CVE-2012-4016 in ATOK
Summary
by MITRE
The ATOK application before 1.0.4 for Android allows remote attackers to read the learning information file, and obtain sensitive input-string information, via a crafted application.
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Analysis
by VulDB Data Team • 02/22/2019
The CVE-2012-4016 vulnerability affects the ATOK application for Android versions prior to 1.0.4, representing a significant security flaw in input method editor software that processes sensitive user data. This vulnerability resides in the application's improper handling of file permissions and access controls, specifically within the learning information file that stores user input patterns and behavioral data. The flaw enables remote attackers to exploit the application's weak security model through a crafted malicious application, bypassing normal access restrictions that should protect sensitive user input history.
The technical implementation of this vulnerability stems from inadequate file system permissions and missing security checks within the ATOK application's data handling mechanisms. The learning information file contains valuable data about user typing patterns, frequently used phrases, and input behaviors that could be leveraged for predictive analysis and behavioral profiling. Attackers can exploit this weakness by creating a malicious application that attempts to access the protected learning file through improper file system access methods. This represents a classic case of insufficient access control and privilege escalation, aligning with CWE-284 which addresses improper access control vulnerabilities.
The operational impact of this vulnerability extends beyond simple data exposure, as the learning information file contains sensitive user input patterns that could be used for identity impersonation, social engineering attacks, or targeted phishing campaigns. The information gathered from such files can provide attackers with detailed insights into user communication patterns, preferred terminology, and typing behaviors, making it particularly valuable for advanced persistent threat actors. This vulnerability directly impacts user privacy and could enable attackers to build comprehensive profiles of individual users, potentially leading to more sophisticated attacks targeting specific individuals or organizations.
Security professionals should consider this vulnerability in the context of the broader ATT&CK framework, particularly under the reconnaissance and credential access phases where adversaries gather information about targets. The vulnerability demonstrates how seemingly benign input method applications can become attack vectors for data exfiltration and user profiling. Mitigation strategies should focus on implementing proper file system permissions, utilizing Android's security model effectively, and ensuring that applications do not store sensitive data in accessible locations. The recommended approach involves updating to ATOK version 1.0.4 or later, implementing proper access control mechanisms, and conducting regular security audits of mobile applications that handle user input data. Additionally, organizations should consider network monitoring for suspicious file access patterns and implement mobile device management policies that restrict application permissions and data access.