CVE-2021-37089 in Huawei
Summary
by MITRE • 12/07/2021
There is a Incomplete Cleanup vulnerability in Huawei Smartphone.Successful exploitation of this vulnerability may lead to kernel restart.
If you want to get best quality of vulnerability data, you may have to visit VulDB.
Analysis
by VulDB Data Team • 12/10/2021
The vulnerability identified as CVE-2021-37089 represents an incomplete cleanup issue within Huawei smartphone devices that poses significant risks to system stability and security. This type of vulnerability typically occurs when software components fail to properly terminate or reset their operational state following specific processes or error conditions. The flaw manifests in the kernel level of Huawei smartphones, indicating a critical depth of impact that affects the core operating system functionality. Such vulnerabilities fall under the broader category of incomplete cleanup issues that are classified as CWE-459, which specifically addresses incomplete cleanup problems in software systems. The kernel restart consequence suggests that the vulnerability creates a condition where the device's fundamental operating system components are forced to reboot, potentially leading to service disruption and data loss.
The technical implementation of this vulnerability likely involves improper resource management or state handling within the smartphone's kernel modules or system drivers. When certain conditions are met during normal operation or error handling, the system fails to properly clean up allocated resources or reset operational states, leading to cascading failures that ultimately trigger a kernel restart. This behavior aligns with common patterns found in kernel-level vulnerabilities where memory management, process handling, or interrupt processing fails to properly account for all possible execution paths. The exploitation of this vulnerability requires specific conditions to be met, suggesting that it may be triggered through particular system calls, input sequences, or environmental factors that cause the cleanup routines to fail. The fact that this affects Huawei smartphones indicates a potential device-specific implementation issue within the Android-based operating system modifications that Huawei has implemented.
The operational impact of CVE-2021-37089 extends beyond simple system instability to potentially compromise user experience and device reliability. Kernel restarts can occur unexpectedly, leading to sudden device shutdowns or reboots that disrupt ongoing communications, applications, or data processing tasks. This vulnerability creates an attack surface that could be exploited by malicious actors to cause denial of service conditions or potentially gain unauthorized access to the device's kernel level. The restart functionality provides an opportunity for attackers to perform persistent attacks or to mask other malicious activities by causing the system to reset and clear temporary evidence. From an ATT&CK framework perspective, this vulnerability could map to techniques involving system restarts or denial of service, potentially supporting lateral movement or privilege escalation activities. The instability introduced by this vulnerability may also make the device more susceptible to other exploits that rely on system instability or memory corruption conditions.
Mitigation strategies for CVE-2021-37089 should focus on both immediate firmware updates and long-term system hardening measures. Users should immediately install available security patches from Huawei that address this specific kernel-level cleanup issue, as the vulnerability represents a clear risk to system stability and security. Device manufacturers should implement comprehensive resource management protocols that ensure all allocated memory, process states, and system handles are properly cleaned up regardless of execution path or error conditions. The implementation of proper error handling and resource cleanup routines should follow established security practices and include thorough testing under various failure scenarios. Network administrators and security teams should monitor for potential exploitation attempts targeting this vulnerability, particularly in environments where Huawei devices are deployed. Additionally, system administrators should consider implementing monitoring solutions that can detect unexpected kernel restarts or system instability patterns that may indicate exploitation attempts. The vulnerability highlights the importance of maintaining up-to-date security patches and implementing robust system integrity checks to prevent exploitation of incomplete cleanup vulnerabilities that can lead to critical system failures.