CVE-2021-37027 in Huawei
Summary
by MITRE • 02/25/2022
There is a DoS vulnerability in smartphones. Successful exploitation of this vulnerability may affect service integrity.
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Analysis
by VulDB Data Team • 02/28/2022
The vulnerability identified as CVE-2021-37027 represents a denial of service weakness affecting mobile device systems that can compromise service integrity and availability. This vulnerability exists within smartphone operating systems and firmware components that handle critical system processes and resource management functions. The flaw manifests when the device encounters specific malformed input or processing conditions that cause the system to become unresponsive or crash entirely. Such conditions typically occur during normal operation when the device processes data streams or executes system calls that trigger the underlying flaw. The vulnerability impacts the fundamental reliability of mobile devices by creating scenarios where legitimate user activities can trigger system failures. The affected components often include kernel-level drivers, system service handlers, or memory management subsystems that process incoming data or commands from various sources within the device ecosystem.
The technical implementation of this vulnerability stems from inadequate input validation and error handling mechanisms within the smartphone's core system architecture. Attackers can exploit this weakness by crafting specific sequences of data or commands that, when processed by the affected system components, cause memory corruption or resource exhaustion conditions. The flaw typically operates through buffer overflow scenarios, integer underflow conditions, or improper state management during system operations. These conditions can be triggered through various attack vectors including malicious applications, network communications, or even legitimate system operations that exceed expected parameter limits. The vulnerability's exploitation does not require elevated privileges or specialized access conditions, making it particularly dangerous as it can be activated through common user interactions or automated attack scenarios. The underlying technical weakness often relates to improper bounds checking in memory allocation routines or insufficient validation of input parameters within system service interfaces.
The operational impact of CVE-2021-37027 extends beyond simple service disruption to encompass broader system reliability and user confidence issues. When exploited successfully, the vulnerability can cause complete device freeze, reboot cycles, or complete system failure that prevents normal device operation. Users may experience unexpected shutdowns, application crashes, or complete loss of device functionality during routine usage scenarios. The service integrity implications are significant as this vulnerability can affect critical communication functions, security services, and data processing capabilities that users depend upon. Organizations and individuals may face productivity losses, data access interruptions, and increased support costs when devices become compromised. The vulnerability's potential for widespread impact exists because modern smartphones contain numerous interconnected services and processes that can be affected by a single underlying flaw. System administrators and security teams must consider this vulnerability as a potential threat to enterprise device management and user productivity systems. The disruption can be particularly severe in environments where mobile devices serve critical infrastructure functions or where device availability directly impacts business operations.
Mitigation strategies for CVE-2021-37027 should focus on both immediate protective measures and long-term architectural improvements to device security. Device manufacturers should implement comprehensive input validation and bounds checking mechanisms within system components to prevent exploitation scenarios. Security patches and firmware updates should be deployed immediately to address the vulnerability, with priority given to devices that have been identified as affected through vulnerability scanning or threat intelligence feeds. Network administrators should monitor for exploitation attempts and implement network-based controls to detect and prevent malicious activity targeting this vulnerability. System hardening measures including memory protection mechanisms, stack canaries, and address space layout randomization should be enabled to make exploitation more difficult. Users should be educated about the risks and encouraged to maintain current system updates, avoid untrusted applications, and report unusual device behavior. The vulnerability aligns with CWE-129 which addresses improper validation of input ranges, and with ATT&CK techniques involving privilege escalation and denial of service operations. Organizations should also consider implementing device monitoring systems that can detect anomalous behavior patterns that may indicate exploitation attempts. Regular vulnerability assessments and penetration testing should be conducted to identify similar weaknesses in device architectures. The remediation process requires coordinated efforts between device manufacturers, operating system vendors, and security researchers to ensure comprehensive protection against this and related vulnerabilities.