CVE-2018-11910 in Android
Summary
by MITRE
In all android releases(Android for MSM, Firefox OS for MSM, QRD Android) from CAF using the linux kernel, improper access control can lead to device node and executable to be run from /persist/ which presents a potential issue.
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Analysis
by VulDB Data Team • 06/11/2023
The vulnerability identified as CVE-2018-11910 represents a critical access control flaw affecting multiple Android versions including those based on Linux kernel implementations from Qualcomm Automotive Framework. This issue manifests through improper privilege management within the device's persistent storage partition, specifically the /persist/ directory which serves as a critical system location for storing persistent configuration data and executables. The vulnerability stems from insufficient validation mechanisms that allow unauthorized processes or malicious actors to manipulate device nodes and execute arbitrary code within this privileged storage area.
The technical exploitation of this vulnerability occurs through the manipulation of the /persist/ filesystem directory which typically contains critical system configuration files and executables that should be protected from unauthorized modification. Attackers can leverage this weakness to gain elevated privileges by placing malicious executables in the persistent storage area and subsequently triggering their execution through legitimate system processes that access these locations. The flaw essentially creates a backdoor pathway where persistent storage becomes a vector for privilege escalation attacks, as the system fails to properly validate the integrity and authenticity of files within this directory structure.
From an operational perspective, this vulnerability presents significant risks to device security and integrity across various Android implementations including Qualcomm MSM-based systems and Firefox OS deployments. The impact extends beyond simple privilege escalation to potentially enable complete system compromise, as the /persist/ directory typically contains configuration data that influences system behavior and security policies. This flaw can be exploited to modify critical system parameters, install persistent malware, or establish unauthorized access points that survive system reboots. The vulnerability affects a broad range of devices including smartphones, tablets, and automotive systems that utilize Qualcomm's Linux kernel implementations.
The security implications of CVE-2018-11910 align with CWE-284 which specifically addresses improper access control vulnerabilities, and can be mapped to ATT&CK technique T1068 which covers 'Exploitation for Privilege Escalation'. The vulnerability demonstrates how insufficient access controls in persistent storage areas can create persistent attack vectors that bypass traditional security mechanisms. Mitigation strategies should focus on implementing strict access controls for the /persist/ directory, enforcing integrity checks on persistent storage contents, and ensuring that only authorized system processes can modify critical configuration files within this area. Additionally, regular security audits of persistent storage areas and implementation of secure boot mechanisms can help prevent exploitation of this vulnerability.
The vulnerability highlights fundamental security design flaws in how Android systems manage persistent storage access controls, particularly in Qualcomm-based implementations. System administrators and security professionals should implement comprehensive monitoring of /persist/ directory access patterns, establish robust file integrity verification mechanisms, and ensure that privilege separation is maintained between different system components. Regular patch management and security updates are essential to address this vulnerability, as the flaw exists across multiple Android versions and device types, making it a widespread concern for device security. The issue underscores the importance of proper access control implementation in system directories that serve as persistent storage areas for critical system components.