CVE-2018-5861 in Android
Summary
by MITRE
In all android releases(Android for MSM, Firefox OS for MSM, QRD Android) from CAF using the linux kernel, existing checks in place on partition size are incomplete and can lead to heap overwrite vulnerabilities while loading a secure application from the boot loader.
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Analysis
by VulDB Data Team • 06/11/2023
The vulnerability identified as CVE-2018-5861 represents a critical heap overflow condition affecting multiple Android variants including MSM, Firefox OS, and QRD Android platforms. This flaw resides within the Linux kernel implementation used by these operating systems and specifically impacts the secure application loading process initiated by the boot loader. The vulnerability stems from insufficient validation mechanisms that fail to properly verify partition size constraints during the loading sequence of secure applications.
The technical nature of this vulnerability manifests as a heap overwrite condition that occurs when the system attempts to load secure applications during the boot process. The incomplete partition size checks create an environment where maliciously crafted partition data can trigger buffer overflow conditions within the heap memory management system. This allows for arbitrary code execution and potentially complete system compromise. The vulnerability is particularly concerning because it operates at the boot loader level where system security controls are most critical and where traditional runtime protections may not be fully operational.
From an operational perspective, this vulnerability creates significant risk for mobile devices and embedded systems running affected Android variants. The heap overwrite condition can be exploited by attackers who gain access to the device during the boot process or through manipulation of the secure application loading mechanism. The impact extends beyond simple privilege escalation as the vulnerability can potentially allow for complete system takeover, data exfiltration, and persistent backdoor installation. Organizations deploying these systems face heightened risk of supply chain compromises and targeted attacks against their mobile infrastructure.
The vulnerability aligns with CWE-121, heap-based buffer overflow, and demonstrates characteristics consistent with ATT&CK technique T1068, Exploitation for Privilege Escalation. The incomplete validation checks represent a classic security bypass scenario where insufficient input sanitization allows for memory corruption. Mitigation strategies should focus on implementing comprehensive partition size validation at the kernel level, strengthening the boot loader security mechanisms, and deploying runtime integrity checks. System administrators should prioritize patching affected kernels and implementing additional security monitoring around the boot process to detect anomalous secure application loading activities. The vulnerability highlights the importance of thorough security validation in low-level system components where memory management and privilege boundaries intersect.