CVE-2023-30933 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 • 07/30/2023
The vulnerability identified as CVE-2023-30933 resides within telephony service implementations where a critical missing permission check has been discovered. This flaw exists in the core telephony subsystem that manages voice calls, SMS messaging, and related communication services on mobile devices and telephony platforms. The absence of proper authorization verification creates a pathway for unauthorized access to sensitive telephony data that should otherwise be restricted to privileged system components or authorized applications. The vulnerability specifically affects the permission model implementation within telephony services, where the system fails to validate whether incoming requests possess adequate privileges before exposing sensitive information. This missing validation occurs at the service level where telephony data is processed and accessed, making it particularly concerning for mobile operating systems and telephony frameworks that handle confidential user communications.
The technical nature of this vulnerability stems from improper access control mechanisms within the telephony service daemon or framework. When applications or processes attempt to query telephony information such as call logs, contact details, message content, or device identification data, the system should verify that the requesting entity has appropriate permissions before granting access. However, in this case, the permission checking logic is either completely absent or contains a critical flaw that allows any local process to access restricted telephony data without proper authorization. This represents a fundamental breakdown in the principle of least privilege and could be categorized under CWE-284 Access Control Issues, specifically related to insufficient access control validation. The vulnerability operates at the system level where telephony services are exposed through inter-process communication mechanisms, making it possible for malicious applications to exploit this weakness through local execution without requiring additional privileges or root access.
The operational impact of CVE-2023-30933 extends beyond simple information disclosure to potentially compromise user privacy and device security. Attackers could leverage this vulnerability to access sensitive telephony data including call history, SMS messages, phone numbers, and potentially device identifiers that could be used for further exploitation. The local information disclosure could enable adversaries to gather intelligence about user communication patterns, contacts, and device usage that might be valuable for social engineering attacks or targeted malware deployment. This vulnerability particularly affects mobile platforms where telephony services are integral to daily operations and where users expect a certain level of privacy protection. The lack of additional execution privileges required for exploitation means that even non-privileged applications could potentially access sensitive information, making this vulnerability particularly dangerous in environments where multiple applications run with varying permission levels. According to ATT&CK framework, this vulnerability maps to T1083 (File and Directory Discovery) and T1566 (Phishing) as adversaries could use the leaked information to craft more convincing social engineering attacks.
Mitigation strategies for CVE-2023-30933 should focus on implementing robust permission checking mechanisms within telephony service components. System administrators and developers should ensure that all telephony service interfaces properly validate access control before returning sensitive data, implementing proper authentication and authorization checks at every service endpoint. The fix should involve adding comprehensive permission validation logic that verifies the requesting process's identity, privileges, and intended use case before granting access to telephony information. Organizations should also implement monitoring solutions to detect unauthorized access attempts to telephony services and establish regular security audits of telephony service implementations. Additionally, applying the principle of least privilege by ensuring that telephony services only expose necessary functionality and data to authorized processes can help reduce the attack surface. The vulnerability highlights the importance of proper security testing during the development lifecycle, particularly for system services that handle sensitive user data. Regular security assessments and penetration testing of telephony service implementations should be conducted to identify and remediate similar access control weaknesses before they can be exploited by malicious actors.