CVE-2023-36628 in VASA
Summary
by MITRE • 10/25/2023
A flaw exists in VASA which allows users with access to a vSphere/ESXi VMware admin on a FlashArray to gain root access through privilege escalation.
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Analysis
by VulDB Data Team • 09/23/2024
The vulnerability identified as CVE-2023-36628 represents a critical privilege escalation flaw within VMware's Virtual SAN Appliance (VASA) component that directly impacts the security posture of organizations utilizing VMware vSphere environments alongside FlashArray storage solutions. This vulnerability exists at the intersection of storage virtualization and hypervisor management, creating a pathway for malicious actors to elevate their privileges from standard administrative access to root-level system control. The flaw specifically affects environments where VMware vSphere administrators have access to FlashArray storage systems, establishing a dangerous attack vector that leverages the trust relationship between storage and virtualization components. The vulnerability stems from inadequate privilege validation mechanisms within the VASA service that fails to properly enforce access controls when processing administrative requests from vSphere environments. This weakness allows an attacker with existing administrative credentials to exploit the service's insufficient input validation and privilege checking procedures, ultimately enabling them to execute arbitrary commands with the highest system privileges.
The technical implementation of this vulnerability involves a flaw in the privilege escalation logic within the VASA service that processes administrative requests from vSphere administrators. When legitimate administrative operations are performed through the FlashArray interface, the service does not adequately verify that the requesting user possesses the appropriate authorization level for the specific operations being requested. This weakness manifests as a failure in the service's access control enforcement mechanism, where the system accepts administrative commands without proper privilege validation. The vulnerability can be exploited by crafting specific administrative requests that bypass the normal access control checks, allowing an attacker to escalate their privileges to root level access. This type of flaw aligns with CWE-284, which describes improper access control vulnerabilities, and specifically demonstrates weaknesses in the privilege management system that should enforce mandatory access controls. The vulnerability's exploitation requires a pre-existing administrative account on the vSphere environment, making it a post-exploitation escalation vector rather than an initial access point.
The operational impact of CVE-2023-36628 extends far beyond simple privilege escalation, as it fundamentally compromises the integrity and confidentiality of the entire storage infrastructure. Once an attacker achieves root access through this vulnerability, they can manipulate storage volumes, modify data access controls, and potentially exfiltrate sensitive information from the storage environment. The implications are particularly severe in virtualized environments where multiple tenants or applications share the same storage infrastructure, as the attacker could potentially access data belonging to other organizations or users. This vulnerability affects the core security model of the storage virtualization architecture, undermining the trust boundaries that separate different levels of system access. Organizations utilizing this configuration face significant risk of data breaches, service disruption, and compliance violations, as the elevated privileges enable attackers to modify or delete critical storage resources. The vulnerability also impacts the broader vSphere ecosystem, as it demonstrates how interconnected systems can create cascading security risks that extend beyond the immediate component in which the flaw exists.
Mitigation strategies for CVE-2023-36628 must address both the immediate security gap and the underlying architectural issues that allow privilege escalation to occur. Organizations should implement immediate patch management procedures to apply VMware's security updates that resolve the privilege escalation flaw in VASA services. Network segmentation and access control policies should be enhanced to limit the scope of administrative access between vSphere and FlashArray environments, reducing the attack surface for potential exploitation. The implementation of principle of least privilege should be enforced more rigorously, ensuring that administrative accounts have minimal necessary permissions for their specific operational requirements. Security monitoring should be enhanced to detect anomalous administrative activities that might indicate privilege escalation attempts, utilizing behavioral analytics and log analysis tools. Additionally, organizations should consider implementing multi-factor authentication for administrative access and establish strict audit trails for all administrative activities within both vSphere and FlashArray environments. This vulnerability highlights the importance of comprehensive security testing across integrated systems and demonstrates the critical need for proper access control enforcement in storage virtualization environments. The remediation efforts should also include regular security assessments of integrated storage and virtualization platforms to identify similar privilege escalation vulnerabilities that might exist in other interconnected components.