CVE-2023-35670 in Android
Summary
by MITRE • 09/12/2023
In computeValuesFromData of FileUtils.java, there is a possible way to insert files to other apps' external private directories due to a path traversal error. 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 • 10/10/2023
The vulnerability identified as CVE-2023-35670 resides within the computeValuesFromData method of FileUtils.java, representing a critical path traversal flaw that enables unauthorized file insertion into other applications' external private directories. This vulnerability operates at the file system level and constitutes a significant security weakness that can be exploited without user interaction, making it particularly dangerous as it requires no additional privileges or user engagement to execute. The flaw stems from inadequate input validation and path sanitization within the file handling mechanism, allowing malicious actors to manipulate file paths and gain access to restricted application directories.
The technical implementation of this vulnerability demonstrates a classic path traversal attack vector where the computeValuesFromData method fails to properly validate or sanitize file paths before processing them. This weakness creates an opportunity for attackers to manipulate the file system navigation logic and redirect file operations to unintended destinations within the Android application sandbox. The vulnerability specifically targets external private directories which are typically protected areas where applications store their private data, making this a direct threat to application isolation and data security. The flaw aligns with CWE-22 Path Traversal and follows patterns commonly associated with privilege escalation vulnerabilities in mobile application environments.
The operational impact of CVE-2023-35670 extends beyond simple file manipulation as it enables local privilege escalation without requiring additional execution privileges, which represents a significant security compromise. Attackers can leverage this vulnerability to insert malicious files into other applications' private storage areas, potentially gaining access to sensitive data, modifying application behavior, or establishing persistent access points. The lack of user interaction requirement means that exploitation can occur automatically, making this vulnerability particularly concerning for mobile environments where applications run continuously and may be vulnerable to automated attacks. This vulnerability directly impacts the Android security model's application sandboxing mechanisms and can lead to data breaches, application compromise, and potential system-wide security degradation.
Mitigation strategies for CVE-2023-35670 should focus on implementing robust input validation and path sanitization within the FileUtils.java component, particularly in the computeValuesFromData method. Security measures should include strict validation of file paths to prevent traversal attacks, implementation of proper access controls for external private directories, and comprehensive sanitization of all user-supplied data before file operations are performed. Organizations should also consider applying the latest security patches and updates from affected vendors, implementing application whitelisting where possible, and conducting thorough code reviews to identify similar path traversal vulnerabilities in other components. This vulnerability demonstrates the importance of following secure coding practices and adheres to ATT&CK technique T1059.007 for Command and Scripting Interpreter and T1548.001 for Abuse of Functionality, as it enables privilege escalation through manipulation of application functions.