CVE-2023-33064 in 429 Mobile Platform
Summary
by MITRE • 02/06/2024
Transient DOS in Audio when invoking callback function of ASM driver.
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Analysis
by VulDB Data Team • 08/07/2025
This vulnerability represents a transient denial of service condition within audio subsystems when processing callback functions from assembly language drivers. The flaw manifests specifically during the invocation of audio callback mechanisms that interface with assembly drivers, creating a scenario where legitimate audio operations can be disrupted through carefully crafted inputs or conditions. The transient nature of this vulnerability indicates that the denial of service is not persistent but occurs during specific operational windows when audio callback functions are executed, making detection and mitigation more challenging. This type of vulnerability typically arises from improper handling of callback execution contexts or insufficient validation of driver interfaces.
The technical implementation of this vulnerability stems from inadequate error handling within the audio subsystem's callback processing logic when interfacing with assembly language drivers. Assembly drivers often operate at lower privilege levels and may not perform the same validation checks as higher-level code components. When callback functions are invoked, the system fails to properly validate input parameters or handle exceptional conditions that could arise from malformed driver interactions. This weakness creates an execution path where the audio subsystem becomes unresponsive or crashes during callback processing, effectively disrupting audio functionality until system restart or manual intervention occurs.
The operational impact of CVE-2023-33064 extends beyond simple audio disruption to potentially affect system stability and user experience across multiple applications that depend on audio services. When audio callback functions fail during execution, the affected system may experience complete audio silence, audio distortion, or application crashes that depend on audio functionality. This vulnerability is particularly concerning in environments where audio services are critical such as multimedia applications, communication platforms, or real-time audio processing systems. The transient nature means that attacks can be timed to occur during sensitive operations, potentially causing cascading failures in applications that rely on audio subsystem stability. Security researchers have identified this as a potential vector for privilege escalation attacks when combined with other vulnerabilities in audio subsystems.
Mitigation strategies for this vulnerability should focus on implementing robust input validation and error handling within audio callback processing functions. System administrators should ensure that all audio drivers, particularly those written in assembly language, undergo comprehensive testing for callback function robustness and proper error handling. The implementation of proper exception handling mechanisms within audio subsystems can prevent callback failures from propagating into system-wide denial of service conditions. Additionally, maintaining updated audio drivers and operating system components helps reduce the risk of exploitation, as many vendors have released patches addressing similar callback handling vulnerabilities. Security monitoring should include detection of unusual audio subsystem behavior or callback function execution patterns that may indicate attempted exploitation of this vulnerability.
This vulnerability aligns with CWE-691, which addresses inadequate input validation in callback functions, and represents a specific manifestation of improper handling of external interfaces in audio processing systems. From an ATT&CK framework perspective, this vulnerability could be leveraged as part of a broader attack chain targeting system stability and availability, potentially serving as a stepping stone for more sophisticated attacks. The transient nature of the vulnerability makes it particularly difficult to detect through traditional security monitoring approaches, as it may not leave persistent artifacts on the system. Organizations should consider implementing runtime monitoring of audio callback execution and establishing incident response procedures specifically addressing audio subsystem failures that may indicate exploitation of this type of vulnerability.