CVE-2023-34166 in EMUI
Summary
by MITRE • 06/19/2023
Vulnerability of system restart triggered by abnormal callbacks passed to APIs.Successful exploitation of this vulnerability may cause the system to restart.
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Analysis
by VulDB Data Team • 01/07/2026
This vulnerability represents a critical system stability issue that arises from improper handling of callback functions within application programming interfaces. The flaw manifests when abnormal or malformed callback parameters are passed to system APIs, resulting in unexpected system restart behavior. Such vulnerabilities typically stem from insufficient input validation and error handling mechanisms within the callback processing pipeline, creating a potential attack surface where malicious actors can manipulate API calls to force system reboots. The vulnerability falls under the category of improper input validation and can be classified as a CWE-20 weakness related to improper input sanitization. From an operational perspective, this vulnerability presents a significant risk to system availability and reliability, as unauthorized parties could potentially exploit it to cause denial of service through repeated system restarts.
The technical implementation of this vulnerability involves the interaction between application layer components and system-level APIs that handle callback registration and execution. When an application passes abnormal callback parameters to an API, the system's internal callback management mechanism fails to properly validate or sanitize these inputs before processing them. This lack of proper validation allows malicious or malformed callback references to be executed, triggering system-level operations that result in forced restarts. The underlying mechanism often involves the system's callback execution engine attempting to process invalid references, leading to memory corruption or system state inconsistencies that ultimately cause the operating system to initiate a restart sequence. The vulnerability is particularly concerning because it operates at a level that bypasses typical user-space protections and can affect core system functions.
The operational impact of this vulnerability extends beyond simple system downtime, as it can be leveraged for more sophisticated attacks within the context of the ATT&CK framework's privilege escalation and denial of service tactics. An attacker could potentially use this vulnerability to repeatedly restart system services, making it difficult to maintain system availability and potentially masking other malicious activities. The restart capability also provides an opportunity for attackers to disrupt ongoing operations, force system reconfiguration, or create conditions favorable for other attack vectors. From a security perspective, this vulnerability demonstrates the importance of robust input validation and proper error handling in system APIs, particularly those that handle dynamic function pointers or callback mechanisms. Organizations may face significant operational disruptions and potential compliance issues if systems are vulnerable to such restart-triggering exploits.
Mitigation strategies for this vulnerability should focus on implementing comprehensive input validation and sanitization for all callback parameters passed to system APIs. System administrators should ensure that callback handling mechanisms include proper bounds checking, type validation, and error recovery procedures to prevent malformed inputs from triggering system restarts. Additionally, implementing proper access controls and monitoring for unusual restart patterns can help detect potential exploitation attempts. Regular system updates and patches should be applied to address known callback handling vulnerabilities, while security teams should monitor system logs for abnormal callback execution patterns. The vulnerability highlights the importance of following secure coding practices and adhering to standards such as those outlined in the CWE database, particularly regarding proper input validation and error handling. Organizations should also consider implementing intrusion detection systems that can identify suspicious API call patterns and callback parameter anomalies that may indicate exploitation attempts.