CVE-2023-39384 in EMUI
Summary
by MITRE • 08/13/2023
Vulnerability of incomplete permission verification in the input method module. Successful exploitation of this vulnerability may cause features to perform abnormally.
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Analysis
by VulDB Data Team • 09/08/2023
This vulnerability resides within the input method module of a system where insufficient permission verification mechanisms exist, creating a potential pathway for unauthorized access or manipulation of input processing functions. The flaw specifically targets the validation processes that should occur when users interact with input methods such as keyboard layouts, text prediction systems, or language switching capabilities. According to the CWE taxonomy, this represents a variant of incomplete input validation or permission verification, classified under CWE-284 which deals with improper access control. The vulnerability manifests when the system fails to properly authenticate or authorize user actions within the input method context, potentially allowing malicious actors to bypass normal security boundaries.
The technical implementation of this vulnerability stems from inadequate checks within the input method module's access control framework. When users interact with input methods, the system should verify that the requesting entity has appropriate permissions before executing any input processing functions. However, in this case, the verification process is incomplete or missing entirely, allowing unauthorized modifications to input handling behaviors. This could enable attackers to manipulate text input, change keyboard mappings, or alter language processing settings without proper authorization. The vulnerability operates at the application level where user input is processed, making it particularly dangerous as it can affect all applications that rely on the compromised input method service.
The operational impact of this vulnerability extends beyond simple functional disruption to potentially enable more severe security breaches. Attackers could exploit this weakness to inject malicious content through manipulated input methods, perform keystroke injection attacks, or establish persistent access through modified input processing routines. The abnormal behavior mentioned in the description could manifest as unexpected application crashes, data corruption, or unauthorized privilege escalation within the input method context. From an attack perspective, this vulnerability aligns with techniques described in the ATT&CK framework under T1056 which covers input injection methods, and potentially T1548 related to privilege escalation through access control manipulation. The vulnerability could be particularly dangerous in enterprise environments where input method services are shared across multiple users or applications.
Mitigation strategies should focus on implementing comprehensive permission verification mechanisms throughout the input method module. System administrators should ensure that all input method services enforce strict access controls and validate user permissions before executing any input processing functions. This includes implementing proper authentication checks for input method configuration changes, enforcing role-based access controls, and regularly auditing input method service permissions. Additionally, the system should implement logging mechanisms to detect unauthorized attempts to modify input method configurations. Security patches should address the underlying permission verification flaws by ensuring that all input method operations require proper authorization checks before execution. Organizations should also consider isolating input method services and implementing network segmentation to limit potential attack surfaces. Regular security assessments should verify that the input method module properly enforces access controls and that no unauthorized modifications can occur without proper authorization. The vulnerability highlights the importance of securing all system components, including seemingly benign services like input methods, as they can serve as entry points for broader system compromise.