CVE-2023-39403 in EMUI
Summary
by MITRE • 08/13/2023
Parameter verification vulnerability in the installd module. Successful exploitation of this vulnerability may cause sandbox files to be read and written without authorization.
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Analysis
by VulDB Data Team • 10/10/2024
The CVE-2023-39403 vulnerability represents a critical parameter verification flaw within the installd module of Android systems, specifically targeting the sandboxed file access mechanisms that govern application installation processes. This vulnerability resides in the core system component responsible for managing application installation and uninstallation operations, making it a prime target for adversaries seeking to escalate privileges or access sensitive system resources. The issue manifests when the installd module fails to properly validate input parameters during file operations, creating a pathway for unauthorized access to sandboxed environments where applications store their data and configuration files.
The technical nature of this vulnerability aligns with CWE-20, which describes improper input validation, and specifically relates to insufficient parameter validation within system-level processes. When applications are installed or updated, the installd module handles various file operations including reading and writing within designated sandbox boundaries. However, due to inadequate parameter verification, malicious actors can manipulate input parameters to bypass normal access controls and gain unauthorized read and write permissions to sandbox files that should be restricted to specific applications or system processes. This flaw essentially allows for privilege escalation through manipulation of the installation process itself, as the module does not properly sanitize or validate the parameters it receives from external sources.
The operational impact of CVE-2023-39403 extends beyond simple unauthorized file access, creating potential vectors for broader system compromise and data exfiltration. Attackers could exploit this vulnerability to read sensitive application data, modify installation files, or even inject malicious code into the installation process itself. The sandbox environment that normally protects user data and system integrity becomes compromised, allowing for persistent access to application-specific files that may contain personal information, credentials, or other sensitive data. This vulnerability particularly affects Android versions where the installd module operates with elevated privileges, enabling attackers to manipulate the installation of malicious applications or modify legitimate applications to include backdoors or other malicious functionality.
Mitigation strategies for CVE-2023-39403 should prioritize immediate system updates from device manufacturers and Google, as this vulnerability requires core system-level patches to address the underlying parameter validation flaws. Organizations and users should implement comprehensive monitoring of installation processes and file access patterns to detect anomalous behavior that might indicate exploitation attempts. The vulnerability's alignment with ATT&CK technique T1059.001 for command and script interpreter suggests that attackers may attempt to leverage this flaw to execute malicious code through modified installation packages or by manipulating system installation processes. Additionally, implementing strict application sandboxing policies and regularly auditing system permissions can help reduce the potential impact of such vulnerabilities. Security teams should also consider deploying endpoint detection and response solutions that can monitor for suspicious installd module behavior and parameter manipulation attempts, as these systems often serve as the first line of defense against such privilege escalation attacks.