CVE-2017-7369 in Android
Summary
by MITRE
In all Android releases from CAF using the Linux kernel, an array index in an ALSA routine is not properly validating potentially leading to kernel stack corruption.
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Analysis
by VulDB Data Team • 12/27/2020
The vulnerability identified as CVE-2017-7369 represents a critical kernel-level flaw affecting Android devices that utilize the Linux kernel through the Code Aurora Forum. This issue resides within the Advanced Linux Sound Architecture ALSA subsystem where improper validation of array indices creates opportunities for malicious actors to exploit kernel memory corruption. The vulnerability affects all Android releases that incorporate the Linux kernel from CAF, making it widespread across numerous device models and manufacturers. The flaw specifically targets the kernel stack, which serves as the foundation for kernel operations and is critical for maintaining system stability and security.
The technical implementation of this vulnerability stems from inadequate bounds checking within ALSA routines that handle audio device operations. When processing audio data through kernel-level sound drivers, the system fails to properly validate array indices before accessing kernel memory locations. This validation gap allows attackers to craft malicious audio input that triggers buffer overflows or stack corruption, potentially enabling privilege escalation from user-space applications to kernel-level execution. The vulnerability operates at the kernel level where memory management and system integrity are paramount, making it particularly dangerous as it can bypass standard security mechanisms and access critical system resources.
The operational impact of CVE-2017-7369 extends beyond simple system instability, creating potential pathways for complete system compromise. An attacker exploiting this vulnerability could gain unauthorized access to kernel memory, potentially enabling code execution with the highest privileges available to the system. This type of vulnerability falls under the CWE-129 category of Improper Validation of Array Index, which is classified as a weakness that allows attackers to manipulate memory access patterns. The attack surface is particularly concerning given that audio processing is a fundamental system function that applications frequently utilize, making exploitation more likely. The vulnerability could enable attackers to install persistent malware, extract sensitive information, or completely compromise device functionality.
Mitigation strategies for this vulnerability require immediate patching of affected Android versions through official security updates from device manufacturers. System administrators should prioritize deployment of kernel updates that address the array validation issues within ALSA routines, particularly focusing on the Linux kernel versions that incorporate CAF components. The implementation of kernel memory protection mechanisms such as stack canaries and kernel address space layout randomization can provide additional defense-in-depth measures. Organizations should also consider implementing monitoring solutions that detect anomalous audio processing patterns that might indicate exploitation attempts. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques and kernel-mode exploitation, making it a critical target for defensive security teams to address through comprehensive patch management and system hardening procedures.