CVE-2020-9138 in Huawei
Summary
by MITRE • 01/14/2021
There is a heap-based buffer overflow vulnerability in some Huawei Smartphone, Successful exploit of this vulnerability can cause process exceptions during updating.
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Analysis
by VulDB Data Team • 02/13/2021
The heap-based buffer overflow vulnerability identified as CVE-2020-9138 affects Huawei smartphone devices and represents a critical security flaw within the device's update mechanism. This vulnerability resides in the memory management structure of the smartphone's firmware update process, specifically within the heap allocation and data handling components that govern how update packages are processed and installed on the device. The flaw manifests when the system attempts to write data beyond the allocated heap memory boundaries during the update procedure, creating a condition where maliciously crafted update files could trigger unauthorized memory access patterns.
The technical implementation of this vulnerability demonstrates a classic heap buffer overflow scenario where insufficient bounds checking occurs during the processing of update packages. When the smartphone's update service receives a malformed payload, the system's memory allocation routines fail to validate the size of incoming data against the allocated buffer space, allowing attackers to overwrite adjacent memory locations. This condition directly aligns with CWE-121 heap-based buffer overflow classification and represents a significant deviation from secure coding practices that mandate proper input validation and memory boundary checks.
The operational impact of successful exploitation of CVE-2020-9138 extends beyond simple process exceptions during updates, potentially enabling attackers to achieve arbitrary code execution within the device's update environment. During the update process, the vulnerable system may experience crashes, hangs, or unexpected behavior that could be leveraged to escalate privileges or bypass security controls. The attack surface is particularly concerning given that update processes typically run with elevated privileges and system-level access, making this vulnerability a prime target for malicious actors seeking to compromise device integrity. This scenario directly maps to ATT&CK technique T1059.001 for command and scripting interpreter execution and T1068 for exploit for privilege escalation.
Mitigation strategies for this vulnerability should focus on immediate firmware updates from Huawei to address the heap memory handling flaw, combined with network-level monitoring to detect suspicious update traffic patterns. Device security should include runtime protection mechanisms such as heap memory corruption detection and stack canaries to prevent exploitation attempts. Organizations should implement strict update validation procedures and maintain comprehensive device inventory tracking to ensure all affected Huawei smartphones receive the necessary security patches. Additionally, the vulnerability highlights the importance of secure firmware update protocols and the necessity for robust input validation in mobile operating system components, particularly those handling system-level operations and administrative functions. The security community should consider this vulnerability as part of broader mobile security assessments focusing on update mechanism integrity and memory safety practices across mobile device manufacturers.