CVE-2023-0189: NVIDIA Virtual GPU RCE Vulnerability

CVE-2023-0189 Overview

CVE-2023-0189 is a vulnerability in the NVIDIA GPU Display Driver for Linux that affects the kernel mode layer handler. This flaw can enable attackers to achieve code execution, denial of service, escalation of privileges, information disclosure, and data tampering on affected systems. The vulnerability requires local access to exploit, making it particularly dangerous in multi-tenant environments or systems where attackers have already gained initial access.

Critical Impact

A local attacker with low privileges can exploit this vulnerability to execute arbitrary code, escalate privileges to root, cause system crashes, or access sensitive data on systems running vulnerable NVIDIA GPU drivers.

Affected Products

• NVIDIA Virtual GPU (vGPU) software versions prior to security patch
• Linux systems running vulnerable NVIDIA GPU Display Drivers
• Linux Kernel systems with NVIDIA driver integration

Discovery Timeline

• April 1, 2023 - CVE-2023-0189 published to NVD
• November 21, 2024 - Last updated in NVD database

Technical Details for CVE-2023-0189

Vulnerability Analysis

This vulnerability resides within the kernel mode layer handler component of the NVIDIA GPU Display Driver for Linux. The kernel mode layer is responsible for handling privileged operations between user-space applications and the GPU hardware. When this handler improperly processes certain requests, it creates an exploitable condition that can compromise system integrity.

The vulnerability is classified under CWE-822 (Untrusted Pointer Dereference), indicating that the driver fails to properly validate pointer references before use. This type of weakness allows an attacker to manipulate pointer values to reference arbitrary memory locations, potentially leading to execution of attacker-controlled code within the kernel context.

Successful exploitation requires local access and low privileges, but does not require user interaction. The impact is significant across confidentiality, integrity, and availability, as attackers can read sensitive memory, modify system state, and crash the system.

Root Cause

The root cause of CVE-2023-0189 is an untrusted pointer dereference (CWE-822) in the kernel mode layer handler. The driver fails to adequately validate pointer inputs received from user-space before dereferencing them in kernel context. This allows a local attacker to craft malicious requests containing controlled pointer values that, when processed by the vulnerable handler, result in arbitrary memory access or code execution within the kernel.

Attack Vector

The attack vector for this vulnerability is local, requiring an attacker to have existing access to the target system. The attacker would interact with the NVIDIA GPU driver through standard driver interfaces, such as ioctl calls or memory-mapped device operations. By sending specially crafted requests to the kernel mode layer handler, the attacker can trigger the vulnerability.

The exploitation flow typically involves:

1. Identifying a vulnerable NVIDIA driver installation on a Linux system
2. Crafting a malicious request containing pointer values that target sensitive memory regions
3. Submitting the request through the driver interface to the kernel mode layer handler
4. The handler dereferences the untrusted pointer, allowing the attacker to achieve code execution or information disclosure

Due to the sensitive nature of this kernel-level vulnerability, specific exploitation details are not disclosed. Refer to the NVIDIA Security Advisory for technical information.

Detection Methods for CVE-2023-0189

Indicators of Compromise

• Unusual ioctl system calls targeting NVIDIA driver device files (e.g., /dev/nvidia*)
• Kernel crash dumps or panics related to NVIDIA driver modules
• Unexpected privilege escalation events from processes interacting with GPU drivers
• Anomalous memory access patterns in kernel space associated with NVIDIA modules

Detection Strategies

• Monitor system logs for NVIDIA driver errors, crashes, or unexpected behavior in kernel mode
• Deploy endpoint detection solutions capable of monitoring kernel-level activity and driver interactions
• Implement file integrity monitoring on NVIDIA driver binaries and configuration files
• Use kernel auditing frameworks to track sensitive operations on NVIDIA device files

Monitoring Recommendations

• Enable detailed kernel logging for driver operations using dmesg monitoring
• Configure security information and event management (SIEM) rules to alert on NVIDIA driver anomalies
• Implement process behavior monitoring for applications with GPU access to detect exploitation attempts
• Regularly audit installed NVIDIA driver versions against known vulnerable releases

How to Mitigate CVE-2023-0189

Immediate Actions Required

• Inventory all systems running NVIDIA GPU Display Drivers on Linux to identify vulnerable installations
• Prioritize patching based on system criticality and exposure to untrusted local users
• Restrict local access to sensitive systems until patches can be applied
• Review and limit user accounts with access to NVIDIA device files

Patch Information

NVIDIA has released security updates to address CVE-2023-0189. Administrators should apply the latest driver versions as detailed in the NVIDIA Security Bulletin. Additionally, Linux distribution-specific advisories, such as Gentoo GLSA 202310-02, provide distribution-specific update packages.

Workarounds

• Restrict access to NVIDIA device files (/dev/nvidia*) using file system permissions to limit exposure
• Implement mandatory access control policies (SELinux, AppArmor) to restrict processes that can interact with GPU drivers
• Consider disabling unnecessary GPU functionality on systems that do not require GPU acceleration
• Monitor for and block suspicious driver interactions using kernel security modules

# Restrict access to NVIDIA device files as a temporary mitigation
chmod 660 /dev/nvidia*
chown root:video /dev/nvidia*
# Ensure only trusted users are members of the 'video' group