CVE-2023-30679 in Smart Phone
Summary
by MITRE • 08/10/2023
Improper access control in HDCP trustlet prior to SMR Aug-2023 Release 1 allows local attackers to execute arbitrary code.
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Analysis
by VulDB Data Team • 09/05/2023
The vulnerability identified as CVE-2023-30679 represents a critical access control flaw within the High-bandwidth Digital Content Protection trustlet component of a mobile device's security architecture. This issue affects systems prior to the SMR August 2023 Release 1, indicating that the flaw exists in older firmware implementations where proper authorization mechanisms have not been fully enforced. The HDCP trustlet serves as a critical security module responsible for managing digital content protection protocols, particularly in scenarios involving high-definition video transmission and display output. The improper access control vulnerability stems from insufficient validation of privilege levels and authentication requirements within this trustlet environment, creating a pathway for unauthorized code execution.
The technical implementation of this vulnerability allows local attackers who already have access to the device to exploit the weak access control mechanisms within the HDCP trustlet. This flaw typically manifests through improper validation of caller privileges or insufficient sandboxing of trustlet operations, enabling malicious code to bypass normal security boundaries and execute with elevated privileges. The attack vector is classified as local since it requires physical access or pre-existing user-level access to the device, but the impact extends beyond standard user privileges to potentially allow full system compromise. This vulnerability aligns with CWE-284, which addresses improper access control issues, and represents a failure in the principle of least privilege enforcement within the security module. The trustlet environment operates with high privileges to perform cryptographic operations and content protection functions, making any access control bypass particularly dangerous.
The operational impact of CVE-2023-30679 extends significantly beyond simple privilege escalation, as the HDCP trustlet typically handles sensitive cryptographic operations and digital rights management functions. Attackers could potentially exploit this vulnerability to decrypt protected content, modify digital signatures, or manipulate content protection mechanisms that are fundamental to preventing unauthorized copying or distribution of high-definition media. The implications are particularly severe in enterprise environments where devices may be used for handling sensitive corporate data or proprietary content. This vulnerability creates opportunities for attackers to gain persistent access to device functionalities and could enable further exploitation through lateral movement within networked environments. According to ATT&CK framework, this vulnerability maps to T1068 (Local Privilege Escalation) and potentially T1547 (Registry Run Keys) if the trustlet execution environment can be manipulated to establish persistence. The vulnerability also exposes potential for data exfiltration through compromised content protection channels and could undermine trust in the device's overall security architecture.
Mitigation strategies for CVE-2023-30679 primarily focus on firmware updates and system patching to address the specific access control implementation flaws within the HDCP trustlet. Organizations should prioritize immediate deployment of the SMR August 2023 Release 1 or subsequent patches that properly enforce access control boundaries within the trustlet environment. Security monitoring should include detection of unauthorized trustlet execution patterns and unusual cryptographic operations that might indicate exploitation attempts. Device administrators should implement comprehensive access control policies and regularly audit trustlet operations to identify potential unauthorized modifications. The vulnerability highlights the importance of proper security boundary enforcement in trusted execution environments and underscores the need for robust privilege separation mechanisms. Additional mitigations include network segmentation to limit lateral movement opportunities, enhanced logging of trustlet activities, and implementation of runtime integrity checking for critical security modules. Organizations should also consider implementing device enrollment and management solutions that can automatically apply security patches and monitor for vulnerable configurations. The remediation process requires careful consideration of the trustlet's operational dependencies and potential impacts on legitimate content protection functions while ensuring complete elimination of the access control bypass mechanism.