CVE-2017-4900 in Workstation Pro
Summary
by MITRE
VMware Workstation Pro/Player 12.x before 12.5.3 contains a NULL pointer dereference vulnerability that exists in the SVGA driver. Successful exploitation of this issue may allow attackers with normal user privileges to crash their VMs.
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 08/18/2020
The vulnerability identified as CVE-2017-4900 represents a critical NULL pointer dereference flaw within the SVGA driver component of VMware Workstation Pro and Player versions 12.x prior to 12.5.3. This issue resides in the graphics virtualization subsystem that handles display operations for virtual machines, making it a significant concern for users who rely on VMware's desktop virtualization platform. The vulnerability specifically affects the SVGA (Simple Virtual Graphics Adapter) driver which is responsible for rendering graphics within virtual environments and managing the communication between the guest operating system and the host's graphics hardware.
The technical implementation of this flaw occurs when the SVGA driver fails to properly validate pointer references during graphics processing operations within the virtual machine environment. When a malicious user or attacker crafts specific graphics operations that trigger the driver's handling of null references, the system attempts to dereference a null pointer, causing an immediate crash of the virtual machine. This behavior stems from inadequate input validation and error handling mechanisms within the driver's code structure, which violates fundamental security principles of robust software design. The vulnerability operates at the kernel level within the virtualization layer, making it particularly dangerous as it can potentially be exploited to cause system instability or denial of service conditions that impact the entire virtualization environment.
From an operational impact perspective, this vulnerability allows attackers with minimal privileges to execute a denial of service attack against virtual machines running on affected VMware products. The exploitation process requires only normal user privileges, meaning that any user with access to the virtual machine environment can potentially trigger the crash condition. This makes the vulnerability particularly concerning for enterprise environments where multiple users share virtualization infrastructure, as a single malicious user could disrupt operations for other users. The impact extends beyond simple service disruption to include potential data loss scenarios, especially if virtual machines are in the middle of critical operations when they crash. The vulnerability also represents a potential stepping stone for more sophisticated attacks, as the instability created could be leveraged to create conditions favorable for additional exploitation attempts.
Security professionals should recognize this vulnerability as aligning with CWE-476, which specifically addresses NULL pointer dereference conditions in software implementations. The flaw also demonstrates characteristics consistent with ATT&CK technique T1499.001, which involves disruption of services through resource exhaustion or system instability. Organizations should implement immediate mitigation strategies including prompt patch deployment to VMware Workstation Pro and Player versions 12.5.3 or later, which contain the necessary fixes for the SVGA driver's pointer validation mechanisms. Additional protective measures include implementing network segmentation to limit access to virtualization environments, monitoring for unusual VM crash patterns, and establishing robust incident response procedures for handling virtualization-related disruptions. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date virtualization software and implementing proper security controls around privileged access to virtual environments.