CVE-2022-31693: VMware Tools for Windows DoS Vulnerability

CVE-2022-31693 Overview

CVE-2022-31693 is a denial-of-service vulnerability affecting VMware Tools for Windows. The vulnerability exists within the VM3DMP driver, a component responsible for 3D graphics acceleration in Windows guest operating systems running on VMware virtualization platforms. A malicious actor with local user privileges in the Windows guest OS where VMware Tools is installed can trigger a PANIC condition in the VM3DMP driver, leading to a denial-of-service condition that crashes the Windows guest OS.

Critical Impact

Local attackers with user-level access can crash Windows guest virtual machines by triggering a kernel panic in the VM3DMP graphics driver, causing service disruption and potential data loss.

Affected Products

• VMware Tools for Windows 12.x.y prior to 12.1.5
• VMware Tools for Windows 11.x.y (all versions)
• VMware Tools for Windows 10.x.y (all versions)

Discovery Timeline

• 2023-06-07 - CVE CVE-2022-31693 published to NVD
• 2025-01-07 - Last updated in NVD database

Technical Details for CVE-2022-31693

Vulnerability Analysis

This vulnerability resides in the VM3DMP driver, which is a kernel-mode driver that VMware Tools installs on Windows guest operating systems to provide 3D graphics acceleration capabilities. The driver acts as an interface between the guest OS and the VMware hypervisor's virtual graphics hardware.

The core issue involves improper resource handling (CWE-404) within the driver code. When specific conditions are triggered by a local user, the driver fails to properly manage its resources, resulting in a kernel panic. This panic condition causes an immediate system crash, effectively denying service to all applications and users of the affected Windows guest VM.

The attack requires local access to the guest operating system but does not require administrative privileges. Any authenticated user on the Windows guest can potentially exploit this vulnerability to crash the system. While this does not allow code execution or privilege escalation, the availability impact is significant as it can completely disrupt operations running on the affected virtual machine.

Root Cause

The vulnerability stems from improper resource release (CWE-404) within the VM3DMP driver. The driver fails to properly handle certain resource management operations, which can lead to an unrecoverable kernel panic condition. This type of flaw typically occurs when driver code does not correctly validate inputs or manage state transitions, causing the kernel to enter an inconsistent state from which it cannot recover.

Attack Vector

The attack vector is local, meaning an attacker must have authenticated access to the Windows guest operating system. The attack complexity is low, and no user interaction is required beyond the attacker's own actions. The exploitation flow involves:

1. Attacker gains local user access to a Windows guest VM with VMware Tools installed
2. Attacker executes operations that interact with the VM3DMP driver in an unexpected manner
3. The VM3DMP driver fails to properly handle the input, triggering a kernel panic
4. The Windows guest OS crashes, denying service to all users and applications

The vulnerability specifically targets the availability of the system without affecting confidentiality or integrity. This makes it particularly useful for sabotage scenarios or as part of a multi-stage attack where disrupting a specific VM serves a broader objective.

Detection Methods for CVE-2022-31693

Indicators of Compromise

• Windows guest VMs experiencing unexpected Blue Screen of Death (BSOD) crashes with VM3DMP.sys in the crash dump
• Repeated system restarts of Windows guest machines without clear cause
• Event log entries indicating kernel panic or driver failure involving VM3DMP components
• Unusual patterns of user activity preceding VM crashes

Detection Strategies

• Monitor Windows Event Logs for system crashes referencing VM3DMP.sys or related VMware Tools drivers
• Implement crash dump analysis to identify VM3DMP driver as the source of kernel panics
• Deploy endpoint detection and response (EDR) solutions to correlate user activity with subsequent system crashes
• Create alerts for multiple VM crashes within a short timeframe that may indicate deliberate exploitation

Monitoring Recommendations

• Configure centralized logging to capture Windows guest crash events and driver failures
• Enable VMware vCenter alerts for unexpected guest OS shutdowns or restarts
• Implement SentinelOne Singularity Platform for real-time kernel-level monitoring on Windows guest VMs
• Review VMware Tools version inventory regularly to identify unpatched systems

How to Mitigate CVE-2022-31693

Immediate Actions Required

• Upgrade VMware Tools to version 12.1.5 or later on all affected Windows guest VMs
• Inventory all Windows guests running VMware Tools versions 10.x.y, 11.x.y, or 12.x.y prior to 12.1.5
• Prioritize patching on systems with multi-user access or exposed to less-trusted users
• Consider temporarily restricting local access to critical VMs until patching is complete

Patch Information

VMware has released VMware Tools version 12.1.5 which addresses this vulnerability. The fix is documented in VMware Security Advisory VMSA-2022-0029. Organizations should download the updated VMware Tools package from VMware's official download portal and deploy it to all affected Windows guest operating systems.

Additional information is available from NetApp Security Advisory NTAP-20221223-0009 for environments running NetApp products with VMware integration.

Workarounds

• Restrict local user access to Windows guest VMs to only trusted administrators where possible
• Implement strong access controls and authentication requirements for guest VM access
• Consider disabling 3D graphics acceleration in VMware settings if not required for business operations
• Monitor and log all user authentication events on affected Windows guest VMs

# VMware Tools upgrade verification (run in Windows guest PowerShell)
# Check current VMware Tools version
Get-WmiObject -Class Win32_Product | Where-Object {$_.Name -like "*VMware Tools*"} | Select-Object Name, Version

# Verify VM3DMP driver version after upgrade
Get-WindowsDriver -Online | Where-Object {$_.OriginalFileName -like "*vm3dmp*"} | Select-Object Driver, Version