CVE-2016-3085 in CloudStack
Summary
by MITRE
Apache CloudStack 4.5.x before 4.5.2.1, 4.6.x before 4.6.2.1, 4.7.x before 4.7.1.1, and 4.8.x before 4.8.0.1, when SAML-based authentication is enabled and used, allow remote attackers to bypass authentication and access the user interface via vectors related to the SAML plugin.
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Analysis
by VulDB Data Team • 08/23/2022
Apache CloudStack represents a comprehensive cloud computing platform that manages virtualized infrastructure through a web-based interface. The vulnerability described in CVE-2016-3085 specifically targets the SAML-based authentication mechanism that enables single sign-on functionality within the platform. This authentication method allows users to access CloudStack services through external identity providers, creating a seamless integration between enterprise identity management systems and cloud infrastructure. The affected versions span multiple release lines including 4.5.x, 4.6.x, 4.7.x, and 4.8.x, indicating a widespread issue that impacted various generations of the CloudStack platform. The vulnerability manifests when SAML authentication is enabled and actively used, making it particularly concerning for organizations that rely on external authentication systems for their cloud environments.
The technical flaw resides in the SAML plugin implementation within CloudStack, where insufficient validation occurs during the authentication process. Attackers can exploit this weakness to bypass the authentication mechanism entirely, gaining unauthorized access to the user interface without proper credentials. This type of vulnerability falls under the category of authentication bypass issues, which are classified as CWE-287 in the Common Weakness Enumeration system. The attack vector specifically involves manipulating the SAML authentication flow, potentially through crafted requests or by exploiting improper session handling within the plugin. The vulnerability's impact extends beyond simple unauthorized access, as it allows attackers to perform administrative functions and manipulate cloud resources through the compromised interface.
The operational impact of this vulnerability is severe for organizations relying on CloudStack for their infrastructure management. Attackers who successfully exploit this vulnerability can gain full administrative access to cloud environments, potentially leading to data breaches, resource misconfiguration, service disruption, and unauthorized cloud resource consumption. The vulnerability affects the core security model of CloudStack when SAML authentication is in use, undermining the trust model that organizations place in external identity providers. Organizations may experience unauthorized access to virtual machines, storage volumes, network configurations, and other critical cloud resources. The risk is particularly elevated in enterprise environments where CloudStack serves as a central management platform for cloud infrastructure, as this single vulnerability can provide attackers with comprehensive access to the entire cloud deployment.
Mitigation strategies for CVE-2016-3085 involve immediate patching of affected CloudStack installations to versions 4.5.2.1, 4.6.2.1, 4.7.1.1, or 4.8.0.1 respectively. Organizations should also implement network-level controls to restrict access to CloudStack interfaces, particularly when SAML authentication is enabled. Security monitoring should be enhanced to detect unusual authentication patterns or unauthorized access attempts. The ATT&CK framework categorizes this vulnerability under privilege escalation and credential access techniques, making it important for security teams to monitor for indicators of compromise related to authentication bypass activities. Organizations should also consider implementing additional authentication layers or multi-factor authentication mechanisms to reduce the attack surface. Regular security assessments of cloud infrastructure components, particularly authentication plugins, are essential to identify similar vulnerabilities. The vulnerability highlights the importance of proper input validation and session management in authentication systems, aligning with security best practices outlined in NIST SP 800-53 and ISO 27001 standards for cloud security controls.