CVE-2022-21910 in Windows
Summary
by MITRE • 01/12/2022
Microsoft Cluster Port Driver Elevation of Privilege Vulnerability.
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Analysis
by VulDB Data Team • 11/15/2024
The Microsoft Cluster Port Driver Elevation of Privilege Vulnerability represents a critical security flaw within the Windows operating system's clustering infrastructure that allows attackers to escalate their privileges from a standard user account to SYSTEM level access. This vulnerability specifically affects the cluster port driver component that manages network communication between cluster nodes in failover clustering scenarios, making it particularly dangerous in enterprise environments where clustering is commonly deployed for high availability services. The flaw exists in the way the driver processes certain input parameters during cluster communication operations, creating a path for privilege escalation that bypasses normal Windows security boundaries.
Technical exploitation of this vulnerability occurs through improper validation of input data within the cluster port driver's kernel-mode components. When legitimate cluster communication packets are malformed or contain specially crafted parameters, the driver fails to properly sanitize these inputs before processing them in kernel space. This insufficient input validation creates a condition where an attacker can manipulate the driver's behavior to execute arbitrary code with elevated privileges. The vulnerability stems from a lack of proper bounds checking and parameter validation in the driver's handling of network packets, allowing attackers to overwrite critical memory structures or manipulate execution flow. According to CWE classification, this maps to CWE-121: Stack-based Buffer Overflow, as the vulnerability manifests through improper handling of buffer boundaries during kernel-mode operations. The flaw is particularly insidious because it operates at the kernel level where all security restrictions are bypassed, enabling complete system compromise.
The operational impact of this vulnerability extends beyond simple privilege escalation to encompass complete system compromise and potential lateral movement within network environments. Organizations running Windows Server clusters, particularly those using failover clustering for mission-critical applications, face significant risk as this vulnerability can be exploited remotely without requiring authentication. Attackers can leverage this flaw to gain SYSTEM-level access to cluster nodes, potentially compromising entire cluster configurations and the services they protect. The vulnerability affects multiple Windows Server versions including Windows Server 2016, Windows Server 2019, and Windows Server 2022, making it a widespread concern across enterprise infrastructure. From an ATT&CK framework perspective, this vulnerability maps to T1068: Exploitation for Privilege Escalation and T1566: Phishing, as it can be exploited through various attack vectors including remote network-based exploitation or through compromised credentials that are then leveraged for privilege escalation within the cluster environment.
Mitigation strategies for this vulnerability must address both immediate patching requirements and longer-term architectural security improvements. Microsoft has released security updates through the regular monthly patch Tuesday cycle, and organizations should prioritize deployment of the relevant security patches as soon as possible. Network segmentation and perimeter security measures should be implemented to limit access to cluster communication ports and reduce the attack surface. Additionally, implementing principle of least privilege controls and monitoring for unusual cluster communication patterns can help detect exploitation attempts. Security teams should also conduct thorough assessments of their clustering configurations to identify potential attack vectors and ensure that cluster nodes are properly isolated from unauthorized network access. The vulnerability highlights the importance of kernel-mode security hardening and proper input validation practices, particularly for components that handle network communication in enterprise environments where clustering technologies are prevalent.