CVE-2012-4225 in Unix Graphic Driver
Summary
by MITRE
NVIDIA UNIX graphics driver before 295.71 and before 304.32 allows local users to write to arbitrary physical memory locations and gain privileges by modifying the VGA window using /dev/nvidia0.
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Analysis
by VulDB Data Team • 12/20/2021
The vulnerability identified as CVE-2012-4225 represents a critical privilege escalation flaw within the NVIDIA UNIX graphics driver ecosystem. This issue affects versions prior to 295.71 and 304.32, creating a pathway for local attackers to execute arbitrary code with elevated privileges. The flaw stems from insufficient input validation and access control mechanisms within the driver's handling of VGA window modifications through the device file /dev/nvidia0. The vulnerability specifically targets the graphics driver's interaction with physical memory addressing, allowing malicious users to bypass normal memory protection boundaries and directly manipulate hardware resources.
The technical exploitation of this vulnerability leverages the direct hardware access capabilities of the NVIDIA graphics driver through the /dev/nvidia0 device interface. When a local user modifies VGA window parameters, the driver fails to properly validate the memory addresses being accessed, enabling arbitrary physical memory writes. This represents a fundamental breakdown in the driver's privilege separation model, where user-level processes can manipulate hardware resources that should remain protected from unauthorized access. The flaw operates at the kernel level, where graphics driver components interact directly with physical memory addresses rather than being properly mediated through secure kernel interfaces.
From an operational perspective, this vulnerability presents a severe risk to system security as it allows local users to escalate privileges without requiring additional attack vectors or exploitation of other vulnerabilities. The ability to write to arbitrary physical memory locations means that attackers can potentially modify critical system components including kernel memory, device drivers, or even the graphics driver itself. This type of vulnerability directly impacts the integrity and confidentiality of the operating system, as it enables attackers to gain root access or modify system behavior in ways that could persist across reboots or system restarts.
The vulnerability maps to CWE-787: "Out-of-bounds Write" and CWE-264: "Permissions, Privileges, and Access Controls" within the Common Weakness Enumeration framework. From the MITRE ATT&CK framework perspective, this vulnerability enables privilege escalation techniques categorized under T1068: "Exploitation for Privilege Escalation" and T1059: "Command and Scripting Interpreter" where attackers can leverage the elevated privileges to execute malicious code. The exploitation requires local system access but provides a direct path to system compromise that can be difficult to detect through traditional network-based security measures.
Mitigation strategies for CVE-2012-4225 primarily involve updating the NVIDIA graphics driver to versions 295.71 or 304.32 or later, which contain proper input validation and access control mechanisms. System administrators should also implement additional security measures including disabling unnecessary graphics driver interfaces, monitoring for unauthorized access to /dev/nvidia0, and ensuring that only trusted users have access to graphics driver interfaces. Network segmentation and privilege separation can help reduce the impact of successful exploitation, while regular security audits should verify that the graphics driver is properly configured and that access controls are appropriately enforced. The vulnerability highlights the importance of maintaining up-to-date graphics drivers and implementing comprehensive security monitoring for kernel-level access patterns.