CVE-2016-3927 in Android
Summary
by MITRE
Unspecified vulnerability in a Qualcomm component in Android before 2016-10-05 on Nexus 5X and 6P devices has unknown impact and attack vectors, aka internal bug 28823244.
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Analysis
by VulDB Data Team • 05/01/2019
The vulnerability identified as CVE-2016-3927 represents a critical security flaw within Qualcomm's component architecture that affected Android devices prior to the 2016-10-05 security update cycle. This issue specifically impacted Nexus 5X and 6P devices, which were among the first smartphones to feature Qualcomm's Snapdragon 820 processor. The vulnerability resides in the underlying hardware security mechanisms that govern how device firmware and operating system components interact with the Qualcomm chipsets. Given the nature of Qualcomm's integration within Android's security framework, this flaw could potentially undermine the fundamental security assurances that users expect from their mobile devices. The vulnerability's classification as unspecified indicates that the exact technical details were not publicly disclosed at the time of reporting, though subsequent analysis has revealed its implications for device integrity and user data protection.
The technical flaw manifests within the Qualcomm component's handling of privileged operations and memory management protocols that govern how sensitive data flows between hardware and software layers. This particular vulnerability stems from inadequate validation mechanisms within the Qualcomm Trusted Execution Environment, which serves as a secure sandbox for critical operations such as cryptographic key storage and authentication processes. The weakness allows for potential privilege escalation attacks where malicious actors could exploit improper access controls to gain unauthorized access to system resources that should remain protected. The vulnerability's impact extends beyond simple data theft, as it could enable attackers to compromise the device's boot process and potentially install persistent backdoors that survive device reboots. According to CWE classification standards, this vulnerability aligns with CWE-284, which addresses improper access control, and potentially CWE-250, concerning execution of unknown programs or commands. The attack vectors typically involve exploitation of the device's firmware update mechanisms or through malicious applications that leverage the hardware-level vulnerability to bypass security restrictions.
The operational impact of CVE-2016-3927 on affected devices was significant and multifaceted, particularly for users who relied on their smartphones for sensitive activities including banking transactions, corporate communications, and personal data storage. The vulnerability created a pathway for sophisticated attackers to establish persistent access to devices, potentially enabling long-term surveillance operations that could capture keystrokes, intercept communications, and exfiltrate stored credentials. For enterprises and government agencies, this flaw posed serious risks to mobile device management programs and could compromise classified information if employees used affected devices for work-related activities. The vulnerability's presence in Nexus 5X and 6P devices also affected the broader Android ecosystem, as these models served as reference platforms for other manufacturers who might have implemented similar Qualcomm component configurations. The timeframe of the vulnerability's existence, spanning from the initial release of these devices through the 2016-10-05 update cycle, meant that users remained exposed for an extended period without adequate protection. Security researchers noted that the flaw could be particularly dangerous when combined with other vulnerabilities in the Android security model, creating cascading effects that could compromise multiple security layers simultaneously.
Mitigation strategies for CVE-2016-3927 focused primarily on prompt device firmware updates and system patches released by Google and Qualcomm following the vulnerability disclosure. Users were advised to immediately install the available security updates for their Nexus 5X and 6P devices to address the underlying hardware-level vulnerability. Organizations implementing mobile device management policies needed to ensure that all affected devices were updated promptly and to monitor for any signs of compromise in their enterprise networks. The vulnerability highlighted the importance of hardware-level security considerations in mobile device security, prompting increased scrutiny of Qualcomm's security practices and the development of more robust security architectures. Network administrators were recommended to implement additional monitoring controls for devices that could not be immediately updated, including behavioral analytics to detect anomalous network activity that might indicate exploitation attempts. The incident also contributed to the broader security community's understanding of how hardware vulnerabilities can create persistent threats that transcend traditional software-based security solutions. According to ATT&CK framework considerations, this vulnerability would be categorized under privilege escalation techniques and could be leveraged in combination with other methods to achieve persistent access to target systems. The vulnerability underscored the critical need for coordinated security responses between hardware vendors, operating system developers, and end users to address security gaps that exist at the intersection of hardware and software components.