CVE-2012-4220 in Android
Summary
by MITRE
diagchar_core.c in the Qualcomm Innovation Center (QuIC) Diagnostics (aka DIAG) kernel-mode driver for Android 2.3 through 4.2 allows attackers to execute arbitrary code or cause a denial of service (incorrect pointer dereference) via an application that uses crafted arguments in a local diagchar_ioctl call.
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Analysis
by VulDB Data Team • 08/11/2024
The vulnerability identified as CVE-2012-4220 resides within the Qualcomm Innovation Center QuIC Diagnostics kernel-mode driver component of Android operating systems versions 2.3 through 4.2. This driver implements the diagchar_core.c module which provides diagnostic services through the diagchar device interface. The flaw manifests as an incorrect pointer dereference that occurs when processing ioctl commands through the diagchar_ioctl function, creating a critical security weakness that can be exploited by local attackers with kernel-level privileges. The vulnerability stems from insufficient input validation and improper memory management within the driver's ioctl handling mechanism, allowing malicious applications to manipulate kernel memory through crafted arguments.
The technical implementation of this vulnerability involves a classic buffer overflow scenario where the diagnostic driver fails to properly validate or sanitize input parameters passed through the ioctl interface. When an application invokes diagchar_ioctl with specifically crafted arguments, the driver processes these inputs without adequate bounds checking, leading to an incorrect pointer dereference that can result in arbitrary code execution or system crashes. This type of flaw falls under CWE-125, which describes out-of-bounds read conditions, and represents a critical kernel-level vulnerability that bypasses normal Android security boundaries. The attack requires local execution privileges since the vulnerability exists within a kernel-mode driver that typically operates with elevated permissions.
From an operational perspective, this vulnerability presents significant risk to Android devices running affected versions as it enables local attackers to escalate privileges and execute arbitrary code with kernel-level access. The impact extends beyond simple privilege escalation since the affected driver provides diagnostic functionality that may be accessible to malicious applications or compromised user accounts. This vulnerability aligns with ATT&CK technique T1068 which describes 'Exploitation for Privilege Escalation' and T1059 which covers 'Command and Scripting Interpreter' as attackers could leverage this flaw to gain complete system control. The denial of service component of this vulnerability could also be exploited to create persistent system instability, potentially rendering devices unusable until rebooted.
Mitigation strategies for CVE-2012-4220 focus on immediate patching and system hardening measures. The primary solution involves updating to Android versions that contain fixes for this vulnerability, specifically Android 4.2.2 and later releases which address the incorrect pointer dereference in the diagchar driver. Organizations should implement proper input validation mechanisms and restrict access to the diagchar device interface to trusted applications only. Additionally, kernel-level security hardening measures such as enabling kernel address space layout randomization and implementing proper memory protection mechanisms can help reduce the exploitability of similar vulnerabilities. System administrators should also monitor for unauthorized access to diagnostic interfaces and implement proper application sandboxing to prevent malicious applications from leveraging this kernel vulnerability. The vulnerability demonstrates the critical importance of proper kernel driver security practices and highlights the need for comprehensive security testing of system-level components that operate with elevated privileges.