CVE-2016-10408 in Snapdragon Mobile
Summary
by MITRE • 11/26/2024
QSEE will randomly experience a fatal error during execution due to speculative instruction fetches from device memory. Device memory is not valid executable memory.
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Analysis
by VulDB Data Team • 01/10/2025
The vulnerability identified as CVE-2016-10408 affects the Qualcomm Secure Execution Environment (QSEE) component, which represents a critical security mechanism within Qualcomm-based mobile devices. This flaw resides in the processor's speculative execution capabilities and specifically targets how the system handles memory access during instruction fetching. The QSEE operates as a trusted execution environment that isolates sensitive operations and data from the main operating system, making its integrity crucial for overall device security. When the processor engages in speculative instruction fetches, it attempts to predict and prefetch instructions that may be needed in the near future to improve performance.
The technical root cause of this vulnerability stems from improper validation of memory regions during speculative execution phases. The system performs instruction fetches from device memory locations that are not marked as valid executable memory regions. This creates a scenario where the processor may attempt to execute code from memory areas that should not contain executable instructions, leading to unpredictable behavior and potential system crashes. The vulnerability manifests as random fatal errors during normal execution, making it particularly challenging to detect and reproduce consistently. This type of flaw falls under the category of speculative execution side-channel vulnerabilities, which are increasingly common in modern processors due to their complex out-of-order execution mechanisms.
The operational impact of this vulnerability extends beyond simple system instability, as it can potentially enable attackers to exploit the system's speculative execution behavior for more advanced attacks. When the QSEE experiences fatal errors due to invalid memory fetches, it may lead to complete system crashes or unexpected behavior that could be leveraged to bypass security protections. The random nature of these errors makes them particularly dangerous because they can occur at any time during normal operation, potentially during critical security-sensitive operations. This vulnerability directly impacts the integrity of the trusted execution environment, which could compromise the security of encrypted data, authentication mechanisms, and other sensitive operations that rely on the QSEE for protection. The flaw aligns with CWE-119 which addresses improper access to memory locations, and represents a specific case of speculative execution vulnerabilities that can be exploited to cause system instability or potentially enable privilege escalation.
Mitigation strategies for this vulnerability require a multi-layered approach focusing on both firmware updates and system-level protections. Device manufacturers must implement comprehensive firmware patches that address the specific memory validation issues during speculative execution phases. These patches typically involve modifying how the processor handles memory access permissions during speculative fetches and ensuring that only properly validated executable memory regions are accessed. System administrators and security teams should also consider implementing additional runtime protections that monitor for abnormal memory access patterns and can detect when speculative execution is attempting to access invalid memory regions. The vulnerability demonstrates the importance of proper memory management in secure execution environments and highlights the need for comprehensive testing of speculative execution behaviors in security-critical components. Organizations should also implement monitoring solutions that can detect system instability patterns that may indicate exploitation attempts, as these vulnerabilities often serve as stepping stones for more sophisticated attacks targeting the underlying secure execution framework.