CVE-2011-4316 in Enterprise Virtualization Manager
Summary
by MITRE
Red Hat Enterprise Virtualization Manager (RHEV-M) before 3.1, in certain unspecified conditions, does not lock the desktop screen between SPICE sessions, which allows local users with access to a virtual machine to gain access to other users desktop sessions via unspecified vectors.
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Analysis
by VulDB Data Team • 12/21/2021
The vulnerability identified as CVE-2011-4316 affects Red Hat Enterprise Virtualization Manager versions prior to 3.1, specifically within the SPICE (Simple Protocol for Independent Computing Environments) session management framework. This security flaw represents a critical desktop session isolation failure that undermines the fundamental security principles of virtualized environments where multiple users share the same physical infrastructure. The issue manifests when the system fails to properly implement screen locking mechanisms between SPICE sessions, creating a direct pathway for privilege escalation and unauthorized access to sensitive user desktop environments.
This vulnerability stems from inadequate session management controls within the RHEV-M hypervisor layer, where the desktop lock mechanism that should separate user sessions is bypassed under certain unspecified conditions. The technical implementation flaw lies in the failure to maintain proper session boundaries between virtual desktop instances, allowing local users who have access to one virtual machine to potentially access other users' desktop sessions through unspecified attack vectors. The underlying cause can be categorized as a weakness in session management and access control enforcement, which aligns with CWE-284 Access Control Issues and specifically addresses improper access control mechanisms within virtualized computing environments.
The operational impact of this vulnerability is severe and multifaceted, as it enables unauthorized access to potentially sensitive user data, applications, and system resources within virtualized environments. Attackers could exploit this flaw to access other users' desktop sessions, potentially gaining access to confidential information, credentials, or system administration privileges. This vulnerability directly impacts the principle of least privilege and violates the fundamental security assumptions of virtualized computing environments where user isolation is paramount. The risk is particularly elevated in enterprise environments where multiple users share the same virtualization infrastructure and where sensitive business data may be processed within virtual desktop sessions.
Mitigation strategies for this vulnerability require immediate implementation of the vendor-provided security patches and updates for RHEV-M versions prior to 3.1. Organizations should also implement additional network-level controls and access restrictions to limit local user access to virtualized environments where possible. The remediation process should include thorough security configuration reviews of SPICE session management settings and implementation of proper session timeout mechanisms. Security teams must also conduct comprehensive vulnerability assessments to identify any other potential session management weaknesses within their virtualization infrastructure. This vulnerability demonstrates the critical importance of maintaining up-to-date virtualization management systems and implementing robust session isolation controls as part of overall cybersecurity defense in depth strategies, aligning with ATT&CK technique T1078 Valid Accounts and T1566 Phishing to ensure proper access control enforcement.