CVE-2018-11914 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 /systemrw/ which presents a potential security.
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Analysis
by VulDB Data Team • 06/11/2023
The vulnerability identified as CVE-2018-11914 represents a critical access control flaw affecting multiple Android variants including MSM, Firefox OS, and QRD Android platforms. This issue stems from improper privilege management within the Linux kernel implementation used by these mobile operating systems. The flaw allows unauthorized execution of device nodes and binaries from the /systemrw/ directory, which typically should be restricted to privileged operations only. The vulnerability exists across various Android for MSM, Firefox OS for MSM, and QRD Android releases, indicating a widespread impact within the mobile ecosystem. The root cause lies in insufficient validation of access permissions for system resources, creating an attack surface where malicious actors can exploit the relaxed security boundaries.
This access control weakness manifests through the improper handling of device node permissions and executable file access within the system filesystem hierarchy. The /systemrw/ directory, which should normally be restricted to system-level operations and privileged applications, becomes accessible to unauthorized processes due to inadequate permission checks. The vulnerability allows for potential privilege escalation scenarios where unprivileged code can execute binaries with elevated privileges, effectively bypassing the intended security boundaries. The Linux kernel implementation fails to properly enforce access controls for these specific filesystem locations, creating a persistent threat vector that can be exploited across the affected Android variants.
The operational impact of CVE-2018-11914 extends beyond simple unauthorized access, as it enables potential system compromise through privilege escalation attacks. Attackers can leverage this vulnerability to execute malicious code with elevated privileges, potentially leading to complete device takeover. The exploitation process typically involves gaining access to the /systemrw/ directory and executing unauthorized binaries, which can then be used to install persistent backdoors, modify system components, or extract sensitive data. This vulnerability directly impacts the principle of least privilege and can result in complete loss of device security, making it particularly dangerous in mobile environments where devices often contain personal and corporate information. The vulnerability affects the integrity and confidentiality of the entire system, as unauthorized code execution can occur without proper authentication or authorization checks.
Mitigation strategies for CVE-2018-11914 should focus on strengthening access control mechanisms within the Linux kernel implementation and enforcing proper privilege separation. Organizations should implement immediate patches and updates from their device manufacturers to address the underlying kernel vulnerabilities. System administrators should conduct thorough security audits to identify and restrict access to the /systemrw/ directory, ensuring that only authorized system processes can execute binaries from these locations. The implementation of mandatory access controls and enhanced privilege management should be prioritized, following established security frameworks such as those defined in the Common Weakness Enumeration standards. Additionally, regular monitoring of system logs for unauthorized access attempts and maintaining up-to-date security configurations can help detect and prevent exploitation attempts. The vulnerability aligns with ATT&CK techniques related to privilege escalation and persistence, making it essential to implement comprehensive security controls that address both immediate exploitation vectors and long-term system hardening measures.