CVE-2015-9001 in Android
Summary
by MITRE
In TrustZone an information exposure vulnerability can potentially occur in all Android releases from CAF using the Linux kernel.
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Analysis
by VulDB Data Team • 12/24/2020
The vulnerability identified as CVE-2015-9001 represents a critical information exposure flaw within the TrustZone security architecture of Android devices. This vulnerability affects all Android releases from Code Aurora Forum (CAF) that utilize the Linux kernel, creating a widespread security concern across numerous mobile platforms. TrustZone technology, designed to provide a secure execution environment for sensitive operations, becomes compromised when this vulnerability is exploited, potentially allowing unauthorized access to confidential data stored within the secure world. The flaw manifests in the way information is handled and protected within the kernel-level security components, creating a pathway for attackers to extract sensitive data that should remain isolated from the normal execution environment. This vulnerability directly impacts the fundamental security model of Android devices that rely on TrustZone for hardware-level protection.
The technical implementation of this information exposure vulnerability stems from improper handling of memory management and data protection mechanisms within the Linux kernel components that interface with TrustZone. The flaw occurs when the kernel fails to properly isolate sensitive data between the normal world and the secure world of TrustZone, allowing information leakage through various kernel interfaces and system calls. Attackers can potentially exploit this weakness to gain access to cryptographic keys, authentication credentials, or other confidential information that should remain protected within the secure execution environment. The vulnerability is particularly concerning because it operates at the kernel level, making it difficult to detect and exploit without specialized knowledge of the underlying hardware and software architecture. This type of vulnerability aligns with CWE-200, which specifically addresses information exposure vulnerabilities in software systems.
The operational impact of CVE-2015-9001 extends beyond individual device compromise to potentially affect entire device fleets and user data integrity. When exploited, this vulnerability can enable attackers to extract sensitive information from devices, potentially leading to identity theft, financial fraud, or unauthorized access to corporate networks. The vulnerability's presence in all Android releases from CAF means that numerous devices across different manufacturers and models may be affected, creating a significant security risk for users and organizations relying on these platforms. The exploitation of this vulnerability can occur through various attack vectors including malicious applications, compromised update mechanisms, or network-based attacks that leverage the kernel-level exposure. This represents a fundamental breach in the security architecture that undermines the trust model of mobile devices and their ability to protect sensitive user data.
Mitigation strategies for CVE-2015-9001 require comprehensive system-level updates and patches from device manufacturers, as the vulnerability exists at the kernel level where standard application-level security measures prove insufficient. Organizations should implement immediate patch management protocols to ensure all affected devices receive the necessary security updates from their manufacturers. System administrators should also consider implementing additional monitoring and detection measures to identify potential exploitation attempts, particularly focusing on anomalous kernel behavior or unauthorized access patterns. The remediation process involves updating the Linux kernel components that interface with TrustZone, ensuring proper memory isolation mechanisms are in place, and validating that the secure world environment maintains proper separation from the normal world. Security professionals should also consider implementing network-based intrusion detection systems that can identify exploitation attempts targeting this specific vulnerability. This vulnerability demonstrates the importance of maintaining up-to-date security patches and highlights the critical nature of kernel-level security in mobile platforms, aligning with ATT&CK techniques that focus on privilege escalation and credential access through kernel-level exploits.