CVE-2018-5856 in Android
Summary
by MITRE
In all android releases(Android for MSM, Firefox OS for MSM, QRD Android) from CAF using the linux kernel, due to a race condition, a Use After Free condition can occur in Audio.
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Analysis
by VulDB Data Team • 06/11/2023
The vulnerability identified as CVE-2018-5856 represents a critical security flaw affecting multiple Android variants including Android for MSM, Firefox OS for MSM, and QRD Android platforms. This issue stems from a race condition within the Linux kernel implementation that governs audio subsystem operations across these mobile platforms. The fundamental nature of this vulnerability lies in the improper handling of memory management during concurrent audio processing operations, creating a scenario where freed memory locations may still be accessed by subsequent operations.
The technical exploitation of this vulnerability manifests through a use-after-free condition that occurs within the audio processing subsystem of the Linux kernel. A race condition emerges when multiple threads or processes attempt to access the same audio buffer or memory structure simultaneously, with one thread freeing the memory while another continues to reference it. This timing issue creates a window where the audio subsystem can attempt to execute operations on memory that has already been deallocated, leading to unpredictable behavior and potential code execution. The vulnerability is particularly concerning as it operates at the kernel level, providing attackers with elevated privileges that could be leveraged to compromise the entire system.
The operational impact of CVE-2018-5856 extends beyond simple audio functionality degradation, presenting significant security risks to affected devices. When exploited, this vulnerability could enable attackers to execute arbitrary code with kernel-level privileges, potentially allowing complete system compromise. The race condition nature means that exploitation may not be consistent, requiring specific timing conditions to be met, but once successful, the consequences are severe. Mobile devices running affected Android versions become vulnerable to malicious audio applications or system-level attacks that could lead to data exfiltration, persistent backdoor installation, or complete device takeover. This vulnerability particularly affects devices that utilize Qualcomm Snapdragon processors and other MSM (Mobile Services Module) platforms.
Mitigation strategies for CVE-2018-5856 should prioritize immediate patch deployment from device manufacturers and system vendors, as this vulnerability represents a critical security risk requiring urgent attention. Organizations should implement comprehensive monitoring for suspicious audio-related system behavior and ensure all affected devices receive security updates promptly. The vulnerability aligns with CWE-416, which specifically addresses use-after-free conditions in software development, and demonstrates characteristics consistent with attack patterns documented in the MITRE ATT&CK framework under privilege escalation techniques. Device manufacturers should also consider implementing additional runtime protections and memory management hardening measures to reduce the attack surface. Security teams should monitor for exploitation attempts through network traffic analysis and system logs, particularly focusing on audio subsystem calls and memory allocation patterns that might indicate attempted exploitation of this race condition.