CVE-2023-20670 in MT2715
Summary
by MITRE • 04/06/2023
In audio, there is a possible out of bounds write due to a missing bounds check. This could lead to local escalation of privilege with System execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS07648710; Issue ID: ALPS07648710.
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Analysis
by VulDB Data Team • 08/29/2025
This vulnerability resides within the audio subsystem of an Android-based operating system and represents a critical out-of-bounds write flaw that could enable local privilege escalation. The issue manifests when the system fails to perform proper bounds checking on audio data processing operations, allowing malicious code to write data beyond the allocated memory boundaries. The vulnerability is classified as a memory corruption issue that could potentially be exploited to gain system-level privileges, as it operates at a low level within the kernel space where audio processing occurs. The absence of bounds validation creates an opportunity for attackers to manipulate memory layout and execute arbitrary code with elevated privileges. This particular flaw affects the audio processing pipeline and demonstrates a fundamental failure in input validation that could be leveraged by malicious applications already present on the device.
The technical implementation of this vulnerability stems from insufficient validation of audio buffer sizes and data lengths during processing operations. When audio data is received and processed by the system, the code fails to verify that the incoming data fits within the expected memory boundaries before writing to memory locations. This missing bounds check creates a scenario where an attacker can craft malicious audio data that, when processed, causes the system to write beyond allocated memory regions. The vulnerability is particularly concerning because it requires system execution privileges for exploitation, indicating that it operates at a level where kernel-level components are involved in audio processing. The flaw is categorized under CWE-787 which specifically addresses out-of-bounds write vulnerabilities, and aligns with ATT&CK technique T1068 which covers local privilege escalation through kernel exploits. The patch ID ALPS07648710 indicates this was addressed within the Android Linux kernel's audio subsystem specifically.
The operational impact of this vulnerability extends beyond simple memory corruption, as it creates a pathway for full system compromise. An attacker with local access to a device could potentially exploit this vulnerability to execute code with system-level privileges, effectively bypassing normal security restrictions. The lack of user interaction requirement makes this particularly dangerous as it can be exploited automatically without requiring any user engagement or specific actions. This vulnerability could enable attackers to escalate privileges to root level, potentially allowing them to modify system files, install malicious applications, or extract sensitive data from the device. The audio subsystem is often accessed by multiple applications and system components, creating multiple potential entry points for exploitation. The vulnerability's location within system-level audio processing means that successful exploitation could affect all audio-related functionality while simultaneously providing a persistent backdoor for further attacks.
Mitigation strategies for this vulnerability should focus on immediate patch application and system hardening measures. The recommended approach involves deploying the official patch ALPS07648710 which addresses the bounds checking issue in the audio subsystem. Organizations should prioritize patch management processes to ensure all affected devices receive updates promptly, particularly in enterprise environments where multiple devices may be vulnerable. Additional protective measures include implementing runtime monitoring for suspicious memory access patterns and configuring proper access controls for audio processing components. System administrators should consider implementing application whitelisting policies that limit which applications can access audio processing APIs and monitor for unusual audio data processing patterns that might indicate exploitation attempts. The vulnerability's classification as a privilege escalation issue also necessitates regular security audits of audio subsystem access controls and privilege assignments to prevent unauthorized access to system-level resources. Network segmentation and endpoint detection and response solutions should be deployed to identify and contain potential exploitation attempts, as this vulnerability could serve as a stepping stone for more comprehensive attacks against the device or network infrastructure.