This occurs through the misuse of account provisioning APIs or configuration parameters that should be restricted to administrative functions.
The operational impact of this vulnerability is severe as it enables authenticated attackers to bypass normal security controls and gain elevated privileges within the NATS messaging infrastructure. Once an attacker successfully exploits this vulnerability, they can perform actions such as managing other users' accounts, accessing sensitive system configuration data, modifying message routing rules, and potentially disrupting the entire messaging service. The System account typically possesses the highest level of privileges within NATS, including the ability to manage all other accounts and access all system resources, making this escalation particularly dangerous for organizations relying on NATS for critical messaging operations.
Organizations using affected versions of NATS nats-server should immediately upgrade to version 2.7.2 or later, which includes patches addressing this access control flaw. Additionally, administrators should review existing account configurations and implement strict access controls for the sandbox account provisioning feature. The vulnerability aligns with CWE-284, which describes improper access control in software systems, and represents a clear violation of the principle of least privilege that should be enforced in all security-critical applications. From an adversarial perspective, this vulnerability would likely be categorized under ATT&CK technique T1078 for valid accounts and T1548.001 for abuse of privileges, as it allows attackers to leverage legitimate authentication mechanisms to gain elevated system access.
The root cause of this vulnerability demonstrates a failure in the security architecture's principle of privilege separation, where the sandbox account provisioning mechanism was not properly constrained to prevent privilege escalation. The fix implemented in version 2.7.2 addresses the specific flaw by ensuring that the dynamic account provisioning feature cannot be misused to assume system-level privileges, thereby restoring the proper security boundaries within the NATS messaging system. Organizations should also consider implementing network segmentation and monitoring for unusual account provisioning activities as additional defensive measures against potential exploitation of this and similar vulnerabilities.