CVE-2021-43832 in Spinnaker
Summary
by MITRE • 01/04/2022
Spinnaker is an open source, multi-cloud continuous delivery platform. Spinnaker has improper permissions allowing pipeline creation & execution. This lets an arbitrary user with access to the gate endpoint to create a pipeline and execute it without authentication. If users haven't setup Role-based access control (RBAC) with-in spinnaker, this enables remote execution and access to deploy almost any resources on any account. Patches are available on the latest releases of the supported branches and users are advised to upgrade as soon as possible. Users unable to upgrade should enable RBAC on ALL accounts and applications. This mitigates the ability of a pipeline to affect any accounts. Block application access unless permission are enabled. Users should make sure ALL application creation is restricted via appropriate wildcards.
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Analysis
by VulDB Data Team • 01/06/2022
CVE-2021-43832 represents a critical authorization flaw in Spinnaker, a widely adopted multi-cloud continuous delivery platform that enables automated deployment workflows across various cloud environments. This vulnerability stems from improper permission controls within the Spinnaker Gate component, which serves as the primary API gateway for the platform. The flaw allows unauthenticated users who can reach the Gate endpoint to bypass normal access controls and create or execute pipelines without proper authentication. This represents a fundamental breakdown in Spinnaker's security model, as the platform's core delivery mechanisms become accessible to any external actor with network access to the Gate service.
The technical nature of this vulnerability aligns with CWE-285, which addresses improper authorization issues in software systems. The flaw specifically affects Spinnaker's access control implementation by failing to validate user credentials or roles before permitting pipeline operations. When RBAC is not properly configured within Spinnaker, the vulnerability becomes particularly dangerous as it creates a path for remote code execution and unauthorized resource deployment. Attackers can leverage this weakness to execute arbitrary pipeline commands, potentially leading to unauthorized deployments, data manipulation, or infrastructure compromise across all accounts and applications that lack proper access controls.
The operational impact of CVE-2021-43832 extends beyond simple unauthorized access, as it fundamentally undermines the security posture of organizations relying on Spinnaker for their deployment processes. Without proper RBAC implementation, any authenticated user can create and execute pipelines that may deploy malicious code, modify production environments, or access sensitive resources across multiple cloud accounts. This vulnerability enables attackers to perform actions that would normally require elevated privileges or specific roles, essentially providing a backdoor for privilege escalation. The risk is compounded in multi-cloud environments where a single compromised Spinnaker instance could potentially affect deployments across multiple cloud providers and account boundaries.
Organizations should implement immediate mitigation strategies to address this vulnerability, with the most effective approach being the mandatory upgrade to patched versions of Spinnaker. The recommended remediation includes enabling comprehensive RBAC across all accounts and applications, which aligns with ATT&CK technique T1078 for valid accounts and T1566 for credential access. Additionally, network-level controls should be implemented to restrict access to the Gate endpoint, ensuring that only authorized systems can communicate with the Spinnaker API. Application creation should be restricted through appropriate wildcard configurations, and all pipeline operations should be validated against proper access controls before execution. The vulnerability's exploitation risk is significantly reduced when proper security controls are in place, as demonstrated by the ATT&CK framework's emphasis on access control and privilege management as critical defensive measures.