CVE-2024-0133: NVIDIA Container Toolkit File Creation Flaw

CVE-2024-0133 Overview

NVIDIA Container Toolkit version 1.16.1 or earlier contains a Time-of-Check Time-of-Use (TOCTOU) vulnerability in the default mode of operation. This security flaw allows a specially crafted container image to create empty files on the host file system, potentially leading to data tampering. The vulnerability specifically affects the standard operational mode and does not impact deployments where Container Device Interface (CDI) is utilized.

Critical Impact

Attackers can leverage malicious container images to create unauthorized empty files on the host file system, enabling potential data tampering scenarios in containerized environments running NVIDIA GPU workloads.

Affected Products

• NVIDIA Container Toolkit versions 1.16.1 and earlier
• NVIDIA GPU Operator (when using affected Container Toolkit versions)
• Linux Kernel-based systems running vulnerable NVIDIA Container Toolkit

Discovery Timeline

• 2024-09-26 - CVE-2024-0133 published to NVD
• 2024-10-02 - Last updated in NVD database

Technical Details for CVE-2024-0133

Vulnerability Analysis

This vulnerability is classified under CWE-367 (Time-of-Check Time-of-Use Race Condition), indicating a race condition flaw in how the NVIDIA Container Toolkit validates and processes container image resources. The vulnerability exists in the default operational mode of the toolkit, which is responsible for managing GPU access within containerized environments.

The attack requires network access and user interaction, with the complexity of exploitation rated as high. While the confidentiality impact is negligible, the vulnerability allows for limited integrity impact through unauthorized file creation on the host system. The scope is changed, meaning the vulnerable component (Container Toolkit) can affect resources beyond its security scope (the host file system).

Root Cause

The root cause is a Time-of-Check Time-of-Use (TOCTOU) race condition in the NVIDIA Container Toolkit's default mode of operation. This occurs when there is a gap between the security validation of a resource (time-of-check) and the actual use of that resource (time-of-use). During this window, an attacker can manipulate the state of the resource, bypassing the intended security controls. The vulnerability allows specially crafted container images to exploit this timing window to create empty files on the host file system.

Attack Vector

The attack vector is network-based and requires the following conditions:

1. The target system must be running NVIDIA Container Toolkit version 1.16.1 or earlier
2. The system must be operating in default mode (not using CDI)
3. An attacker must craft a malicious container image designed to exploit the TOCTOU race condition
4. User interaction is required to trigger the vulnerable code path

The exploitation mechanism involves a malicious container image that takes advantage of the race condition window between validation and use of container resources. When the container is instantiated, the attacker can manipulate the timing to create unauthorized empty files on the host file system, bypassing container isolation boundaries.

Detection Methods for CVE-2024-0133

Indicators of Compromise

• Unexpected empty files appearing on the host file system outside of designated container volumes
• Unusual file creation patterns in system directories that should be isolated from container access
• Container images from untrusted sources attempting to access host file system paths
• Anomalous timing patterns in container initialization that may indicate race condition exploitation

Detection Strategies

• Monitor host file system for unauthorized file creation events, particularly empty files in sensitive directories
• Implement container image scanning to detect potentially malicious images before deployment
• Enable audit logging for container runtime operations and correlate with host file system events
• Deploy runtime security monitoring to detect container escape attempts and unauthorized host access

Monitoring Recommendations

• Configure file integrity monitoring (FIM) on critical host directories to detect unauthorized modifications
• Implement container-aware security monitoring that tracks file system operations across container boundaries
• Establish baseline container behavior and alert on deviations that may indicate exploitation
• Monitor NVIDIA Container Toolkit logs for unusual error patterns or unexpected operations

How to Mitigate CVE-2024-0133

Immediate Actions Required

• Upgrade NVIDIA Container Toolkit to version 1.16.2 or later as recommended in the vendor advisory
• Consider switching to CDI (Container Device Interface) mode, which is not affected by this vulnerability
• Audit existing container images for potential malicious content before deployment
• Implement strict container image policies to only allow trusted, verified images

Patch Information

NVIDIA has released a security update addressing this vulnerability. Organizations should apply the patch by upgrading to NVIDIA Container Toolkit version 1.16.2 or later. Detailed patch information and installation instructions are available in the NVIDIA Security Advisory.

Workarounds

• Enable CDI (Container Device Interface) mode instead of the default operational mode, as CDI is not affected by this vulnerability
• Implement strict container image verification and only deploy containers from trusted registries
• Apply additional file system protections to restrict container access to host directories
• Deploy container runtime security solutions that can detect and block unauthorized file system operations

# Configuration example: Switch to CDI mode to mitigate vulnerability
# Edit the NVIDIA Container Toolkit configuration
# Verify CDI mode is enabled in your container runtime configuration
nvidia-ctk cdi generate --output=/etc/cdi/nvidia.yaml
# Ensure containers use CDI device specifications instead of default mode