CVE-2023-20872 in Workstation
Summary
by MITRE • 04/26/2023
VMware Workstation and Fusion contain an out-of-bounds read/write vulnerability in SCSI CD/DVD device emulation.
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Analysis
by VulDB Data Team • 09/01/2025
The vulnerability identified as CVE-2023-20872 resides within VMware Workstation and Fusion virtualization platforms, specifically affecting the SCSI CD/DVD device emulation functionality. This issue represents a critical security flaw that could potentially allow malicious actors to exploit the virtual environment through improper memory handling during optical device operations. The vulnerability manifests when the virtual SCSI CD/DVD controller processes certain input data, leading to unauthorized memory access patterns that could be leveraged for arbitrary code execution or system compromise.
The technical root cause of this vulnerability stems from inadequate bounds checking within the SCSI device emulation code. When a virtual machine processes CD/DVD image files through the SCSI interface, the system fails to properly validate the length and structure of incoming data packets. This oversight creates opportunities for out-of-bounds read/write operations where attacker-controlled data can cause the virtual machine to access memory locations beyond the intended buffer boundaries. Such memory corruption vulnerabilities typically fall under CWE-129 or CWE-787 classifications, representing weaknesses in input validation and memory safety mechanisms. The flaw operates at the virtualization layer where guest operating systems interact with emulated hardware components, making it particularly dangerous as it can be exploited from within the guest environment to affect the host system.
The operational impact of this vulnerability extends beyond simple data corruption, as it can enable privilege escalation and arbitrary code execution within the virtualized environment. Attackers could potentially leverage this vulnerability to execute malicious code with the privileges of the virtual machine process, which might translate to host system compromise depending on the virtualization setup and privilege levels. The vulnerability affects both VMware Workstation and Fusion products, indicating a widespread exposure across different virtualization deployment scenarios including enterprise environments, development workstations, and desktop virtualization setups. This type of vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as attackers could use the compromised virtual environment to establish persistent access or escalate privileges.
Mitigation strategies for CVE-2023-20872 should prioritize immediate patch application from VMware, as the vendor has released security updates addressing the specific bounds checking issues in the SCSI device emulation code. Organizations should implement network segmentation to limit exposure of virtualized environments to untrusted networks, while also monitoring for suspicious virtual machine activity that might indicate exploitation attempts. Additional protective measures include disabling unnecessary virtual CD/DVD drives in virtual machines, implementing strict access controls for virtualization management interfaces, and maintaining regular backup procedures to ensure rapid recovery in case of successful exploitation. Security teams should also consider implementing virtual machine integrity monitoring solutions that can detect anomalous memory access patterns or unexpected code execution within virtual environments. The vulnerability demonstrates the importance of thorough input validation in virtualization components and highlights the critical need for regular security assessments of hypervisor and guest operating system interactions to prevent similar issues from arising in future deployments.