CVE-2018-9406 in Android
Summary
by MITRE • 01/18/2025
In NlpService, there is a possible way to obtain location information due to a missing permission check. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
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Analysis
by VulDB Data Team • 02/01/2025
The vulnerability identified as CVE-2018-9406 resides within the NlpService component of Android operating systems, representing a critical security flaw that undermines the system's permission model. This issue manifests as a missing permission check that allows unauthorized access to location information, fundamentally compromising the integrity of the Android security framework. The vulnerability specifically affects the natural language processing service that handles various system-level interactions, creating an exploitable pathway for malicious actors to bypass normal access controls.
The technical implementation of this flaw involves the NlpService failing to properly validate permission levels when processing location-related requests. This missing validation occurs at the service level where location data should be restricted to applications with explicit location permissions. The vulnerability stems from improper access control mechanisms within the service architecture, where the system does not adequately verify whether requesting processes have legitimate authorization to access geolocation data. This oversight creates a scenario where any process running within the system can potentially extract location information without proper authorization, effectively undermining the principle of least privilege that forms the foundation of Android's security model.
The operational impact of CVE-2018-9406 extends beyond simple information disclosure, as it enables local privilege escalation without requiring additional execution privileges or user interaction. This means that an attacker with minimal system access can leverage this vulnerability to gain elevated privileges within the Android environment, potentially leading to complete system compromise. The absence of user interaction requirements makes this vulnerability particularly dangerous as it can be exploited automatically without the need for social engineering or user deception. The local escalation of privilege threat level is elevated because the attacker can manipulate system-level processes and potentially access sensitive data, system resources, and other applications that should normally be restricted.
From a cybersecurity perspective, this vulnerability aligns with CWE-284, which describes improper access control issues where systems fail to properly enforce access restrictions. The flaw represents a direct violation of Android's security model and creates opportunities for attackers to perform actions that should be restricted to system-level processes or applications with specific permissions. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically targeting the use of system services to gain elevated privileges. The vulnerability's classification as a local escalation of privilege means it can be exploited through legitimate system services, making it particularly challenging to detect and prevent through traditional network-based security measures.
Mitigation strategies for CVE-2018-9406 require immediate system updates and patches from device manufacturers, as the vulnerability exists at the operating system level within the NlpService component. Security professionals should implement comprehensive monitoring of system services and access patterns to detect potential exploitation attempts. The recommended approach includes applying the latest security patches, conducting thorough system audits to identify unauthorized processes, and implementing network segmentation to limit potential lateral movement. Additionally, organizations should review their application permission models and ensure that only authorized applications have access to location services, while maintaining strict access controls on system-level services that handle sensitive data processing.