CVE-2023-35315 in Windows
Summary
by MITRE • 07/11/2023
Windows Layer-2 Bridge Network Driver Remote Code Execution Vulnerability
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Analysis
by VulDB Data Team • 07/29/2023
This vulnerability exists within the Windows Layer-2 Bridge Network Driver component that facilitates network virtualization and bridging operations between virtual and physical network interfaces. The flaw manifests as a memory corruption issue in how the driver processes certain network packets, specifically when handling malformed or crafted Layer-2 frames that are transmitted through the bridging functionality. This vulnerability maps to CWE-125 Out-of-bounds Read and CWE-787 Out-of-bounds Write conditions within the kernel-mode driver code, where insufficient input validation allows attackers to manipulate memory layout and potentially execute arbitrary code with kernel privileges.
The operational impact of this vulnerability is significant as it provides remote attackers with the capability to achieve privilege escalation from standard user context to SYSTEM level access on affected Windows systems. Attackers can exploit this issue by sending specially crafted network packets to a target system running the vulnerable driver, which could be achieved through various attack vectors including wireless networks, Ethernet connections, or even virtualized environments where bridge functionality is active. The vulnerability affects multiple Windows versions including Windows 10, Windows Server 2016, and Windows Server 2019, making it a widespread concern for enterprise environments that utilize network virtualization technologies.
From an attack perspective, this vulnerability aligns with ATT&CK technique T1059 Command and Scripting Interpreter and T1068 Exploitation for Privilege Escalation, as successful exploitation would allow attackers to execute code with the highest system privileges. The attack surface is particularly concerning in virtualized environments where multiple VMs share the same physical network infrastructure through bridging mechanisms, as a single compromised guest VM could potentially affect the host system or other VMs on the same network bridge. Organizations using Windows Server environments with network virtualization features such as Hyper-V or System Center Virtual Machine Manager are at heightened risk due to the prevalence of this bridging functionality.
Mitigation strategies should focus on immediate patch deployment through Microsoft's regular security updates, which address the underlying memory handling issues in the network driver components. Network segmentation and firewall rules can provide temporary protection by restricting unnecessary network traffic between systems that utilize bridge functionality. Additionally, implementing network monitoring solutions that can detect anomalous Layer-2 frame patterns may help identify potential exploitation attempts. System administrators should also consider disabling unused bridging features on systems where they are not required, reducing the attack surface. The vulnerability demonstrates the critical importance of kernel-mode driver security and highlights how seemingly routine network functionality can present significant security risks when not properly validated against malicious inputs. Organizations must maintain robust patch management processes and conduct regular security assessments of their virtualization infrastructure to prevent exploitation of similar low-level driver vulnerabilities that could compromise entire network environments.