NVIDIA GPU Display Driver for Windows contains a vulnerability in the kernel mode layer (nvlddmkm.sys) handler for DxgkDdiEscape, where an unprivileged regular user can cause exposure of sensitive information to an actor that is not explicitly authorized to have access to that information, which may lead to limited information disclosure.
NVIDIA GPU Display Driver for Windows is vulnerable to a sensitive information disclosure flaw. An unprivileged user can exploit a vulnerability in the DxgkDdiEscape handler within nvlddmkm.sys to leak potentially confidential data, potentially leading to further compromise. This vulnerability could be leveraged to gain insights into system configuration or other sensitive information, increasing the risk of a more severe attack.
Step 1: Trigger Preparation: An unprivileged user prepares a malicious request to the DxgkDdiEscape function within the NVIDIA GPU driver (nvlddmkm.sys). This request will contain crafted input parameters designed to exploit the vulnerability.
Step 2: Request Submission: The crafted request is submitted to the NVIDIA GPU driver through the appropriate Windows API calls, likely related to Direct3D or other graphics-related interfaces.
Step 3: Driver Processing: The DxgkDdiEscape handler within nvlddmkm.sys receives and processes the malicious request. Due to the lack of proper input validation, the driver interprets the crafted input in an unintended way.
Step 4: Information Leakage: The driver, as a result of the flawed processing, exposes sensitive information. This information is then returned to the attacker, potentially through a memory dump, a specific return value, or other means.
Step 5: Data Extraction: The attacker receives the leaked information and analyzes it to gain insights into the system's configuration, internal state, or other sensitive data.
The vulnerability lies within the nvlddmkm.sys driver's handling of the DxgkDdiEscape function. Specifically, the driver fails to properly validate or sanitize input parameters passed through the DxgkDdiEscape interface. This lack of input validation allows an attacker to craft a malicious request that triggers the driver to expose sensitive information. The root cause is likely a missing or inadequate check on the size or content of data being passed to the driver, leading to information leakage. This could manifest as the driver returning data it shouldn't, or providing information about the system's internal state. The exact nature of the leaked information depends on the specific implementation flaw, but could include details about the GPU's memory layout, driver configuration, or other sensitive internal data.