CVE-2018-11965 in Android
Summary
by MITRE
In all android releases(Android for MSM, Firefox OS for MSM, QRD Android) from CAF using the linux kernel, Anyone can execute proptrigger.sh which will lead to change in properties.
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Analysis
by VulDB Data Team • 04/22/2020
The vulnerability identified as CVE-2018-11965 represents a critical privilege escalation flaw affecting multiple Android variants including MSM, Firefox OS, and QRD Android platforms. This issue stems from improper access controls within the linux kernel implementation used by these mobile operating systems, creating a pathway for unauthorized users to manipulate system properties through a specifically crafted script execution. The vulnerability resides in the Android system's handling of property triggers, which are mechanisms designed to modify system parameters based on specific conditions or events.
The technical flaw manifests when the proptrigger.sh script becomes executable by unauthorized parties, allowing them to modify system properties without proper authentication or authorization. This script execution capability bypasses normal security boundaries and creates a persistent vector for privilege escalation attacks. The underlying issue demonstrates poor privilege separation within the kernel implementation, where file permissions and access controls fail to properly restrict who can execute property modification scripts. This vulnerability directly maps to CWE-276 which describes inadequate permissions for critical resources, and represents a classic example of insecure direct object reference in mobile operating system contexts.
The operational impact of this vulnerability is significant as it provides attackers with the ability to modify critical system properties that could alter device behavior, disable security features, or establish persistent backdoors. An attacker with local access could leverage this vulnerability to escalate privileges, modify system configurations, or potentially gain root access to the device. The implications extend beyond simple property manipulation as system properties often control security policies, network configurations, and other critical device functions. This vulnerability creates a persistent threat vector that could be exploited by malware or malicious applications that gain local execution privileges.
Mitigation strategies for CVE-2018-11965 should focus on implementing proper access controls and privilege separation mechanisms within the android kernel implementation. System administrators and device manufacturers should ensure that proptrigger.sh and similar scripts are properly secured with restrictive permissions and that only authorized processes can execute them. The fix typically involves modifying kernel-level access controls to prevent unauthorized execution of property modification scripts, implementing proper user and group permissions, and ensuring that system properties cannot be modified without appropriate authentication. This vulnerability also highlights the importance of following secure coding practices and proper privilege management as outlined in the ATT&CK framework under privilege escalation techniques, specifically targeting the use of system scripts and property manipulation as attack vectors. Organizations should also implement regular security audits and ensure proper patch management to address similar vulnerabilities in their mobile device management systems.