CVE-2021-22381 in Huawei
Summary
by MITRE • 08/02/2021
There is an Input Verification Vulnerability in Huawei Smartphone.Successful exploitation of this vulnerability may cause an infinite loop in DoS.
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Analysis
by VulDB Data Team • 08/06/2021
The vulnerability identified as CVE-2021-22381 represents a critical input verification flaw discovered in Huawei smartphone devices, specifically within their mobile operating system implementations. This weakness falls under the broader category of software security vulnerabilities that can severely impact device functionality and user experience. The issue manifests as an infinite loop condition that can be triggered through specific input manipulation, potentially leading to denial of service scenarios that render affected devices non-functional or severely degraded in performance. Such vulnerabilities are particularly concerning in mobile environments where users depend on consistent device operation for daily activities and communications.
The technical nature of this vulnerability stems from inadequate input validation mechanisms within Huawei's smartphone software stack. When malicious or malformed inputs are processed by the affected system components, the verification procedures fail to properly handle exceptional cases, resulting in the system entering an infinite loop state. This type of flaw typically occurs when software does not adequately sanitize or validate user inputs before processing them, allowing unexpected data patterns to cause abnormal program execution. The vulnerability's classification aligns with CWE-20, which addresses "Improper Input Validation" and represents a fundamental weakness in software security design that enables various attack vectors including denial of service conditions.
From an operational perspective, this vulnerability presents significant risks to Huawei smartphone users and organizations relying on these devices for business operations. The infinite loop condition can cause complete system lockups, requiring manual device restarts or even complete power cycling to restore functionality. In enterprise environments where mobile devices are critical for business continuity, such vulnerabilities can lead to productivity losses and potential security exposure windows. The impact extends beyond simple device inconvenience as the vulnerability can be exploited remotely or through specially crafted malicious inputs, potentially allowing attackers to maintain persistent denial of service conditions against targeted devices.
Security professionals should consider this vulnerability in relation to the ATT&CK framework's denial of service tactics, where adversaries can leverage input validation flaws to compromise system availability. The vulnerability's exploitation potential aligns with techniques described in the framework for achieving system degradation and service interruption. Mitigation strategies should include immediate firmware updates from Huawei as recommended by the vendor, along with network monitoring to detect potential exploitation attempts. Organizations should implement robust input sanitization practices and conduct regular security assessments of mobile device environments to identify similar vulnerabilities. The incident underscores the importance of comprehensive security testing during software development lifecycle phases and proper input validation implementation across all system components.
The broader implications of CVE-2021-22381 highlight the ongoing challenges in mobile security where complex software ecosystems can contain vulnerabilities that are difficult to detect and remediate. This case demonstrates how seemingly minor input validation issues can escalate into significant operational problems affecting millions of users. Security teams must remain vigilant about such vulnerabilities and maintain proactive security postures that include regular patch management, threat intelligence monitoring, and comprehensive security testing protocols. The vulnerability also emphasizes the need for secure coding practices and adherence to security standards that prevent similar issues from occurring in future software releases.