CVE-2017-8254 in Android
Summary
by MITRE
In all Qualcomm products with Android releases from CAF using the Linux kernel, an audio client pointer is dereferenced before being checked if it is valid.
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Analysis
by VulDB Data Team • 11/09/2019
The vulnerability identified as CVE-2017-8254 represents a critical software flaw within Qualcomm's Android-based products that utilize the Linux kernel. This issue manifests in the audio subsystem where an audio client pointer undergoes dereferencing operations before proper validation occurs. The flaw exists in the Linux kernel implementation used by Qualcomm's Android platforms, affecting all devices running Android versions through the Code Aurora Forum (CAF) framework. The root cause stems from inadequate input validation mechanisms within the audio client management code, creating a scenario where memory access occurs without proper null pointer checks.
This vulnerability falls under the category of improper validation of pointers or references, which aligns with CWE-476, specifically the weakness of null pointer dereference. The technical implementation flaw occurs when the system attempts to access audio client data structures without first verifying that the pointer reference is valid and properly initialized. The audio client pointer in question likely represents a handle or reference to an audio session or stream that has not been properly validated before memory operations are performed. This type of vulnerability can lead to unpredictable behavior including system crashes, memory corruption, or potentially more severe consequences depending on the execution context and privileges involved.
The operational impact of CVE-2017-8254 extends across all Qualcomm-powered Android devices that utilize the Linux kernel implementation, potentially affecting millions of users globally. When exploited, this vulnerability could result in denial of service conditions where audio functionality becomes unavailable or the entire system may crash. In certain scenarios, the improper pointer dereference could lead to memory corruption that might be exploitable for privilege escalation or arbitrary code execution. The vulnerability affects devices across multiple device categories including smartphones, tablets, and other mobile platforms that rely on Qualcomm's audio processing capabilities. Attackers could potentially leverage this flaw to disrupt audio services or gain unauthorized access to system resources, particularly in environments where audio processing is critical for device operation.
Mitigation strategies for CVE-2017-8254 should focus on implementing proper pointer validation mechanisms within the audio subsystem. System administrators and device manufacturers should ensure that all audio client pointers are validated before any dereferencing operations occur. This includes implementing comprehensive input validation checks and proper null pointer verification before accessing audio session data structures. The recommended approach involves updating to patched kernel versions provided by Qualcomm that address this specific vulnerability. Additionally, implementing runtime protections such as stack canaries, pointer integrity checks, and memory access monitoring can help detect and prevent exploitation attempts. Organizations should also consider applying security patches promptly and maintaining updated firmware versions to protect against this and similar vulnerabilities. The ATT&CK framework categorizes this type of vulnerability under privilege escalation and denial of service techniques, emphasizing the need for robust input validation and memory safety mechanisms in kernel-level implementations.