CVE-2020-9142 in Huawei
Summary
by MITRE • 01/14/2021
There is a heap base buffer overflow vulnerability in some Huawei smartphone.Successful exploitation of this vulnerability can cause heap overflow and memory overwriting when the system incorrectly processes the update file.
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Analysis
by VulDB Data Team • 02/13/2021
The heap buffer overflow vulnerability identified as CVE-2020-9142 affects Huawei smartphones and represents a critical memory corruption flaw that arises during the processing of update files. This vulnerability resides within the system's handling of firmware update mechanisms, where improper input validation leads to unauthorized memory access patterns. The flaw manifests when the device attempts to process malformed or specially crafted update files, creating conditions where heap-based memory regions exceed their allocated boundaries. Such memory corruption incidents typically occur in the context of firmware update services that manage system software installations and modifications. The vulnerability's classification aligns with CWE-121, which describes heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent memory locations. This type of vulnerability is particularly dangerous in mobile environments where update mechanisms are frequently accessed and can be manipulated through various attack vectors.
The technical exploitation of CVE-2020-9142 occurs when the affected Huawei smartphone receives an update file that contains maliciously crafted data structures. During the update process, the system's memory management routines fail to properly validate the size and content of incoming data, leading to buffer overflows in heap-allocated memory regions. The overflow conditions enable attackers to overwrite critical memory segments including function pointers, return addresses, or other control data structures that govern program execution flow. This memory corruption can result in arbitrary code execution or system instability, potentially allowing attackers to gain elevated privileges or compromise the device's integrity. The vulnerability's impact extends beyond simple memory corruption as it can be leveraged to bypass security mechanisms such as stack canaries, address space layout randomization, and other exploit mitigations that are standard in modern mobile operating systems. Attackers may utilize this flaw to execute malicious code within the context of system services responsible for firmware updates, potentially leading to complete device compromise.
The operational impact of CVE-2020-9142 presents significant risks to Huawei smartphone users and enterprise environments that rely on these devices for secure communications. Successful exploitation can lead to persistent backdoor access, data exfiltration, and complete system takeover without user knowledge or consent. The vulnerability's exploitation requires minimal user interaction, often only involving the installation of a malicious update file through compromised networks or physical access to the device. Organizations utilizing Huawei devices for business operations face potential supply chain risks, as attackers could distribute malicious update packages through legitimate distribution channels. The vulnerability's presence in firmware update mechanisms means that even devices that appear secure at runtime can become compromised during routine update processes, creating persistent threat vectors. This type of vulnerability aligns with ATT&CK technique T1068, which describes the use of local privilege escalation through exploitation of software vulnerabilities, and T1547, which covers the abuse of update mechanisms for persistence. The widespread deployment of affected Huawei smartphone models increases the potential attack surface significantly, as these devices may be used in environments with sensitive data or critical infrastructure access.
Mitigation strategies for CVE-2020-9142 should include immediate firmware updates from Huawei to address the heap buffer overflow vulnerability. Organizations should implement network monitoring to detect suspicious update file transfers and establish secure update verification processes using digital signatures and integrity checks. Device administrators should disable automatic update features until patches are verified and deployed. Security controls should include network segmentation to prevent unauthorized update file distribution and regular security assessments of update mechanisms. The vulnerability's resolution typically involves implementing proper bounds checking in heap allocation routines and strengthening input validation for update file processing. System administrators should maintain detailed logs of update activities and monitor for unusual update behavior that might indicate exploitation attempts. Additionally, implementing mobile device management solutions with update control capabilities can help prevent unauthorized firmware modifications. The vulnerability's remediation aligns with industry best practices for firmware security and represents a critical component of overall mobile security posture management. Organizations should also consider conducting vulnerability assessments to identify other potential heap-based buffer overflow conditions that might exist in similar update processing mechanisms across their mobile device fleets.