CVE-2012-4222 in Android
Summary
by MITRE
drivers/gpu/msm/kgsl.c in the Qualcomm Innovation Center (QuIC) Graphics KGSL kernel-mode driver for Android 2.3 through 4.2 allows attackers to cause a denial of service (NULL pointer dereference) via an application that uses crafted arguments in a local kgsl_ioctl call.
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Analysis
by VulDB Data Team • 08/11/2024
The vulnerability identified as CVE-2012-4222 resides within the Qualcomm Innovation Center's Graphics Kernel Shared Library (KGSL) kernel-mode driver component that serves Android operating systems from version 2.3 through 4.2. This flaw represents a critical security weakness that manifests as a null pointer dereference condition, fundamentally compromising system stability and availability. The vulnerability specifically affects the kernel-mode graphics driver that manages GPU resources and executes graphics-related operations on Qualcomm-based Android devices, making it particularly dangerous as it operates at the most privileged system level.
The technical implementation of this vulnerability occurs through the kgsl_ioctl system call interface within the kgsl.c driver file, where improper input validation allows malicious applications to craft specific arguments that trigger a null pointer dereference. When an application invokes the kgsl_ioctl function with malformed parameters, the driver fails to properly validate the input arguments before attempting to access memory locations, resulting in a kernel panic or system crash. This type of vulnerability falls under CWE-476 which specifically addresses null pointer dereference conditions, and represents a classic example of insufficient input validation in kernel space code. The flaw demonstrates poor defensive programming practices where the driver assumes certain memory pointers will always contain valid data without proper null checks.
The operational impact of this vulnerability extends beyond simple system instability to encompass complete denial of service conditions that can render devices unusable. When exploited, the null pointer dereference causes the kernel to crash, leading to system-wide blackouts and requiring manual device reboot to restore functionality. This makes the vulnerability particularly attractive to attackers seeking to disrupt device availability, whether for malicious purposes or as part of broader exploitation campaigns. The local nature of the attack means that an unprivileged application can trigger this condition, making it especially concerning for mobile environments where applications have varying levels of trust. The vulnerability also aligns with ATT&CK technique T1499.004 which involves network denial of service attacks, though in this case it operates at the kernel level rather than network protocols.
Mitigation strategies for CVE-2012-4222 primarily involve immediate patching of affected Android versions through official security updates from device manufacturers and Google. System administrators should ensure all devices running Android 2.3 through 4.2 receive the relevant kernel updates that include proper input validation and null pointer checks in the kgsl driver implementation. Additionally, implementing kernel hardening measures such as stack canaries, kernel address space layout randomization, and enhanced input validation frameworks can provide additional protection layers. Device manufacturers should also consider implementing application sandboxing and privilege separation mechanisms to limit the potential impact of such kernel-level vulnerabilities. The vulnerability highlights the importance of comprehensive kernel security testing and validation, particularly for graphics drivers that operate with elevated privileges and manage critical hardware resources. Organizations should also maintain robust incident response procedures to quickly identify and contain exploitation attempts targeting such kernel-level weaknesses.