CVE-2023-30939 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-2023-30939 represents a critical security flaw within telephony service implementations where a missing permission check creates an avenue for unauthorized information disclosure. This issue specifically affects systems that handle telephony services and demonstrates a fundamental failure in access control mechanisms that should prevent unauthorized data exposure. The vulnerability resides in the telephony service component where proper authorization checks are absent, allowing any local entity to potentially access sensitive telephony-related information without requiring additional privileges or execution rights. The absence of permission validation creates a pathway for information disclosure attacks that could compromise telephony system integrity and confidentiality.
The technical flaw manifests as a lack of proper authorization validation within the telephony service framework, where the system fails to verify whether requesting entities have appropriate permissions to access specific telephony data. This missing permission check represents a violation of the principle of least privilege and demonstrates poor security architecture design. The vulnerability operates at the service level where telephony functions should enforce strict access controls but instead permit broad access to telephony-related information. The flaw does not require additional execution privileges or elevated permissions, making it particularly dangerous as it can be exploited by any local user or process that can interact with the telephony service interface.
The operational impact of this vulnerability extends beyond simple information disclosure, potentially exposing sensitive telephony data including call logs, contact information, session details, and other confidential telephony-related metadata. Attackers could leverage this weakness to gain insights into communication patterns, user behavior, and system configurations that could be used for further exploitation or social engineering attacks. The local nature of the vulnerability means that compromise can occur from within the system itself, potentially allowing attackers who have already gained local access to escalate their information gathering capabilities. This type of vulnerability can significantly weaken overall security posture and create opportunities for more sophisticated attacks that rely on gathered intelligence.
Security mitigations for CVE-2023-30939 should focus on implementing proper permission checking mechanisms within the telephony service framework. Organizations must ensure that all telephony service operations enforce strict access controls and validate user permissions before granting access to sensitive information. This includes implementing role-based access control measures and ensuring that all service interfaces properly validate authorization before returning telephony data. The fix should align with established security frameworks such as the CWE-284 Access Control Weakness category, which specifically addresses insufficient access control mechanisms. Additionally, this vulnerability relates to ATT&CK technique T1083, File and Directory Discovery, as the missing permission check enables unauthorized access to system information. Regular security audits and code reviews should be conducted to identify similar permission bypass vulnerabilities, and system administrators should implement monitoring to detect unauthorized access attempts to telephony service components. The remediation approach should include comprehensive testing of access control mechanisms and validation that all telephony service functions properly enforce authorization requirements.