CVE-2020-9139 in Huawei
Summary
by MITRE • 01/14/2021
There is a improper input validation vulnerability in some Huawei Smartphone.Successful exploit of this vulnerability can cause memory access errors and denial of service.
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Analysis
by VulDB Data Team • 02/13/2021
The vulnerability identified as CVE-2020-9139 represents a critical improper input validation flaw affecting certain Huawei smartphone models. This weakness resides in the device's software processing mechanisms where insufficient validation of user-provided data leads to potential system instability. The vulnerability manifests when the affected smartphone receives malformed or unexpected input through various communication channels or application interfaces, creating a pathway for malicious actors to exploit the device's processing capabilities. The root cause aligns with CWE-20, which specifically addresses improper input validation as a fundamental software security weakness that allows attackers to manipulate system behavior through crafted inputs. The improper validation occurs at multiple layers within the smartphone's operating system and application frameworks, where the device fails to adequately sanitize or verify the integrity of incoming data before processing.
The technical exploitation of this vulnerability results in memory access errors that can cascade into complete system denial of service conditions. When malformed input reaches the vulnerable processing components, the device's memory management systems encounter unexpected data patterns that trigger segmentation faults or access violations. These memory errors typically occur within the kernel-level processes or critical system libraries that handle network communications, file operations, or user interface rendering. The denial of service impact extends beyond simple application crashes to potentially rendering the entire device unusable until manual reboot or system recovery procedures are initiated. The vulnerability affects Huawei smartphones running specific firmware versions where input validation routines have not been properly implemented or updated. Attackers can leverage this weakness through various vectors including SMS messages, email attachments, network packets, or crafted application data that bypasses normal security controls.
The operational impact of CVE-2020-9139 presents significant risks to end users and enterprise environments where Huawei smartphones are deployed. Organizations relying on these devices for business operations face potential productivity losses when devices become unresponsive or require frequent restarts due to the denial of service conditions. The vulnerability creates an attack surface that aligns with ATT&CK technique T1499.001, which covers network denial of service attacks through system resource exhaustion or memory corruption. Mobile device management teams must consider this vulnerability when implementing security policies for corporate smartphones, as it can be exploited remotely without requiring physical access to the device. The exploitation is particularly concerning given the widespread deployment of affected Huawei smartphones across various industries including finance, healthcare, and government sectors where device reliability and availability are paramount. Security analysts should monitor for potential exploitation attempts through network traffic analysis or mobile threat intelligence feeds.
Mitigation strategies for CVE-2020-9139 should prioritize immediate firmware updates from Huawei as the primary remediation approach. The vendor has released security patches addressing the input validation gaps in affected smartphone models, which should be deployed across all vulnerable devices without delay. Network administrators should implement monitoring solutions to detect potential exploitation attempts through unusual network traffic patterns or device behavior anomalies. Mobile security teams should consider implementing network segmentation and access controls to limit potential attack vectors that could lead to exploitation. Organizations should also establish incident response procedures specifically addressing mobile device denial of service scenarios, including backup communication methods and device recovery protocols. The vulnerability underscores the importance of regular security assessments and vulnerability management programs that can identify and remediate similar input validation weaknesses across mobile platforms. Security professionals should also consider implementing device monitoring tools that can detect memory access errors or system instability patterns that may indicate exploitation attempts. Regular security awareness training for end users regarding suspicious communications and potential attack vectors can further reduce the risk of successful exploitation through social engineering approaches.