CVE-2018-11956 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 mounting lead to device node and executable to be run from /dsp/ which presents a potential security issue.
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Analysis
by VulDB Data Team • 06/11/2023
This vulnerability affects multiple android platforms including MSM variants, Firefox OS for MSM, and QRD Android systems that utilize the linux kernel. The core issue stems from improper mounting procedures that allow device nodes and executable files to be mounted and executed from the /dsp/ directory, creating a significant security risk. The vulnerability represents a privilege escalation vector where malicious actors can potentially gain unauthorized access to system resources through this insecure mounting configuration.
The technical flaw manifests in the linux kernel's handling of device node mounting operations within the digital signal processor directory structure. When the system improperly mounts filesystems or device nodes in the /dsp/ location, it creates an environment where executable code can be placed and executed with elevated privileges. This misconfiguration allows for unauthorized code execution in a location that should typically be restricted and protected. The vulnerability is classified under CWE-276 which addresses improper privileges and permissions in system components.
From an operational perspective, this vulnerability presents a serious threat to device security as it enables potential attackers to execute malicious code with system-level privileges. The impact extends beyond simple privilege escalation to include potential data exfiltration, system compromise, and persistent backdoor establishment. Attackers can leverage this weakness to gain unauthorized access to sensitive system information and potentially establish footholds for further exploitation within the device ecosystem.
The security implications are particularly concerning given that this affects multiple android variants and is rooted in the underlying linux kernel implementation. This makes the vulnerability widespread across various device manufacturers and platforms that rely on common kernel components. The issue aligns with ATT&CK technique T1068 which covers local privilege escalation and T1059 which encompasses execution of malicious code through compromised system components.
Mitigation strategies should focus on implementing proper mounting procedures and access controls within the /dsp/ directory structure. System administrators should ensure that device nodes and executable files in this location are properly secured with appropriate permissions and that automatic mounting of potentially dangerous filesystems is disabled. Regular security audits should verify that mounting configurations follow secure practices and that no unauthorized code execution paths exist through the device node hierarchy. Additionally, implementing kernel-level protections and monitoring for suspicious mounting activities can help detect and prevent exploitation attempts. Organizations should also consider applying vendor-specific patches and updates as they become available to address the underlying kernel implementation issues that create this vulnerability.