CVE-2023-33885 in SC9863A
Summary
by MITRE • 07/12/2023
In telephony service, there is a missing permission check. This could lead to local information disclosure with no additional execution privileges needed.
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Analysis
by VulDB Data Team • 08/02/2023
The vulnerability identified as CVE-2023-33885 resides within telephony service implementations where a critical missing permission check has been discovered. This flaw represents a significant security weakness that allows unauthorized local access to sensitive information without requiring any additional execution privileges or elevated permissions. The vulnerability specifically affects systems that handle telephony services and could potentially be exploited by malicious actors who have local access to the device or system. From a cybersecurity perspective, this missing permission check creates an attack surface that violates fundamental security principles of least privilege and access control.
The technical nature of this vulnerability stems from improper authorization validation within the telephony service component. When applications or services attempt to access telephony-related data or functionality, the system should verify that the requesting entity has appropriate permissions before granting access. However, in this case, the permission checking mechanism has been omitted or bypassed entirely, allowing any local process or user to potentially retrieve confidential telephony information. This type of flaw aligns with CWE-284, which specifically addresses improper access control issues, and can be categorized as an authorization bypass vulnerability. The absence of proper permission validation means that sensitive data such as call logs, contact information, device identifiers, or network configuration details could be accessed by unauthorized local entities.
The operational impact of CVE-2023-33885 extends beyond simple information disclosure, as it creates a persistent security risk for systems that rely on telephony services. Local information disclosure can lead to comprehensive data exposure that may include personal identification information, communication patterns, device metadata, and potentially sensitive network configurations. Attackers could leverage this vulnerability to gather intelligence for further attacks, including social engineering campaigns, network reconnaissance, or targeting other system components that may be connected to the telephony service. The low privilege requirement makes this vulnerability particularly dangerous as it can be exploited by any local user or process without requiring administrative rights or specialized attack tools. This aligns with ATT&CK technique T1083, which covers the discovery of system information, and T1005, which addresses data from local system storage.
Mitigation strategies for CVE-2023-33885 should focus on implementing robust access control mechanisms and permission validation throughout the telephony service components. System administrators should ensure that all telephony service interfaces enforce proper authentication and authorization checks before allowing access to sensitive data. The implementation should include comprehensive permission validation for all telephony-related operations, with clear access control policies that define who can access what information and under what circumstances. Regular security audits should be conducted to identify and remediate similar permission checking gaps in other system components. Additionally, organizations should implement monitoring solutions that can detect unauthorized access attempts to telephony services and alert security teams to potential exploitation attempts. The vulnerability highlights the importance of maintaining proper security boundaries and access controls even within local system components where traditional network-based attacks may be less prevalent.