CVE-2017-8238 in Android
Summary
by MITRE
In all Android releases from CAF using the Linux kernel, a buffer overflow vulnerability exists in a camera function.
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Analysis
by VulDB Data Team • 10/17/2019
The vulnerability identified as CVE-2017-8238 represents a critical buffer overflow flaw affecting Android devices that utilize Linux kernel components from Code Aurora Forum. This issue manifests within camera-related functions, specifically targeting the kernel-level camera driver implementations that are prevalent across numerous Android devices. The vulnerability stems from improper bounds checking within camera subsystem functions, creating an exploitable condition where malicious input can overwrite adjacent memory regions. Such buffer overflow conditions typically arise when programs fail to validate input lengths before copying data into fixed-size buffers, leading to potential memory corruption and arbitrary code execution.
The technical nature of this vulnerability places it squarely within CWE-121, which encompasses buffer overflow conditions that occur when insufficient bounds checking allows data to be written beyond the allocated buffer boundaries. This flaw specifically impacts the camera subsystem's ability to process image data or configuration parameters, where input validation fails to properly constrain data lengths. Attackers can exploit this vulnerability by crafting malicious camera commands or image data that triggers the buffer overflow during kernel processing, potentially enabling privilege escalation or complete system compromise. The Linux kernel's camera driver architecture, which handles image capture and processing operations, becomes the attack surface where this memory corruption occurs.
Operationally, the impact of CVE-2017-8238 extends beyond simple privilege escalation to encompass potential full system compromise and data exfiltration capabilities. The vulnerability affects all Android releases utilizing CAF Linux kernel components, creating a widespread exposure across numerous device manufacturers including those using Qualcomm Snapdragon processors. This exposure is particularly concerning given the camera subsystem's frequent interaction with user applications and system services, providing multiple attack vectors for exploitation. The vulnerability's kernel-level nature means that successful exploitation can bypass standard Android security controls, potentially allowing attackers to execute arbitrary code with kernel privileges, access sensitive device data, or modify critical system components.
Mitigation strategies for CVE-2017-8238 require immediate patch deployment from device manufacturers and system administrators, as the vulnerability represents a high-severity threat requiring urgent remediation. The primary defense involves applying kernel-level patches that implement proper input validation and bounds checking within camera driver functions, preventing the buffer overflow condition from occurring. Organizations should also implement runtime monitoring to detect potential exploitation attempts and maintain comprehensive backup and recovery procedures for affected systems. Additionally, device manufacturers should conduct thorough security testing of camera subsystems and implement secure coding practices to prevent similar vulnerabilities. The remediation process should include verification that all camera-related kernel modules have been properly updated and that no legacy camera drivers remain in the system that could potentially expose the device to continued risk. This vulnerability demonstrates the critical importance of secure kernel development practices and the need for continuous security assessment of device drivers in mobile operating systems.