CVE-2017-8273 in Android
Summary
by MITRE
In all Qualcomm products with Android release from CAF using the Linux kernel, while processing fastboot boot command when verified boot feature is disabled, with length greater than boot image buffer, a buffer overflow can occur.
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Analysis
by VulDB Data Team • 11/06/2019
The vulnerability identified as CVE-2017-8273 represents a critical buffer overflow condition affecting Qualcomm Snapdragon chipsets integrated into various Android devices. This flaw manifests within the Linux kernel implementation of fastboot functionality, specifically when the verified boot feature is disabled. The vulnerability stems from inadequate input validation during the processing of fastboot boot commands, creating a scenario where maliciously crafted boot images can exceed the designated buffer boundaries.
The technical execution of this vulnerability occurs through the manipulation of fastboot commands in devices where verified boot has been disabled. When a boot image with a length exceeding the allocated buffer space is processed, the system fails to properly validate the input size against the available buffer capacity. This mismatch allows attackers to write data beyond the intended memory boundaries, potentially leading to arbitrary code execution or system instability. The vulnerability is particularly concerning because it operates at a low system level within the kernel, making it difficult to detect and exploit without specialized knowledge.
From an operational perspective, this vulnerability affects all Qualcomm products utilizing Android versions from the Common Android Framework that incorporate the Linux kernel. The impact extends across multiple device categories including smartphones, tablets, and other mobile devices that rely on Qualcomm Snapdragon processors. Attackers can leverage this vulnerability to execute malicious code with kernel-level privileges, potentially compromising the entire device security posture. The vulnerability's exploitation requires physical access to the device or the ability to deliver malicious boot images through fastboot interfaces, making it a significant concern for both enterprise and consumer deployments.
The vulnerability maps to CWE-121, which describes heap-based buffer overflow conditions, and aligns with ATT&CK technique T1059.007 for command and scripting interpreter execution. Organizations should implement immediate mitigations including disabling fastboot interfaces when not required, enforcing verified boot features, and applying firmware updates from device manufacturers. Additionally, network segmentation and monitoring of fastboot interfaces can help detect potential exploitation attempts. The vulnerability underscores the importance of secure boot implementations and proper input validation within kernel-level components, highlighting gaps in traditional security models that may leave system-level interfaces exposed to sophisticated attacks.