CVE-2018-5854 in Android
Summary
by MITRE
In fastboot, a stack-based buffer overflow can occur in all Android releases(Android for MSM, Firefox OS for MSM, QRD Android) from CAF using the Linux kernel.
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Analysis
by VulDB Data Team • 02/19/2020
The vulnerability identified as CVE-2018-5854 represents a critical stack-based buffer overflow flaw within the fastboot component of Android systems. This issue affects multiple Android variants including Android for MSM, Firefox OS for MSM, and QRD Android, all of which utilize the Linux kernel framework. The vulnerability stems from improper input validation mechanisms within the fastboot bootloader interface, which serves as a critical entry point for device provisioning and firmware updates. Fastboot operates at a low level in the device boot process, making it a prime target for attackers seeking to compromise device integrity during the initial boot sequence. The flaw specifically manifests when the system processes certain commands or data structures that exceed allocated buffer boundaries, creating opportunities for arbitrary code execution and system compromise.
The technical implementation of this vulnerability involves a classic stack-based buffer overflow condition where attacker-controlled data is copied into a fixed-size buffer without adequate bounds checking. This allows an attacker to overwrite adjacent stack memory locations, potentially corrupting return addresses, function pointers, or other critical execution data. The Linux kernel's interaction with fastboot components creates a complex attack surface where malicious payloads can be delivered through specially crafted fastboot commands or firmware images. The vulnerability is particularly concerning because fastboot operates with elevated privileges during the boot process, meaning successful exploitation could lead to complete system compromise without requiring user interaction or prior authentication. The attack vector typically involves connecting a device to a computer via USB and executing malicious fastboot commands that trigger the buffer overflow condition.
The operational impact of CVE-2018-5854 extends beyond simple privilege escalation to encompass potential device takeover and persistent malware installation capabilities. Attackers exploiting this vulnerability could gain root access to devices during the bootloader phase, enabling them to modify system firmware, install backdoors, or extract sensitive device information. The affected platforms include numerous Android devices from various manufacturers that rely on Qualcomm's Android for MSM framework, making this vulnerability widespread across the mobile ecosystem. The timing of exploitation is critical as it occurs during the early boot phase when standard security mechanisms may not yet be fully initialized, potentially bypassing traditional runtime protections. This vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which specifically addresses buffer overflows occurring in stack memory regions, and represents a significant concern for the ATT&CK framework's bootkit and rootkit techniques.
Mitigation strategies for CVE-2018-5854 require both immediate firmware updates and operational security measures to protect against exploitation. Device manufacturers should implement comprehensive patching programs that address the specific buffer overflow conditions in fastboot implementations, particularly focusing on input validation and memory management routines. Security teams should disable fastboot functionality when not actively needed and implement strict access controls for fastboot interfaces. Network-based protections such as USB device filtering and monitoring can help detect anomalous fastboot activity that might indicate exploitation attempts. Organizations should also consider implementing device attestation mechanisms that verify bootloader integrity before allowing normal device operation. The vulnerability's nature suggests that attackers could potentially leverage it for persistent access, making continuous monitoring and verification of device integrity essential. Additionally, security professionals should ensure that all fastboot operations are performed in secure environments and that device firmware images are verified through cryptographic signatures before deployment. The remediation process requires careful coordination between device manufacturers, security vendors, and end users to ensure complete protection across all affected platforms while minimizing operational disruption to legitimate fastboot use cases.