CVE-2019-9630 in Nexus Repository Manager
Summary
by MITRE
Sonatype Nexus Repository Manager before 3.17.0 has a weak default of giving any unauthenticated user read permissions on the repository files and images.
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Analysis
by VulDB Data Team • 10/18/2023
The vulnerability identified as CVE-2019-9630 affects Sonatype Nexus Repository Manager versions prior to 3.17.0, representing a critical security flaw in access control mechanisms. This issue stems from the software's default configuration where unauthenticated users are granted read permissions on repository files and images, effectively creating an unauthorized access vector that undermines the fundamental security posture of the repository management system. The flaw exists at the authentication and authorization layer, where the default security settings fail to properly enforce access controls, allowing any individual with network access to potentially retrieve sensitive artifacts and components stored within the repository.
The technical implementation of this vulnerability resides in the repository manager's permission model and default configuration parameters. When Nexus Repository Manager is deployed without proper security hardening, the system defaults to a permissive access policy that does not adequately distinguish between authenticated and unauthenticated users. This misconfiguration allows attackers to bypass authentication mechanisms and directly access repository contents, including proprietary code artifacts, dependency libraries, and potentially sensitive configuration files. The vulnerability is particularly concerning because it affects the core functionality of the repository manager, making it a critical component in any software supply chain security posture.
The operational impact of this vulnerability extends beyond simple unauthorized data access, as it can enable more sophisticated attack vectors within software development environments. An attacker who discovers this vulnerability can enumerate repository contents, potentially identifying version numbers, component dependencies, and even sensitive information embedded within artifacts. This reconnaissance capability can lead to further exploitation opportunities, including supply chain attacks where attackers might replace legitimate components with malicious versions. The vulnerability directly violates security principles outlined in the CWE-284 access control weakness category, specifically addressing improper access control where system resources are accessible without proper authentication and authorization. Organizations utilizing Nexus Repository Manager in production environments face significant risk of intellectual property theft, supply chain compromise, and potential regulatory violations due to the exposure of sensitive repository contents.
Mitigation strategies for CVE-2019-9630 require immediate action to address the default configuration vulnerability. The primary recommendation involves upgrading to Nexus Repository Manager version 3.17.0 or later, which implements proper default access controls that prevent unauthenticated users from accessing repository contents. Organizations should also implement additional security measures including enforcing mandatory authentication for all repository access, configuring proper access control lists, and implementing network segmentation to limit access to repository systems. The ATT&CK framework categorizes this vulnerability under the privilege escalation and credential access domains, where attackers can leverage weak access controls to gain unauthorized access to sensitive data. Security teams should conduct comprehensive audits of their repository configurations, implement regular security assessments, and establish monitoring procedures to detect unauthorized access attempts. The remediation process must include proper configuration management practices and adherence to security baseline standards such as those defined by NIST SP 800-53, which emphasize the importance of proper access control and authentication mechanisms in protecting information systems.