CVE-2023-4280 in Gecko SDK
Summary
by MITRE • 01/02/2024
An unvalidated input in Silicon Labs TrustZone implementation in v4.3.x and earlier of the Gecko SDK allows an attacker to access the trusted region of memory from the untrusted region.
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Analysis
by VulDB Data Team • 06/13/2025
The vulnerability identified as CVE-2023-4280 represents a critical security flaw within the Silicon Labs TrustZone implementation found in the Gecko SDK version 4.3.x and earlier. This issue stems from inadequate input validation mechanisms that permit unauthorized access to protected memory regions, fundamentally undermining the security model designed to isolate trusted and untrusted execution environments. The flaw exists at the core of the secure element architecture where the boundary between trusted and untrusted code domains becomes porous due to insufficient validation of inputs passed between these domains. This vulnerability directly impacts the integrity of the TrustZone security framework by allowing malicious actors to exploit a pathway that should remain strictly protected. The implications extend beyond simple privilege escalation as they represent a fundamental breach in the security isolation that TrustZone is designed to enforce.
The technical implementation of this vulnerability manifests through improper validation of inputs that traverse the boundary between the untrusted application domain and the trusted secure domain within the Gecko SDK. When unvalidated data is processed by the secure element, it can potentially manipulate the execution flow or access memory locations that should only be accessible to trusted code components. This flaw operates at a low level within the system architecture where the separation between secure and non-secure execution contexts becomes compromised. The vulnerability can be exploited through carefully crafted inputs that bypass the normal validation checks implemented within the SDK, allowing attackers to execute code within the trusted region or access sensitive data stored in protected memory spaces. This represents a classic example of a buffer overflow or injection vulnerability that has been specifically designed to target the security boundaries of the TrustZone implementation rather than traditional application-level flaws.
The operational impact of CVE-2023-4280 is severe and multifaceted, affecting any device or system that utilizes the affected Gecko SDK versions in their TrustZone implementations. Attackers can leverage this vulnerability to gain unauthorized access to cryptographic keys, sensitive configuration data, or other protected information stored within the secure memory regions. The ability to execute arbitrary code within the trusted domain creates a persistent threat that could lead to complete system compromise, especially in IoT devices where TrustZone is often used to protect critical security functions. This vulnerability particularly affects embedded systems and IoT devices that rely on Silicon Labs microcontrollers and security modules, potentially enabling attackers to perform man-in-the-middle attacks, decrypt sensitive communications, or even modify firmware components that are supposed to be protected. The threat landscape is further exacerbated by the fact that such vulnerabilities are often difficult to detect during normal operation, making them particularly dangerous in production environments.
Mitigation strategies for CVE-2023-4280 must address both immediate remediation and long-term architectural improvements to prevent similar vulnerabilities from emerging in future implementations. The primary recommendation involves upgrading to the latest version of the Gecko SDK where the input validation issues have been addressed through proper sanitization and validation of all inputs traversing the secure boundary. Organizations should also implement comprehensive code reviews focused on security boundary validation and establish robust testing procedures that specifically target the integrity of TrustZone implementations. Additionally, deployment of runtime monitoring systems that can detect anomalous behavior patterns within secure execution contexts provides an additional layer of defense. From a defensive standpoint, implementing the principle of least privilege within secure domains and ensuring that all inputs are properly validated before processing represents the fundamental approach to addressing this class of vulnerability. The remediation process should also include thorough security assessments of all systems utilizing the affected SDK versions to identify potential exploitation paths and ensure complete mitigation of the threat. This vulnerability highlights the critical importance of maintaining up-to-date security implementations and the necessity of rigorous validation processes in secure element architectures.